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Interfacial engineering of Al-NH4CoF3@P(VDF-HFP)core-shell energetic composites via electrostatic spraying:Enhanced stability and combustion performance 认领 引用
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作者 Xiandie Zhang Zhijie Fan +4 位作者 Heng Xu Jinbin Zou Chongqing Deng Xiang Zhou Xiaode Guo 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期210-223,共14页
Al/NH4CoF3-Φ(Φ=0.5,1.0,1.5,2.0,and 3.0)binary composites and Al-NH4CoF3@P(VDF-HFP)ternary composites are fabricated via ultrasonication-assisted blending and electrostatic spraying.The effect of equivale... Al/NH4CoF3-Φ(Φ=0.5,1.0,1.5,2.0,and 3.0)binary composites and Al-NH4CoF3@P(VDF-HFP)ternary composites are fabricated via ultrasonication-assisted blending and electrostatic spraying.The effect of equivalence ratio(Φ)on the reaction properties is systematically investigated in the binary Al/NH4CoF3system.For ternary systems,electrostatic spraying allows both components to be efficiently encapsulated by P(VDF-HFP)and to achieve structural stabilization and enhanced reactivity through synergistic interfacial interactions.Morphological analysis using SEM/TEM revealed that P(VDF-HFP)formed a protective layer on Al and NH4CoF3particles,improving dispersion,hydrophobicity(water contact angle increased by 80.5%compared to physically mixed composites),and corrosion resistance.Thermal decomposition of NH4CoF3occurred at 265℃,releasing NH3and HF,which triggered exothermic reactions with Al.The ternary composites exhibited a narrowed main reaction temperature range and concentrated heat release,attributed to improved interfacial contact and polymer decomposition.Combustion tests demonstrated that Al-NH4CoF3@P(VDF-HFP)achieved self-sustaining combustion.In addition,a simple validation was done by replacing the Al component in the aluminium-containing propellant,demonstrating its potential application in the propellant field.This work establishes a novel strategy for designing stable,high-energy composites with potential applications in advanced propulsion systems. 展开更多
关键词 Anti-aging properties Low-temperature reaction Electrostatic spraying Gas generation Combustion performance
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The combustion reactivity of core-shell Al/Fluoropolymers and application in RDX-based explosives 认领 引用 被引量：1
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作者 Ting Liu Jian Wang +6 位作者 Jie Chen Cui Nie Yaofeng Mao Fude Nie Ruolei Zhong Wei Cao Jun Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第9期30-39,共10页
Aluminum(Al)powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics.However,the inert oxide layer(Al2O3)on Al particles limits combustion reactivity and ... Aluminum(Al)powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics.However,the inert oxide layer(Al2O3)on Al particles limits combustion reactivity and energy efficiency.Fluoride-based surface modification has been developed as an effective approach to address this issue.Here,four classical fluoropolymers(F11,F14,PVDF,PTFE)are employed as coatings to prepare core-shell Al/Fluoropolymer.The combustion experimental results demonstrate that the core-shell Al/PTFE exhibits the highest flame propagation rate(52.88 mm·ms-1)and pressure output(109.02 k Pa)performance.Consequently,core-shell Al/PTFE is selected as a high-energy fuel to prepare RDX/Al/PTFE microspheres via the emulsion and solvent evaporation method,which can enhance the energy performance of RDX.The effects of the core-shell Al/PTFE ratio and RDX content on the combustion heat and pressure output are systematically investigated.The peak pressure reaches a maximum of 187.8 k Pa when the mass ratio of RDX,Al,and PTFE is 60:25:10.Additionally,RDX/Al/PTFE microspheres exhibit significantly higher laser-induced air shock velocities,detonation heat,and detonation pressure than those of pure RDX and RDX/Al.The mechanism underlying the enhanced reactivity and energetic performance is attributed to the ability of PTFE to etch the inert Al2O3shell on the surface of Al particles,thereby improving post-combustion reactions and significantly increasing the overall energy output of RDX explosives.This work offers a novel design strategy for high-energy structural thermobaric explosives for the practical applications. 展开更多
关键词 Core-shell Al/Fluoropolymers RDX/Al/PTFE Microspheres Combustion reactivity Energetic performance
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3D printed hybrid rocket fuels with μAl core-shell particles coated with polyvinylidene fluoride and polydopamine: Enhanced combustion characteristics 认领 引用 被引量：2
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作者 Qihang Chen Xiaolong Fu +6 位作者 Weitao Yang Suhang Chen Zhiming Guo Rui Hu Huijie Zhang Lianpeng Cui Xu Xia 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第4期59-70,共12页
3D printing technology enhances the combustion characteristics of hybrid rocket fuels by enabling complex geometries. However, improvements in regression rates and energy properties of monotonous 3D printed fuels have... 3D printing technology enhances the combustion characteristics of hybrid rocket fuels by enabling complex geometries. However, improvements in regression rates and energy properties of monotonous 3D printed fuels have been limited. This study explores the impact of poly(vinylidene fluoride) and polydopamine-coated aluminum particles on the thermal and combustion properties of 3D printed hybrid rocket fuels. Physical self-assembly and anti-solvent methods were employed for constructing composite μAl particles. Characterization using SEM, XRD, XPS, FTIR, and μCT revealed a core-shell structure and homogeneous elemental distribution. Thermal analysis showed that PVDF coatings significantly increased the heat of combustion for aluminum particles, with maximum enhancement observed in μAl@PDA@PVDF(denoted as μAl@PF) at 6.20 k J/g. Subsequently, 3D printed fuels with varying pure and composite μAl particle contents were prepared using 3D printing. Combustion tests indicated higher regression rates for Al@PF/Resin composites compared to pure resin, positively correlating with particle content. The fluorocarbon-alumina reaction during the combustion stage intensified Al particle combustion, reducing residue size. A comprehensive model based on experiments provides insights into the combustion process of PDA and PVDF-coated droplets. This study advances the design of 3D-printed hybrid rocket fuels, offering strategies to improve regression rates and energy release, crucial for enhancing solid fuel performance for hybrid propulsion. 展开更多
关键词 Hybrid propulsion Regression rate 3D print fuels Micro aluminum Core-shell mAl@PDA@PVDF
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High-pressure micro-mix combustion characteristics of hydrogen-oxygen-steam with regenerative cooling 认领 引用
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作者 Xiangnan CHEN Yong TANG +3 位作者 Shiqin XIE Wenxiong XI Dingjiang XIE Baolu SHI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期265-280,共16页
The hydrogen–oxygen-steam gas turbine system embodies a promising pathway toward zero-emission technology.The inherent challenges of flashback and ablation associated with hydrogen fuel and high-oxygen-concentration ... The hydrogen–oxygen-steam gas turbine system embodies a promising pathway toward zero-emission technology.The inherent challenges of flashback and ablation associated with hydrogen fuel and high-oxygen-concentration flames have steered current hydrogen turbine advancements toward micro-mix combustion technology.To meet the experimental demands for hydrogen–oxygen micro-mix high-pressure combustion under steam dilution,this study utilized 3D printing technology for the fabrication of the combustion chamber,and developed an innovative experimental technique utilizing throat pressure buildup and regenerative cooling for steam generation.The system is capable of accommodating hydrogen–oxygen-steam micro-mix highpressure(0.3–1 MPa)combustion testing across a power spectrum of 5.40–10.80 kW,with pressure fluctuation below 0.01 MPa during stable combustion stage.Regenerative cooling and steam dilution can substantially lower the maximum temperature of hydrogen–oxygen flame even at high pressure near 1 MPa,thus offering a viable means to achieve hydrogen–oxygen combustion in gas turbines.By integrating wall-mounted temperature sensors,combustion chamber pressure monitoring,and infrared thermographic imaging,comprehensive data on combustion chamber wall temperatures,combustion pressures,and qualitative steam temperature fields at the outlet were systematically acquired.The combustion efficiency was evaluated through combustion temperature and pressure metrics.The findings demonstrate that the initial temperature within the combustion chamber and the structure of micro-mixing injection exert a considerable influence on combustion efficiency,whereas the impact of combustion chamber pressure is marginal.In particular,the cross-jet injection technique augments combustion efficiency by 6%–8% in contrast to the axialtangential swirl approach.Moreover,an elevation in the initial temperature of the combustion chamber from 100℃ to 300℃ results in a 4%improvement in combustion efficiency.Thus,a novel integrated system combining 3D-printed combustion chambers with regenerative steam cooling for high-pressure hydrogen–oxygen combustion studies was developed.This technology may provide experimental validation and design guidelines for next-generation hydrogen gas turbine development. 展开更多
关键词 Combustion efficiency Gas turbines High-pressure combustion Micro-mix combustion Regenerative cooling
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Enhanced SO2resistance of the Pd/Silicate-1 catalyst by rare earth oxide modification in methane combustion 认领 引用
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作者 Jinxiong Tao Hongxia Lin +8 位作者 Yuxi Liu Jiguang Deng Lin Jing Zhiwei Wang Lu Wei Zhen Wei Zhiquan Hou Zexu Zhang Hongxing Dai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期647-657,共11页
The inherent irreducibility and limited sulfur dioxide tolerance of zeolites constrain oxygen exchange efficiency in palladium/zeolite catalysts,which can adversely affect their performance in methane combustion.Herei... The inherent irreducibility and limited sulfur dioxide tolerance of zeolites constrain oxygen exchange efficiency in palladium/zeolite catalysts,which can adversely affect their performance in methane combustion.Herein,a novel molecular sieve(Silicate-1,denoted as S-1)catalyst functionalized with rare earth oxide sites was developed for catalytic methane combustion.Although both Pd/S-1@CeO2-30(in which CeO2content was 30 wt.%)and Pd/S-1 catalysts demonstrated comparable initial catalytic activities,the Pd/S-1@CeO2-30 sample achieved a methane reaction rate of 114.0μmol/(gPd·s)and the highest TOFPd(0.033s-1),with a 90%methane conversion at 424℃ at a space velocity of 20,000 mL/(g h).The CeO2shell in Pd/S-1@CeO2-30 exhibited the superior longterm stability that was attributed to the redox property of CeO2,which could facilitate the provision of abundant oxygen species.As a result,the Pd/S-1@CeO2-30 catalyst maintained stable performance in 10,000-ppm CH4methane combustion at 400℃ and retained a high CH4conversion efficiency even under exposure to 50 ppm SO2.Similarly,Ce0.6Zr0.4O2or Sm2O3shell also demonstrated comparable SO2resistance.Detailed characterization results revealed that CeO2acted as an exceptional redox center,significantly enhanced SO2adsorption,and effectively inhibited the poisoning of the active PdO sites by SO2,leading to a notable improvement in sulfur dioxide tolerance.These findings highlighted the critical role of the core-shell structure in enhancing catalyst resistance to SO2poisoning during methane combustion.The present work provides valuable insights into the appropriate designing of advanced core-shell catalysts with improved durability and performance in the sulfur dioxide-containing environments. 展开更多
关键词 Methane combustion,core-shell structure Rare earth oxide modification Sulicate-1-supported pd catalyst SO2resistance
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Core-shell Pd@CeO2/γ-Al2O3 catalysts:Boosting efficiency and durability in stoichiometric natural gas vehicle exhaust treatment 认领 引用
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作者 Run Pan Abubakar Yusuf +10 位作者 Chengjun Wang Jianrong Li Zhiyu Xiao Shuai Liu Yidong Zhong Yong Ren Zheng Wang Hainam Do John L.Zhou George Zheng Chen Jun He 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第3期348-362,共15页
Natural gas vehicles(NGVs)offer significant environmental advantages by reducing pollutant emissions,but effective exhaust treatment remains a challenge due to high methane emissions and catalyst deactivation over tim... Natural gas vehicles(NGVs)offer significant environmental advantages by reducing pollutant emissions,but effective exhaust treatment remains a challenge due to high methane emissions and catalyst deactivation over time.This study introduces a core-shell Pd@CeO2/Al2O3 three-way catalyst(TWC)designed to enhance the efficiency and durability of NGV exhaust treatment.The core-shell structure significantly improves catalytic performance.The optimized Pd@Ce/Al(S-500)catalyst demonstrates excellent low-temperature activity,with T50 values of 336℃ for CH4 and 397℃ for NO.It also achieves remarkable reductions of 113 and 177℃ in the T90 for CH4 and NO conversion,respectively,compared to the non-core-shell counterpart,Pd-Ce/Al(S-500).Characterizations reveal enhanced metal-support interactions,increased oxygen vacancies,and optimized Pd-CeO2 interfaces as key active sites.Density functional theory calculations further demonstrate that the core-shell structure facilitates electron transfer at Pd-CeO2 interfaces and lowers energy barriers for three-way reactions,enhancing catalytic efficiency.Notably,the core-shell Pd@Ce/Al(S-500)catalyst maintains high conversion efficiency for CH4 and NO,with only slight losses(5.5% and 6.6%,respectively)over a 100-h time-on-stream stability test,following 16 h of harsh hydrothermal aging at 800℃,showcasing its long-term stability.These findings provide a deeper understanding of the role of the core-shell Pd@CeO2 structure in Pd-based TWCs and offer valuable insights for designing durable and efficient catalysts to meet the stringent emission standards of NGVs. 展开更多
关键词 Core-shell catalyst Pd@CeO2/Al2O3 Natural gas vehicles Stoichiometric combustion Three-way catalysis Hydrothermal stability
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Impact of CeO2 and GO on the combustion performance of HANbased electrically controlled solid propellant 认领 引用
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作者 Lian Li Lirong Bao +8 位作者 Zhiwen Wang Feng Li Lai Jiang Chuntian Li Zhidong Wang Yinghua Ye Ruiqi Shen Luigi De Luca Wei Zhang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第2期160-171,共12页
Electrically controlled solid propellant(ECSP)offers multiple ignition and adjustable burning rate,serving as fuel for next-generation intelligent propulsion systems.To further enhance the combustion performance of EC... Electrically controlled solid propellant(ECSP)offers multiple ignition and adjustable burning rate,serving as fuel for next-generation intelligent propulsion systems.To further enhance the combustion performance of ECSP,a method utilizing electrochemical and thermal decomposition catalysts has been proposed.In this work,we investigated the combustion characteristics of hydroxylamine nitrate(HAN)-based ECSP incorporating cerium oxide(CeO2)and graphene oxide(GO)by using an electrically controlled combustion test system.Electrochemical impedance spectroscopy(EIS)and linear sweep voltammetry(LSV)were used to measure the electrical conductibility and overpotential of ECSP with various additives,and Tafel curves were calculated.Thermogravimetric analysis coupled with differential scanning calorimetry(TG-DSC)was employed to investigate the thermal decomposition behavior of ECSP.While the addition of CeO2 and GO reduced the conductivity of ECSP,both catalysts exhibited strong electrocatalytic properties and facilitated the thermal decomposition of ECSP.Between two catalysts,GO demonstrated superior electrochemical catalytic performance but weaker thermal decomposition catalytic ability than CeO2.The addition of catalysts significantly enhanced the combustion performance of HAN-based ECSP.Specifically,the ignition delay time was shortened by 10%~20%.CeO2 raised the burning rate by approximately 20%but GO exhibited a remarkable boost of 40%in burning rate at high voltage.The combination of GO and PVA produced a flame-retardant substance that negatively impacted the ignition delay of ECSP and resulted in a smaller increase in the burning rate of ECSP at low ignition voltages. 展开更多
关键词 Electrically controlled solid propellant Hydroxylamine nitrate Controllable combustion Electrothermal combustion mechanism
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Ammonia thermal atmosphere compression ignition engine:Stable combustion mechanism and intake control strategy 认领 引用
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作者 Rui Yang Shouzhen Zhang +5 位作者 Jiuling Sun Zongyu Yue Hu Wang Leilei Xu Xue-Song Bai Mingfa Yao 《ENGINEERING Energy》 SCIE EI CAS CSCD 2026年第2期75-90,共16页
Ammonia is a promising carbon-free fuel for internal combustion engines(ICEs).However,existing research has not yet provided satisfactory solutions for ammonia combustion,a crucial gap that significantly limits its pr... Ammonia is a promising carbon-free fuel for internal combustion engines(ICEs).However,existing research has not yet provided satisfactory solutions for ammonia combustion,a crucial gap that significantly limits its practical application.In this study,ammonia thermal atmosphere compression ignition(TACI)combustion mode was proposed as a promising solution to achieve efficient and clean ammonia diffusion combustion in ICEs.This study investigates the stable combustion mechanism of ammonia spray,the formation characteristics of nitrogen oxides,and the greenhouse gas(GHG)reduction potential of the ammonia TACI combustion mode.Experimental results of the TACI mode demonstrate high thermal efficiency,low NOx emissions,ultra-low N2O emissions,and negligible unburned ammonia slip.Intake control strategies,including intake pressure and intake temperature,are explored to further improve the ammonia substitution ratio(ASR)and GHG reduction performance.Intake air heating significantly improves the ASR,but must be coupled with high intake pressure to ensure sufficient oxygen supply.The combined strategy of intake air heating and high intake pressure increases the ASR by 17%and the GHG reduction ratio by 9%.Under medium-load conditions,this approach achieves an ASR over 80%and GHG reduction exceeding 70%,meeting the International Maritime Organization(IMO)2040 GHG reduction target. 展开更多
关键词 Thermal atmosphere compression ignition Ammonia diffusion combustion Intake control strategy Carbon reduction Internal combustion engine
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A Review on Liquid-Ammonia Injection and Combustion for Engine Applications 认领 引用
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作者 Hao Wu Fahad Almatrafi +2 位作者 Moez Ben Houidi Tiegang Fang William L.Roberts 《Engineering》 SCIE EI CSCD 2026年第4期82-117,共36页
This comprehensive review examines the application of liquid-ammonia injection and combustion in engine systems,highlighting the potential of liquid ammonia as a carbon-neutral fuel alternative.The study synthesizes r... This comprehensive review examines the application of liquid-ammonia injection and combustion in engine systems,highlighting the potential of liquid ammonia as a carbon-neutral fuel alternative.The study synthesizes recent advancements in liquid-ammonia injection and combustion technologies,addressing critical domains such as fundamental fuel properties,injection and spray dynamics,combustion behavior,and engine performance.Key challenges are identified,including ammonia’s high latent heat of vaporization,slow flame-propagation speed,narrow flammability range,and elevated NOxemissions,while emphasizing the need for optimized injection strategies and nozzle designs to enhance atomization and mixing.The research findings indicate that liquid-ammonia injection can significantly reduce greenhouse gas emissions,with dual-fuel modes(e.g.,ammonia-diesel)proving effective in overcoming ammonia’s low reactivity.Studies show that both low-pressure and high-pressure dual fuel-injection modes can achieve substantial emission reductions,with high-pressure injections offering better thermal efficiency and lower NOxemissions.Innovative approaches,such as turbulent jet ignition,stratified fuel injection,and hydrogen co-injection,have been explored to improve ignition efficiency and combustion stability.Future research should prioritize the development of integrated solutions that combine advanced combustion technologies,optimized engine designs,and effective emission-control strategies.Collaboration between academia,industry,and policymakers will be crucial in driving the adoption of ammonia as a sustainable fuel alternative. 展开更多
关键词 Liquid ammonia Flash-boiling spray Alternative fuels Dual-fuel combustion Internal-combustion engines
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Data-driven neural surrogates for ReaxFF molecular dynamics simulations in engine-relevant combustion chemistry 认领 引用
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作者 Yuchao YAN Qiao HUANG +1 位作者 Tianfang XIE Jinlong LIU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第8期825-836,I0015,共12页
Machine learning(ML)has gained significant traction in engine-related research,particularly because of its potential to improve predictive performance while reducing computational costs.However,most current applicatio... Machine learning(ML)has gained significant traction in engine-related research,particularly because of its potential to improve predictive performance while reducing computational costs.However,most current applications rely on feedforward neural networks(FNNs;e.g.,conventional artificial neural networks(ANNs));these are well-suited for modeling static data and capturing nonlinear relationships,but do not explicitly encode temporal dependencies unless sequence context is introduced via feature engineering.Motivated by this limitation,we evaluate sequence-aware neural surrogates for engine-relevant combustion-chemistry time-series data.Specifically,the temporal evolution of an intermediate product group during polycyclic aromatic hydrocarbon(PAH)formation in C2H4/NH3 pyrolysis is modeled using reactive force field(ReaxFF)molecular dynamics(MD)trajectories,comparing an FNN baseline(with explicit time as an input)against a long short-term memory(LSTM)-based recurrent neural network(RNN).The results show that while the FNN baseline benefits from explicit temporal feature engineering,its predictive performance is inferior to that of the LSTM model,even when the network depth is increased.This behavior is consistent with the architectural limitations of feedforward models,which do not maintain an internal memory state,and therefore,tend to generalize poorly when the target dynamics are history dependent.In contrast,the LSTM model leverages gated memory to learn temporal dependencies and consequently improves the predictive accuracy of combustion-chemistry time-series modeling,providing an efficient surrogate once trained.Overall,our findings delineate the conditions under which sequence-aware recurrent architectures offer advantages over feedforward models for ReaxFF MD time-series surrogate modeling. 展开更多
关键词 Feedforward neural network(FNN) Recurrent neural network(RNN) reactive force field molecular dynamics(ReaxFF MD) Combustion-chemistry surrogate Internal combustion engine
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Multi-scale coherent interfaces in core-shell Sr0.875La0.1TiO3-based textured ceramics for enhanced high temperature thermoelectric performance 认领 引用 被引量：1
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作者 Zhihao Lou Ziyao Wei +4 位作者 Xiaoyu Xu Ping Zhang Jingji Zhang Jie Xu Feng Gao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期279-289,I0007,共11页
SrTiO3-based thermoelectric ceramics show potential for high-temperature energy harvesting but face challenges from inefficient carrier transport and high thermal conductivity.This work presents a multi-scale struc... SrTiO3-based thermoelectric ceramics show potential for high-temperature energy harvesting but face challenges from inefficient carrier transport and high thermal conductivity.This work presents a multi-scale structural engineering strategy to address these challenges,fabricating textured Sr0.875La0.1Ti O3m Ti/10 wt%Bi2O3(SLTTB)ceramics via plate-like SrTiO3templates.Through this design,the ceramics form a unique core-shell architecture,where template seeds act as growth cores for epitaxially alignedoriented grains,forming coherent interfaces with a precipitate-rich interlayer and a precipitate-free shell.In the interlayer,uniformly distributed“peanut-shaped”Bi-Ti_nO2n-1nanoparticle pairs enhance electron mobility and phonon scattering.The hierarchical microstructure creates multiscale coherent interfaces that reduce electron grain boundary scattering,enabling preferential electron transport pathways parallel to the casting direction.This architecture enables the decoupling of electrical and thermal properties,with a power factor reaching 1815μW/m/K2at 1073 K with thermal conductivity suppressed by interfacial and nanoparticle scattering.Consequently,the SLTTB textured ceramic achieves a notable ZT of 0.64 at 1073 K,a significant enhancement over conventional counterparts.This work demonstrates a multi-scale structural strategy integrating template-induced texture,core-shell design,and nanoscale interface modulation to decouple the electrical and thermal properties of SrTiO3-based materials,and provides a roadmap for tailoring the electrical-thermal transport properties of thermoelectric textured ceramics. 展开更多
关键词 Strontium titanate Thermoelectrics Textured ceramics Core-shell architecture Coherent interfaces
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The interface engineering strategy assists the 3D core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres to achieve significant overall water splitting 认领 引用 被引量：3
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作者 Jun Yu Yangping Zhang +6 位作者 Nannan Zhang Jie Li Huiyu Sun Xinyu Gu Changqing Ye Tianpeng Liu Yukou Du 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期570-576,共7页
Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral ... Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres electrocatalyst was constructed on nickel foam(NF)via an interfacial engineering strategy.This 3D core-shell heterostructure maximizes the exposure of active sites,optimizes the charge transport pathway and accelerates gas release rates.The protective shell strategy of NiFe LDH provides favorable stability,which contributes to inhibiting the electrochemical corrosion of the electrocatalyst and mitigating the toxic effects of Cl- and other microorganisms during the seawater splitting process.Moreover,the introduction of NiFe LDH induces a change in the OER mechanism from an adsorption evolution mechanism(AEM)to a lattice oxygen mechanism(LOM),which improves the intrinsic activity of the catalyst.Consequently,Co3S4/CuS@NiFe LDH demonstrates exceptional performance in the oxygen evolution reaction(OER)(η100=251 mV)and in the hydrogen evolution reaction(HER)(η100=254 mV),alongside remarkable stability over 100 h.For OWS,it exhibits a voltage of 1.46 V at 10 mA/cm2 and maintain stability for 100 h.Impressively,Co3S4/CuS@NiFe LDH still possesses outstanding activity and stability in natural alkaline seawater.This work proposes interfacial engineering to construct bifunctional catalysts with core-shell heterostructures,providing instructive guidelines for the design of highly efficient electrocatalysts toward seawater electrolysis. 展开更多
关键词 Core-shell structure Layered double hydroxides Transition metal sulphides Bifunctional catalyst Overall water splitting Overall seawater splitting
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Effect of Al-Li alloy with various Li content on the energy and combustion performance of HTPB propellant 认领 引用 被引量：1
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作者 Weiqiang Xiong Yunjie Liu +3 位作者 Tianfu Zhang Dawen Zeng Xiang Guo Aimin Pang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期30-39,共10页
In composite solid propellants with high aluminum(Al)content and low burning rate,incomplete combustion of the Al powder may occur.In this study,varying lithium(Li)content in Al-Li alloy powder was utilized instead of... In composite solid propellants with high aluminum(Al)content and low burning rate,incomplete combustion of the Al powder may occur.In this study,varying lithium(Li)content in Al-Li alloy powder was utilized instead of pure aluminum particles to mitigate agglomeration and enhance the combustion efficiency of solid propellants(Combustion efficiency herein refers to the completeness of metallic fuel oxidation,quantified as the ratio of actual-to-theoretical energy released during combustion)with high Al content and low burning rates.The impact of Al-Li alloy with different Li contents on combustion and agglomeration of solid propellant was investigated using explosion heat,combustion heat,differential thermal analysis(DTA),thermos-gravimetric analysis(TG),dynamic high-pressure combustion test,ignition experiment of small solid rocket motor(SRM)tests,condensation combustion product collection,and X-ray diffraction techniques(XRD).Compared with pure Al,Al-Li alloys exhibit higher combustion heat,which contributes to improved combustion efficiency in Al-Li alloy-containing propellants.DTA and TG analyses demonstrated higher reactivity and lower ignition temperatures for Al-Li alloys.High-pressure combustion experiments at 5 MPa showed that Al-Li alloy fuel significantly decreases combustion agglomeration.The results from theφ75 mm andφ165 mm SRM and XRD tests further support this finding.This study provides novel insights into the combustion and agglomeration behaviors of high-Al,low-burning-rate composite solid propellants and supports the potential application of Al-Li alloys in advanced propellant formulations. 展开更多
关键词 Al-Li alloy Combustion and energy performance Agglomeration
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Characteristics and genomic mechanism of Absidia spinosa in inhibiting coal spontaneous combustion 认领 引用 被引量：1
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作者 Xuanmeng Dong Botao Qin +3 位作者 Fusheng Wang Xiangming Hu Liwen Guo Tiesheng Han 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期57-78,共22页
Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention.... Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention.A filamentous fungus was collected in the coal mine and identified as Absidia spinosa.Results indicated that the mycelium effectively covered and repaired many coal pores.The oxygen consumption ratio of A.spinosa was higher in coal-containing environments than in coal-free conditions.The fungus significantly impacted aliphatic functional groups,disrupting bridging bonds and side chains connected to aromatic structures and reducing the relative content of C—O bonds.Additionally,A.spinosa increases the ignition temperature by 25.34℃.The total heat release was decreased by approximately 32.58%,and the activation energies were increased.The genome of Absidia spinosa revealed genes related to oxygen consumption,small molecule degradation,and secretion of metabolic products,such as those annotated under GO ID:0140657,etc.The pathways involved in the degradation of small organic molecules(e.g.,ko00626,etc.),carbon fixation,and nitrogen cycling,all linked to coal decomposition.Through oxygen consumption and the alteration of coal-active structures,A.spinosa effectively inhibits CSC,providing an experimental basis for exploring eco-friendly biological control methods in the goaf. 展开更多
关键词 Coal spontaneous combustion Microorganisms Low-temperature oxidation Aerobic respiration Genomic mechanism
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Utilizing bypass airflow to promote the cavity-based scramjet combustion 认领 引用
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作者 Wenbin LIAO Zhiqiang SHENG +3 位作者 Yu DAN Liangze LU Xin XIANG Xiaoan HU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期328-343,共16页
The design principle of the cavity-based scramjet combustor is to maximize combustion efficiency while minimizing total pressure loss.An experimental cavity-based scramjet was used as TypeⅠ-1,while TypeⅡ-1 was deriv... The design principle of the cavity-based scramjet combustor is to maximize combustion efficiency while minimizing total pressure loss.An experimental cavity-based scramjet was used as TypeⅠ-1,while TypeⅡ-1 was derived by replacing it with a periodic combustor with evenly distributed fuel nozzles.Introducing a bypass channel resulted in TypesⅠ-2 andⅡ-2,whereas arranging wedges and ramps in TypeⅡ-1 led to TypesⅡ-3 andⅡ-4,respectively.Supersonic combustions in these six configurations were studied using three-dimensional numerical simulations.The results showed that combustion efficiency at the outlet increased by 22.77%in TypeⅠ-2 compared with TypeⅠ-1,whereas TypesⅡ-2,Ⅱ-3,andⅡ-4 increased by 18.32%,12.31%,and-6.94%,respectively,compared with TypeⅡ-1.Regarding total pressure loss at the outlet,TypeⅠ-2 decreased by 1.14%compared with TypeⅠ-1,whereas TypesⅡ-2,Ⅱ-3,andⅡ-4 decreased by 2.42%,1.46%,and 0.4%,respectively,compared with TypeⅡ-1.The findings indicate that increasing the upstream low-speed zone,redirecting upstream airflow,and isolating airflow impact can increase the fuel jet's Penetration Height(PH).TypeⅠ-2 significantly increased PH through a bypass channel,whereas TypeⅡ-3 reduced the obstruction of the fuel jets to the airflow entering the cavity through wedges,allowing oxygen-rich airflow into the cavity and maintaining combustion at the lower boundary of the fuel jets.TypesⅠ-2 andⅡ-2 achieved significant bypass airflow,establishing a combustion zone near the wall downstream of the cavity and significantly reducing the temperature of the wall downstream.The results confirm that using bypass airflow to promote cavity-based scramjet combustion is a feasible approach.The shock wave structure in the scramjet combustor remains the primary contributor to total pressure loss,highlighting the importance of designing scramjet combustors with weaker shock waves. 展开更多
关键词 Scramjet combustion Cavity Bypass airflow Combustion efficiency Total pressure loss
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Combined Fault Tree Analysis and Bayesian Network for Reliability Assessment of Marine Internal Combustion Engine 认领 引用 被引量：1
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作者 Ivana Jovanović Çağlar Karatuğ +1 位作者 Maja Perčić Nikola Vladimir 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第1期239-258,共20页
This paper investigates the reliability of internal marine combustion engines using an integrated approach that combines Fault Tree Analysis(FTA)and Bayesian Networks(BN).FTA provides a structured,top-down method for ... This paper investigates the reliability of internal marine combustion engines using an integrated approach that combines Fault Tree Analysis(FTA)and Bayesian Networks(BN).FTA provides a structured,top-down method for identifying critical failure modes and their root causes,while BN introduces flexibility in probabilistic reasoning,enabling dynamic updates based on new evidence.This dual methodology overcomes the limitations of static FTA models,offering a comprehensive framework for system reliability analysis.Critical failures,including External Leakage(ELU),Failure to Start(FTS),and Overheating(OHE),were identified as key risks.By incorporating redundancy into high-risk components such as pumps and batteries,the likelihood of these failures was significantly reduced.For instance,redundant pumps reduced the probability of ELU by 31.88%,while additional batteries decreased the occurrence of FTS by 36.45%.The results underscore the practical benefits of combining FTA and BN for enhancing system reliability,particularly in maritime applications where operational safety and efficiency are critical.This research provides valuable insights for maintenance planning and highlights the importance of redundancy in critical systems,especially as the industry transitions toward more autonomous vessels. 展开更多
关键词 Fault tree analysis Bayesian network Reliability Redundancy Internal combustion engine
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Machine Learning Driven ReaxFF Optimization for Combustion 认领 引用
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作者 Yueqian Sun Shuwen Zhang +1 位作者 John Z.H.Zhang Tong Zhu 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第2期233-244,I0072-I0073,I0170,共12页
Accurate simulation of combus-tion reactions is crucial for un-derstanding combustion mecha-nisms.Reactive force fields(ReaxFF)offer a computation-ally efficient approach to simu-lating complex combustion pro-cesses,b... Accurate simulation of combus-tion reactions is crucial for un-derstanding combustion mecha-nisms.Reactive force fields(ReaxFF)offer a computation-ally efficient approach to simu-lating complex combustion pro-cesses,but their accuracy de-pends critically on parameteri-zation.This work presents a comprehensive optimization of ReaxFF parameters for gas-phase combustion reactions using a machine learning driven ap-proach.We constructed a dataset of 33 reactions,encompassing key reaction types in combus-tion.High-level double hybrid DFT calculations served as a benchmark to evaluate the per-formance of various density functionals,the semi-empirical PM7 method,and existing ReaxFF parameter sets.We then employed the JAX-ReaxFF framework to optimize the CHO2008 parameters,leveraging its efficient local gradient-based optimization algorithms.The optimized ReaxFF significantly improved the accuracy of potential energy and atomic force predictions,with the mean absolute error(MAE)for energy approaching that of PM7.Analysis of reaction pathways and potential energy surfaces further demonstrated the en-hanced performance of the optimized force field,particularly near transition states.This opti-mized ReaxFF provides a good tool for simulating a wide range of combustion systems,and the presented methodology offers a general strategy for developing system-specific ReaxFF parameters. 展开更多
关键词 Combustion chemistry ReaxFF optimization Methane combustion Dodecane pyrolysis Soot particle growth
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Numerical Investigation of Combustion in a Gaseous Bipropellant Rocket Engine 认领 引用
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作者 Giuseppina Persico Francesco Marciano +2 位作者 Sergio Cassese Stefano Mungiguerra Raffaele Savino 《Fluid Dynamics & Materials Processing》 EI 2026年第6期24-47,共24页
Bipropellant rocket engines remain central to space exploration and the advancement of propulsion technology,offering the high performance and operational flexibility required for both launch vehicles and in-space app... Bipropellant rocket engines remain central to space exploration and the advancement of propulsion technology,offering the high performance and operational flexibility required for both launch vehicles and in-space applications.The growing shift toward sustainable,environmentally friendly propellants has intensified research into the precise modeling and understanding of combustion processes.In this scenario,small-scale rocket engines have proven to be indispensable research tools,providing cost-effective and adaptable platforms to investigate complex combustion phenomena and injector configurations while maintaining the fundamental physical characteristics of full-scale systems.Within this scope,a modular 200N-class bipropellant rocket engine platform,utilizing gaseous oxygen and methane as its baseline propellants,has been designed,developed,and manufactured.To characterize the internal combustion dynamics of this system,an extensive numerical campaign was performed.A three-dimensional Reynolds-Averaged Navier-Stokes(RANS)Computational Fluid Dynamics(CFD)model,employing a non-premixed flamelet formulation and the Shear Stress Transport(SST)turbulence model,was developed and subsequently validated against established reference data from the literature.The simulation results demonstrate strong agreement with existing studies regarding global performance parameters and primary combustion features.This validated 3D framework was then implemented as the primary numerical tool for analyzing the combustion process within the 200N-class engine.Specifically,the influence of injector design was examined while maintaining a constant chamber geometry,enabling a detailed evaluation of how propellant mixing affects flame structure,thermal distribution,and overall engine efficiency.The findings confirm that high-fidelity 3D simulations are not only essential for model validation but are also critical for conducting the detailed flow analysis and performance trend assessments required to optimize small-scale bipropellant propulsion systems. 展开更多
关键词 Liquid bipropellant propulsion Oxygen-Methane rocket engine combustion simulations CFD turbulent non-premixed combustion RANS modeling
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Controlled encapsulation of solid particles in core-shell capsules by millifluidics and assisted by vibrations 认领 引用
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作者 Canghai Luo Chao Wu +8 位作者 Baoling Guo Yuan Zheng Ze Yang Xiaoying Ji Jianpeng Sheng Jian Ruan Peng Zhao Dongliang Li Dong Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第7期596-600,共5页
Core-shell capsules are excellent carriers,showing good performances in cargo protection and controlled release.However,the controlled encapsulation of solid particles in capsules remains a great challenge,severely li... Core-shell capsules are excellent carriers,showing good performances in cargo protection and controlled release.However,the controlled encapsulation of solid particles in capsules remains a great challenge,severely limiting their widespread applications.Here,a millifluidic system assisted by periodic vibrations is developed to precisely control the preparation of particle-loaded capsules.A high-frequency lowamplitude vibration is applied to prevent the jamming of solid particles by shaking and a low-frequency high-amplitude vibration is applied to synchronize the feeding of solid particles and the emulsification of capsules by generating a periodic flow pulse.The phase diagrams of particle-loaded capsules are systematically investigated with respect to various experimental parameters to provide guidances for the controlled preparation process.The developed millifluidic system offers a versatile platform to precisely prepare core-shell capsules loaded with different sizes,types and numbers of particles.The prepared particle-loaded capsules possess good biocompatibility,monodispersity,mechanical strength,storage stability and controlled release,paving the way for their widespread applications. 展开更多
关键词 Capsule Core-shell Millifluidics Encapsulation Vibration-assisted
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Ultra-low Pt core-shell electrocatalysts:Noble metal core from irregular binarity to structure-shape-selectivity multielement 认领 引用
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作者 Xuemei Wang Tianlai Hou +4 位作者 Xin Ba Ruixin Wang Haiping Xu Songrui Wang Fanpeng Kong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期298-316,I0008,共19页
Highly efficient low-Pt loading electrocatalysts towards oxygen reduction reaction(ORR)is urgent for advanced membrane electrode assemblies(MEA),directly determining the deployment of low-temperature fuel cells.For OR... Highly efficient low-Pt loading electrocatalysts towards oxygen reduction reaction(ORR)is urgent for advanced membrane electrode assemblies(MEA),directly determining the deployment of low-temperature fuel cells.For ORR,only exposed Pt atoms catalyze molecular oxygen reduction into water,signifying that interior Pt atoms are theoretically replaced by cheaper metals.Core-shell structure is well-known as an ideal model to solve this challenge where Pt atoms mainly locate at the(near-)surface region.Additionally,interior core presents a promising promoter role towards d-band center of Pt shell by short-range ligand effect and long-range strain effect,both which is affected by their large difference in electronegativity and lattice mismatch,respectively.Therefore,the adsorption energy of oxygenated species on Pt shell surface is theoretically optimized by well-designed core structure.In this review,the development of low Pt loading core-shell electrocatalysts is systematically summarized.The effect of composition,shape,element distribution and anisotropy on performance and corresponding enhancement mechanism is also discussed in depth.This review provides an encouraging guideline to fabricate high-performance low-Pt loading core-shell electrocatalysts. 展开更多
关键词 Oxygen reduction Core-shell Strain structure Electronic effect
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