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Facile construction of VS2@GNSs composites with 1D/2D hierarchical structures for efficient electromagnetic wave absorption 认领 引用
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作者 Jia Zhao Jiahuan Liu +2 位作者 Yongqiang Guo Yueqi Yu Junwei Gu 《Science China Materials》 SCIE EI CAS CSCD 2026年第8期4912-4923,共12页
With the extensive production of current multifarious electronic devices,corresponding electromagnetic pollution issues have been increasingly exacerbated.In response to these challenges,herein,VS2 nanorods were un... With the extensive production of current multifarious electronic devices,corresponding electromagnetic pollution issues have been increasingly exacerbated.In response to these challenges,herein,VS2 nanorods were uniformly grafted on graphene nanosheets(GNSs)fabricated through a facile ball milling method to construct 1D/2D hierarchical VS2@GNSs composites with terrific electromagnetic wave(EMW)absorption properties.Specifically,the minimal reflection loss(RLmin)of VS2@GNSs composites could reach-49.83 dB at 1.83 mm,and an ultra-broad effective absorption bandwidth(EAB)of 6.72 GHz was attained when the matching thickness was 1.96 mm,attributable to the distinguished impedance matching characteristics and EMW attenuation capacities of 1D/2D VS2@GNSs composites.In addition,computer simulation technology(CST)full-wave simulation further confirmed VS2@GNSs composites manifested remarkable radar scattering cross-section(RCs)suppression in real-world application scenarios,with the RCS reduction value of up to 20.38 dB m2compared to metallic substrate.This work proposed the theoretical instruction and experimental basis for the design and fabrication of highperformance stealth materials. 展开更多
关键词 VS2@GNSs composites 1D/2D hierarchical structure EMW absorption CST simulation
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Enhanced furfural hydrogenation via Ru nanoparticles supported on CeO2-Mg(OH)2composite nanosheet 认领 引用
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作者 Xiao-jun ZHAO Li-qiang WANG +3 位作者 Guang-ji ZHANG Yin FANG You-nian LIU Tie-chui YUAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第4期1258-1268,共11页
Ru nanoparticles(NPs)supported on CeO2-Mg(OH)2 composite nanosheets,donated as Ru/CeO2-Mg(OH)2,are developed as the highly active catalyst for selective hydrogenation of furfural to furfuryl alcohol.Charac... Ru nanoparticles(NPs)supported on CeO2-Mg(OH)2 composite nanosheets,donated as Ru/CeO2-Mg(OH)2,are developed as the highly active catalyst for selective hydrogenation of furfural to furfuryl alcohol.Characterization results demonstrate that Ru NPs are adsorbed on the surface of the polyhedra of CeO2,which are scattered on the surface of the thin Mg(OH)2 nanosheets.Ru/CeO2-Mg(OH)2-0.2 achieves 92.6%conversion of furfural and 96.3%selectivity to furfuryl alcohol.Ru/CeO2-Mg(OH)2-0.2 retains high activity after six cycles,due to the introduction of CeO2 to form composite support that effectively prevents the leaching of Ru NPs.The strong metal-support interaction(SMSI)between Ru NPs and the CeO2-Mg(OH)2 composite support can tune the electronic structure of Ru NPs,which facilitates the H2 activation.Moreover,the CeO2-Mg(OH)2 interface exhibits specific adsorption of C=O bonds compared to the CeO2 alone.The composite-supported nanoparticles provide a valuable strategy for constructing highly efficient hydrogenation catalysts. 展开更多
关键词 Ru nanoparticles CeO2-Mg(OH)2composite support hydrogenation of furfural strong metal-support interaction electronic structure regulation
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Study on the preparation principle and strengthening mechanism of in-situ synthesized Mg-Li matrix composites through the La2O3→La→AlmLanroute 认领 引用
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作者 Xiaoqiang Li Xinlian He +5 位作者 Junze Zhang Daohe Zhang Dandan Li Qichi Le Jinhui Wang Dexue Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第6期505-520,共16页
In this study,low-cost La2O3powder modified with LiF-LiCl flux was used as a precursor and introduced into Mg-5Li-3Al-2Zn(LAZ532)alloy melt.Through a series of reactions,in-situ formed AlmLanphase-reinforc... In this study,low-cost La2O3powder modified with LiF-LiCl flux was used as a precursor and introduced into Mg-5Li-3Al-2Zn(LAZ532)alloy melt.Through a series of reactions,in-situ formed AlmLanphase-reinforced LAZ532 matrix composites were successfully prepared.The surface modification of La2O3powder by molten salt and the related reduction reaction mechanism in the alloy melt,as well as the effects of different La2O3additions on the microstructure and mechanical properties of the composites,were systematically investigated.First-principles calculations revealed that during precursor preparation,the Cl/F heteroatoms in the flux chemically destabilize La-O bonds,forming LaOF/LaOCl intermediates.Subsequently,Li atoms with low electronegativity and high reactivity in the melt preferentially combined with O/Cl/F,driving the reduction reactions.The reduced La then preferentially bonded with Al,predominantly forming the stable Al3La phase,along with small amounts of Al11La3 and Al2La phases.Microstructural analysis showed that as the La2O3content increased from 0.3%to 2.0 wt.%,the yield rate of La in the composite rose from 8%to 23%.Furthermore,the dispersed microano-sized AlmLanphases formed an atomically bonded interface with the matrix,and their size initially decreased and then slightly increased with increasing volume fraction.These phases promoted recrystallization through heterogeneous nucleation and grain boundary pinning,leading to texture weakening and grain refinement in the composites.The mechanical properties of the composites first improved and then deteriorated with increasing La2O3addition.Among them,the composite with 0.7 wt.%La2O3exhibited excellent comprehensive mechanical properties,with tensile strength,yield strength,and elongation reaching 278.3 MPa,182.5 MPa,and 23.6%,respectively.The enhancement in yield strength was mainly attributed to the synergistic effects of grain refinement,precipitation strengthening,and texture strengthening.This study offers a novel design concept for in-situ synthesized Mg-Li matrix composites,holding significant scientific value. 展开更多
关键词 Mg-Li matrix composites La2O3powder In situ synthesis Preparation principle Strengthening mechanism
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On-site hydrolytic H2production by CaH2/(Al/Si)composites via Na+bridging effect for fuel cell 认领 引用
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作者 Ali Hammad Siyi Zou +7 位作者 Fandi Ning Ghulam Nabi Yuzhuo Jiang Bin Tian Wentao Huang Muhammad Rashid Shiqi Zhao Xiaochun Zhou 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第1期97-110,I0004,共14页
Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH2/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreat... Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH2/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreatments,an inert environment,and long hours of physical ball milling for high homogeneity and synergistic effects.CaH2also inhibits the hydrolysis reaction by forming its products on the Al/Si surface,which hinders the direct utilization of composites.This work represents the first investigation of NaH-CaH2(Al/Si)fuel composites,which greatly overcome these limitations and can be directly used for on-site hydrogen generation and proton exchange membrane(PEM)fuel cells.The NaH-CaH2(Al/Si)fuel composites were prepared by using a straightforward mixing method with variable composition ratios,showing high H2yield and fuel cell(FC)performance.NaH addition provides the bridge effect,which opens up a new way to enable efficient hydrolysis and greatly enhances the hydrolysis activity of CaH2/(Al/Si)composites.The novel fuel composites(NaH-CaH2/Al)have extraordinary FC performance and a 0.42 W/cm2 peak power density greater than commercial hydrogen generators.It provides high H2yield 84.4%for NaH-CaH2/Al and 82%for NaH-CaH2/Si compared to NaOH-CaH2(Al/Si),NaCl-CaH2(Al/Si),and KCl-CaH2(Al/Si)composites.The NaH bridge effect hinders the direct water contact and stops the formation of Ca(OH)2 around Al/Si,which provides adequate pathways for the CaH2(Al/Si)hydrolysis.The impressive capabilities of novel fuel composites are anticipated to offer practical uses in fuel cells,automobile applications,and portable/on-board H2generation. 展开更多
关键词 On-site hydrogen Hydrolysis Fuel composites NaH-CaH2/(Al/Si) Bridge effect Ambient temperature Inorganic materials High H2yield PEM fuel cell
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Synthesis of 3D Co9S8/GNRs/Ti3C2Tx-MXene ternary composite toward enhanced oxygen evolution reaction 认领 引用
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作者 Liang Chen Xin-Rui Li +5 位作者 Yun Peng Chen-Xi Xu Wei Wang Jun-Lin Huang Bin-Bin Zhou Zhao-Hui Hou 《Metals Advances》 SCIE EI CAS CSCD 2026年第4期86-91,共6页
The incorporation of conductive supports is crucial for achieving superior electrocatalytic performance in transition metal sulfide(TMS)systems.However,the influence of conductive supports with different dimensions re... The incorporation of conductive supports is crucial for achieving superior electrocatalytic performance in transition metal sulfide(TMS)systems.However,the influence of conductive supports with different dimensions remains insufficiently explored.Hereby,quasi-1D graphene nanoribbons(GNRs)and 2D Ti3C2Tx-MXene are for the first time simultaneously introduced to construct a novel 3D Co9S8/GNRs/Ti3C2Txternary composite via a simple annealing process.Systematic characterizations reveal that the GNRs/Ti3C2Txcomposite support endows the ternary composite with superior properties,including a unique 3D architecture,improved Co9S8dispersibility,increased structural defects,and higher conductivity when compared to its binary counterparts.These advantages collectively contribute to significantly enhanced oxygen evolution reaction(OER)performance.Consequently,the Co9S8/GNRs/Ti3C2Txcatalyst delivers an overpotential of 285 mV at 10 cm-2 and a Tafel slope of 78 mV dec-1,surpassing other comparative catalysts and approaching the performance of commercial RuO2 catalyst.Additionally,it exhibits remarkable stability,with a negligible overpotential increase of only 2 mV during a 24 h durability test.When employed as an anode catalyst in water-splitting devices,the Co9S8/GNRs/TiC2Txcatalyst requires a low overpotential of 343 mV,manifesting substantial potential for water electrolysis.This work not only reports an excellent OER catalyst,but also offers a valuable strategy for designing high-performance ternary composites for energy-related reactions. 展开更多
关键词 3D Co9S8/GNRs/Ti3C2Txcomposite Conductive supports OER performance Water-splitting devices
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Enhancing photocatalytic CO2reduction with Z-scheme heterojunction Ag/Bi2MoO6/BiOBr composite films:Synthesis and mechanistic insights 认领 引用 被引量：1
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作者 LI Jiao ZHAO Jing +3 位作者 WANG Yiming ZHAO Wenhai CHAI Yizhuo ZHANG Xiaochao 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第4期140-150,共11页
This study presents the successful synthesis of a novel Z-scheme heterojunction composite film consisting of Ag/Bi2MoO6/BiOBr through electrochemical processes and ionexchange techniques,followed by the photodep... This study presents the successful synthesis of a novel Z-scheme heterojunction composite film consisting of Ag/Bi2MoO6/BiOBr through electrochemical processes and ionexchange techniques,followed by the photodeposition of noble metal silver(Ag)onto the composite structure.The catalytic efficiency of semiconductor photocatalysts is greatly improved by utilizing the localized surface plasmon resonance(LSPR)effect observed in Ag nanoparticles(NPs).Furthermore,the noble metal Ag serves as an intermediary bridge facilitating charge transfer between Bi2MoO6and BiOBr,while the formation of a Schottky barrier effectively inhibits the recombination of photo-generated electron-hole pairs.As a result,the Ag-deposited Bi2MoO6/BiOBr film exhibits superior photocatalytic performance in the reduction of CO2compared to its unmodified counterpart.Our experimental results indicate a non-linear relationship between Ag deposition and the efficiency of photocatalytic CO2reduction to CO,characterized by an initial increase in efficiency followed by a decline.The optimized 1.5%-Ag/Bi2MoO6/BiOBr film demonstrates exceptional photocatalytic activity,attaining a CO production rate of 13.65μmol/(g·h).This research explores the fundamental mechanisms that lead to improved photocatalytic CO2reduction capabilities of the Ag/Bi2MoO6/BiOBr film.Our research offers important perspectives for the thoughtful design and production of highly efficient photocatalysts,which are essential for advancing sustainable energy solutions. 展开更多
关键词 photocatalytic CO2reduction Ag NPs Bi2MoO6/BiOBr composite film Z-scheme heterojunction in situ synthesis
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Photocatalytic CO2Reduction Over BiOX on Needle Coke-Derived Graphene Composites 认领 引用
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作者 Tongyu Wu Xiaoxiao Yu +5 位作者 Fuhai Zhang Lei Wang Minmeng Tang Yanhong Chao Haiyan Liu Wenshuai Zhu 《Carbon and Hydrogen》 SCIE CAS CSCD 2026年第2期217-225,共9页
Substantial research has been dedicated to advancing visible-light photocatalysts for the conversion of CO2into sustainable fuels.The overall efficiency of this process is critically dependent on both the effective... Substantial research has been dedicated to advancing visible-light photocatalysts for the conversion of CO2into sustainable fuels.The overall efficiency of this process is critically dependent on both the effective generation/separation of photogenerated charge carriers and the adsorption/activation of CO2reactants.Bismuth oxyhalides(BiOX)are promising due to their layered structure and built-in electric field,which facilitate charge separation.However,their practical application is often limited by insufficient CO2adsorption capacity and restricted visible-light harvesting.Herein,we report a series of composite photocatalysts constructed via the in situ growth of BiOX on needle coke-derived graphene(NCG).This integrated structure leverages the high specific surface area and inherent heteroatom doping of NCG to enhance CO2adsorption,while the resulting intimate heterojunction significantly promotes visible-light absorption(especially within 500-800 nm)and accelerates interfacial charge transfer.The optimized BiOBr-25%NCG composite achieves a remarkable CO production rate of 46.32μmol·g−1·h−1from photocatalytic CO2reduction without any sacrificial agents,representing a 13-fold enhancement over pristine NCG and a∼4000-fold increase compared to bare BiOBr.The superior performance is attributed to the synergistic enhancement of light absorption,charge separation kinetics,and CO2adsorption activation.This work presents a viable strategy for developing efficient,low-cost photocatalytic systems by integrating functional carbon matrices derived from industrial byproducts with semiconductor catalysts. 展开更多
关键词 BiOBr CO2reduction composite material needle coke-derived graphene photocatalysis
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Spark plasma sintering and growth kinetics of WC-ZrO2ceramic matrix composites 认领 引用
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作者 Sen TAO Song LIANG +3 位作者 Wen HE Wei-hua CHEN Bing-liang LIANG Xin-gen WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1645-1658,共14页
WC-ZrO2ceramic matrix composites were fabricated via spark plasma sintering(SPS),and the effects of SPS on the microstructure,properties and grain growth kinetics of the composites were investigated.The phase compo... WC-ZrO2ceramic matrix composites were fabricated via spark plasma sintering(SPS),and the effects of SPS on the microstructure,properties and grain growth kinetics of the composites were investigated.The phase compositions,morphologies and particle sizes of all samples were studied using X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The results showed that the optimal SPS parameters were 1650℃,5 min and 40 MPa.WC-10 wt.% ZrO2possessed optimal comprehensive properties with a relative density,hardness,and fracture toughness of 99.9%,HV 2003,and 11.3 MPa·m1/2,respectively.The values of the growth kinetics index and growth activation energy for WC-10wt.%ZrO2in the long-axis and short-axis directions were approximately 2.173 and 421.342 kJ/mol,and 2.326 and 457.685 kJ/mol,respectively.The growth mass transfer mechanisms of WC ceramic and WC-ZrO2ceramic matrix composites were controlled respectively by ion random diffusion and grain boundary diffusion. 展开更多
关键词 WC ceramic matrix composites ZrO2 spark plasma sintering sintering technology grain growth kinetics
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Fabrication,microstructure and high-temperature strengthening mechanism of multi-scale Ti2AlC/TiAl composite 认领 引用
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作者 Zhe DENG Pei LIU +3 位作者 Zhi-yong ZHANG Ai-qin WANG Jing-pei XIE Zhen-bo WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第4期1140-1151,共12页
The multi-scale Ti2AlC/TiAl composites were fabricated.Micro-Ti2AlC particles are obtained in-situ at the grain boundaries of the full lamellar TiAl matrix by vacuum arc melting.The targeted precipitation of sub... The multi-scale Ti2AlC/TiAl composites were fabricated.Micro-Ti2AlC particles are obtained in-situ at the grain boundaries of the full lamellar TiAl matrix by vacuum arc melting.The targeted precipitation of submicro-Ti2AlC at the lamellae TiAl/Ti3Al phase boundary and directional precipitation of nano-Ti2AlC within TiAl crystals are achieved by heat treatment.And the best high-temperature tensile properties are obtained when the graphite powder is added at 2 at.%,resulting in a tensile strength of 561 MPa and an elongation of 3.6%.These findings underscore the multifaceted role played by the multi-scale Ti2AlC:micro-Ti2AlC effectively inhibits grain boundary softening and hinders dislocation motion,while submicro-Ti2AlC prevents twin propagation and obstructs dislocation motion.Nano-Ti2AlC,on the other hand,not only hinders dislocation movement but also fine-tunes the lamellar microstructure. 展开更多
关键词 multi-scale Ti2AlC/TiAl composite microstructure mechanical properties reinforcement mechanism
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Synergistic enhancement of visible-light photocatalytic methyl orange degradation via oxygen vacancy TiO2/Sn3O4 composites 认领 引用
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作者 Cailing Jia Zhanting Zhang +4 位作者 Fuwei Yan Fuyue Liu Yanni Wu Fen Wang Haijiao Xie 《日用化学工业（中英文）》 CAS 北大核心 2026年第2期191-200,共10页
The escalating pace of industrialization has significantly intensified water pollution challenges,for instance,the persistent organic pollutants like methyl orange(MO).Conventional remediation techniques,such as adsor... The escalating pace of industrialization has significantly intensified water pollution challenges,for instance,the persistent organic pollutants like methyl orange(MO).Conventional remediation techniques,such as adsorption and biological degradation,are often hampered by low efficiency and the risk of secondary pollution.Photocatalysis emerges as a promising sustainable alternative;however,the benchmark material titanium dioxide(TiO2)suffers from its intrinsic limitations,notably its wide bandgap energy(≥3.4 eV)restricting its activity to the region of the ultraviolet light and its rapid recombination of photogenerated charge carriers.To overcome these constraints,this research focused on synthesizing novel TiO2/Sn3O4 heterojunction composite photocatalysts via a solvothermal approach.Comprehensive characterization techniques confirmed the successful formation of the composite,which revealed that ultrathin Sn3O4 nanosheets uniformly coated TiO2 nanospheres.This unique architecture effectively reduced the overall crystallinity and introduced the beneficial oxygen vacancies.Under visible-light irradiation(λ≥420 nm),the optimized TiO2/Sn3O4 composite exhibited the exceptional photocatalytic performance,which achieved 96%degradation of MO within just 60 minutes.The calculated apparent kinetic rate constant(0.103 min-1)was remarkably(5.15 times)higher than that of pristine TiO2.ESR experiments identified that hydroxyl radicals(·OH)was the predominant active species driving the degradation.Furthermore,cyclic degradation tests demonstrated its excellent material stability,with the composite retaining 85%of its initial efficiency after four consecutive reuse cycles.This work underscored the synergistic effects within the TiO2/Sn3O4 heterojunction,which significantly enhanced the visible-light absorption,charge separation,and photocatalytic activity,which provided the valuable insights for designing efficient,stable catalysts for the advanced environmental remediation applications. 展开更多
关键词 TiO2/Sn3O4composite visible-light photocatalysis methyl orange degradation oxygen vacancies hydroxyl radicals
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Can one composite index capture both inflammatory and metabolic cardiovascular risk in type 2 diabetes? 认领 引用
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作者 Young-Hye Cho Jung In Choi Sang Yeoup Lee 《World Journal of Diabetes》 SCIE 2026年第7期26-37,共12页
Cardiovascular disease is a leading cause of morbidity and mortality in type 2 diabetes mellitus(T2DM),although optimal biomarker strategies for risk stratification remain incompletely defined.C-reactive protein(CRP)c... Cardiovascular disease is a leading cause of morbidity and mortality in type 2 diabetes mellitus(T2DM),although optimal biomarker strategies for risk stratification remain incompletely defined.C-reactive protein(CRP)consistently predicts cardiovascular events in the general population,but its incremental value in T2DM-where chronic low-grade inflammation is already prevalent-has been debated.Fasting C-peptide(FCP),a surrogate marker ofβ-cell function and insulin resistance,shows paradoxical associations with cardiovascular outcomes,with bidirectional risk observed at both high and low levels.Such inconsistencies highlight the limitations of single biomarkers and have led to interest in composite approaches that integrate inflammatory and metabolic pathways.A recent study comprehensively introduced the CRP-FCP product,a multiplicative composite index demonstrating independent associations with cardiovascular,cerebrovascular,and combined vascular events,even when neither component alone achieved consistent significance across all vascular territories.This finding builds on the Danish DD2 cohort,where co-elevation of both biomarkers conferred the highest cardiovascular and mortality risk.In our view,the CRP-FCP product is best understood as a conceptual attempt to integrate inflammatory and metabolic risk signals rather than as a definitive predictive tool.While biologically plausible,its incremental value,methodological robustness,and generalizability across populations remain to be established,particularly in comparison with existing composite indices such as the triglyceride-glucose index. 展开更多
关键词 Type 2 diabetes mellitus C-reactive protein Fasting C-peptide Composite biomarker Cardiovascular risk Insulin resistance Inflammation Triglyceride-glucose index Cerebrovascular events East Asian population
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Microstructure and properties of Cu-TiB2 composites prepared by mechanical stirring-assisted double-melt in-situ reaction 认领 引用 被引量：4
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作者 Tao Zhou Xu Wang +7 位作者 Liu-Xin Qin Yan-Bin Jiang Meng Wang Yan-Jun Ding Bai-Rui Qi Zhu Xiao Yan-Lin Jia Zhou Li 《Rare Metals》 SCIE EI CAS CSCD 2025年第2期1342-1362,共21页
A novel mechanical stirring-assisted double-melt in-situ reaction casting process was developed to prepare Cu-1TiB2(wt%)composites.The effects of preparation parameters(melting reaction temperature,stirring rate and s... A novel mechanical stirring-assisted double-melt in-situ reaction casting process was developed to prepare Cu-1TiB2(wt%)composites.The effects of preparation parameters(melting reaction temperature,stirring rate and stirring time)on the microstructure and properties of Cu-1TiB2 composites were investigated.The melt viscosity and particle motion during stirring process were analyzed.The strong turbulence and shear effects generated by mechanical stirring in the melt not only significantly improve the particle distribution but also contribute to adequate in-situ reactions and precise control of the chemical composition.The optimal preparation parameters were 1200℃,a stirring rate of 100 r·min−1 and a stirring time of 1 min.Combined with the cold rolling process,the tensile strength,elongation and electrical conductivity of the composite reached 475 MPa,6.0%and 88.4%IACS,respectively,which were significantly better than the composite prepared by manual stirring.The good plasticity is attributed to the uniform distribution of TiB2 particles,effectively retarding the crack propagation.The dispersion of particles promotes heterogeneous nucleation of Cu matrix and inhibits grain growth.On the other hand,dispersed particles contribute to grain shear fracture and dislocation multiplication during cold deformation.Therefore,the composite achieves higher dislocation strengthening and grain boundary strengthening. 展开更多
关键词 Stir casting In-situ reaction Microstructure Cu-TiB2composites Mechanical properties
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Gel/nonwoven composite membrane with dual water transport pathways for controlling hydrogen production by regulating water vapor absorption and diffusion 认领 引用
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作者 Siyi Zou Ali Hammad +7 位作者 Jiahao Huang Yuzhuo Jiang Bin Tian Fandi Ning Wei Li Qinglin Wen Xingyu Zhu Xiaochun Zhou 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第4期383-389,共7页
Calcium hydride(CaH2)is a hydrogen storage material with high hydrogen storage density that is easy to transport and store.However,its hydrogen generation process is intense and liquid water causes uneven reactions... Calcium hydride(CaH2)is a hydrogen storage material with high hydrogen storage density that is easy to transport and store.However,its hydrogen generation process is intense and liquid water causes uneven reactions in CaH2.These two issues make the reaction of CaH2 hard to control.To resolve the issues,a gelonwoven fabric composite material was prepared using nonwoven fabric and poly(vinyl alcohol)/polyacrylamide(PVA/PAM)hydrogel,and applied to a compact hydrogen generator.Water absorption and evaporation tests on composite membranes confirm that the membrane can control the water transport rate by adjusting the gel content,thereby regulating the hydrogen production of CaH2.During the hydrolysis of CaH2,the heat released promotes water evaporation,which absorbs some of this heat and helps maintain both temperature and water balance.When the gel content was 10%,the height of the separator was 1 mm,and the mass of CaH2 was 1.5 g,the hydrogen generator achieved the fastest hydrogen production rate of 58.7 mL/min.Moreover,after expanding the size of the hydrogen generator,it can continuously produce hydrogen for over 260 min at room temperature.Finally,hydrogen was supplied to a proton exchange membrane fuel cell(PEMFC)stack.This research provides a new concept for controllable hydrogen production and portable fuel cells. 展开更多
关键词 Composite membrane Hydrogen Portable PEMFC CaH2 PVA/PAM hydrogel Nonwoven fabric
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Scalable Synthesis of Ultrathin Silica Nanosheets for Applications in Thermal-Management Aerogels and Flexible Composite Films 认领 引用
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作者 Qun-Yao Yuan Yuan-Fan Gu +1 位作者 Rong-Rong Cheacharoen Jie Zhao 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期569-579,共11页
Silica nanosheets(SiO2 NSs) hold great promise for advanced thermal protection applications because of their exceptional thermal and chemical stability.However,their development has been hindered by challenges in s... Silica nanosheets(SiO2 NSs) hold great promise for advanced thermal protection applications because of their exceptional thermal and chemical stability.However,their development has been hindered by challenges in scalable synthesis and structural integration for specialized applications.Herein,we report a facile and scalable wet-chemical strategy for producing high-quality and ultrathin SiO2 NSs with lateral dimension more than 5 μm and thickness of ~2 nm.After graphene oxide(GO)-templated thermal treatment,the mechanical stiffness of the SiO2 NSs was significantly enhanced from 60.9 to 76.1 GPa.Leveraging their unique ultrathin and large lateral properties,the ultralight SiO2 NSs aerogel was achieved via a bidirectional freeze-casting technique.The aerogel demonstrates excellent fire resistance and high-temperature tolerance,maintaining its structure upon direct exposure to 1200℃ flames.Furthermore,the integration of SiO2 NSs into a polycaprolactone(PCL) matrix has enabled the development of a large-area and flexible fire-retardant composite film,which exhibits an exceptional flame selfextinguishing time of 2 s and mechanical flexibility.This work offers a scalable platform for fabricating functional SiO2 NSsbased materials and paves the way for their potential application in energy devices,aerospace protection,and flexible electronics. 展开更多
关键词 SiO2aerogels SiO2composite films SiO2nanosheets thermal management
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Chemistry of CeO2-derived nanocomposites photocatalysts for environment monitoring and energy conversion 认领 引用 被引量：2
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作者 Anees A.Ansari Ruichan Lv +1 位作者 Shili Gai Piaoping Yang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第4期70-113,共44页
Photocatalysis is an important process in energy conversion and environmental usage because of its feasible,profitable,and environmentally safe benefits.Coordination chemistry of the CeO2is gaining significant inte... Photocatalysis is an important process in energy conversion and environmental usage because of its feasible,profitable,and environmentally safe benefits.Coordination chemistry of the CeO2is gaining significant interest because its nanocomposites show unique characteristics namely optically active,wide bandgap(Eg),reversible valence states(Ce3+/4+),rich defect architectures,high O2storage capability,ionic conductivity,and exceptional chemical resistance.Systematically summarized the importance of synthesis methods,particle morphology,and crystal structure aiming at how to heighten the efficacy of CeO2-derived hybrid heterojunction(HHJ)photocatalyst.Selection of an appropriate synthesis method and morphology of the composite materials are beneficial in inhibiting the rapid electron-hole(e−-h+)recombination,improvement in visible light adsorption,and large generation of e−-h+pairs to accelerate the photocatalysts activities.Various modification approaches include elemental doping(metalon-metal doping),heterojunction construction(lower/wide Eg semiconductors(SCD),carbon,conducting polymeric materials),imperfection engineering,and multicomponent hybrid composites.These methods assist as a valuable resource for the rational design of effective CeO2-based composite photocatalysts for sustainable development owing to the enhancement of oxygen species mobility,rapid charge transfer,maximum visible light captivation and slow down the charge recombination rate with increase photogeneration of e−-h+pairs.Also examines the advancements made in CeO2conjugated hybrid composites in photo-oxidation of wastewater effluents(antibiotic/organic dyes/chemical/pharmaceutical),heavy metal removal,H2 production,CO2reduction,and H2O splitting applications.Subsequently,the difficulties and fundamental ideas behind several heterojunction photocatalysts encountered by CeO2-based composites are examined,and future directions for their development are suggested. 展开更多
关键词 Photodegradation Heterojunction CeO2 Oxygen vacancies Composite
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Gyroid-structured SiOC composite with excellent broadband microwave absorption and load-bearing performance 认领 引用
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作者 Hanjun Wei Siyu Chen +5 位作者 Zhiyong Chen Lu Tang Jimei Xue Cunxian Wang Zhijun Wang Ying Li 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期277-288,共12页
Designing materials with both structural load-bearing capacity and broadband electromagnetic(EM)wave absorption properties remains a significant challenge.In this work,SiOC/SiC/SiO2composite with gyroid structures ... Designing materials with both structural load-bearing capacity and broadband electromagnetic(EM)wave absorption properties remains a significant challenge.In this work,SiOC/SiC/SiO2composite with gyroid structures were prepared through digital light processing(DLP)3D printing,polymer-derived ceramics(PDCs),chemical vapor infiltration(CVI),and oxidation technologies.The incorporation of the CVISiC phase effectively increases the dissipation capability,while the synergistic interaction between the gyroid structure and SiO2phase significantly improves impedance matching performance.The SiOC/SiC/SiO2composite achieved a minimum reflection loss(RL min)of-62.2 d B at 4.3 mm,and the effective absorption bandwidth(EAB)covered the X-band,with a thickness range of 4.1 mm-4.65 mm.The CST simulation results explain the broadband and low-frequency absorption characteristics,with an EAB of 8.4 GHz(9.6-18 GHz)and an RL min of-21.5 dB at 5 GHz.The excellent EM wave attenuation performance is associated primarily with polarization loss,conduction loss,the gyroid structure's enhancement of multiple reflections and scattering of EM waves,and the resonance effect between the structural units.The SiOC/SiC/SiO2composite also demonstrated strong mechanical properties,with a maximum compressive failure strength of 31.6 MPa in the height direction.This work opens novel prospects for the development of multifunctional structural wave-absorbing materials suitable for broadband microwave absorption and load-bearing properties. 展开更多
关键词 Digital light processing Gyroid structure SiOC/SiC/SiO2composite Microwave absorption Load-bearing properties
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Tuning Oxygen Vacancies by Construction of a SiO2@TiO2 Core-Shell Composite Structure for Boosting Photocatalytic CO2 Reduction Towards CH4 认领 引用 被引量：2
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作者 Jinshuo Li Chi Cao +5 位作者 Xiaoyu Zhang Huahua Dong Mengfei Wang Lin Zhang Zihao Xing Wensheng Yang 《Carbon Energy》 SCIE EI CSCD 2025年第4期62-73,共12页
Controlled photocatalytic conversion of CO2 into premium fuel such as methane(CH4)offers a sustainable pathway towards a carbon energy cycle.However,the photocatalytic efficiency and selectivity are still unsatisfa... Controlled photocatalytic conversion of CO2 into premium fuel such as methane(CH4)offers a sustainable pathway towards a carbon energy cycle.However,the photocatalytic efficiency and selectivity are still unsatisfactory due to the limited availability of active sites on the current photocatalysts.To resolve this issue,the design of oxygen vacancies(OVs)in metal-oxide semiconductors is an effective option.Herein,in situ deposition of TiO2 onto SiO2 nanospheres to construct a SiO2@TiO2 core-shell structure was performed to modulate the oxygen vacancy concentrations.Meanwhile,charge redistribution led to the formation of abundant OV-regulated Ti-Ti(Ti-OV-Ti)dual sites.It is revealed that Ti-OV-Ti dual sites served as the key active site for capturing the photogenerated electrons during light-driven CO2 reduction reaction(CO2RR).Such electron-rich active sites enabled efficient CO2 adsorption and activation,thus lowering the energy barrier associated with the rate-determining step.More importantly,the formation of a highly stable*CHO intermediate at Ti-OV-Ti dual sites energetically favored the reaction pathway towards the production of CH4 rather than CO,thereby facilitating the selective product of CH4.As a result,SiO2@TiO2-50 with an optimized oxygen vacancy concentration of 9.0% showed a remarkable selectivity(90.32%)for CH4 production with a rate of 13.21μmol g-1 h-1,which is 17.38-fold higher than that of pristine TiO2.This study provides a new avenue for engineering superior photocatalysts through a rational methodology towards selective reduction of CO2. 展开更多
关键词 oxygen vacancy photocatalytic CO2methanation SiO2@TiO2core-shell composite structure Ti-OV-Ti dual sites
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Ti3C2Tx Composite Aerogels Enable Pressure Sensors for Dialect Speech Recognition Assisted by Deep Learning 认领 引用 被引量：5
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作者 Yanan Xiao He Li +8 位作者 Tianyi Gu Xiaoteng Jia Shixiang Sun Yong Liu Bin Wang He Tian Peng Sun Fangmeng Liu Geyu Lu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第5期1-15,共15页
Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound detection.However,current intelligent speech assistants based on pressure sensors can only recognize standard languages... Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound detection.However,current intelligent speech assistants based on pressure sensors can only recognize standard languages,which hampers effective communication for non-standard language people.Here,we prepare an ultralight Ti3C2TxMXene/chitosan/polyvinylidene difluoride composite aerogel with a detection range of 6.25 Pa-1200 k Pa,rapid responseecovery time,and low hysteresis(13.69%).The wearable aerogel pressure sensor can detect speech information through the throat muscle vibrations without any interference,allowing for accurate recognition of six dialects(96.2%accuracy)and seven different words(96.6%accuracy)with the assistance of convolutional neural networks.This work represents a significant step forward in silent speech recognition for human–machine interaction and physiological signal monitoring. 展开更多
关键词 Pressure sensor Wearable sensor Ti3C2Tx composite aerogel Dialect speech recognition
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B2-CuZr reinforced amorphous alloy matrix composites:A review 认领 引用 被引量：1
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作者 Wei Guo Run-hua Huang +5 位作者 Zhen Zhang Mi Zhao Jin-cheng Wang Yan-qiang Qiao Shu-lin Lü Shu-sen Wu 《China Foundry》 SCIE EI CAS CSCD 2025年第1期1-11,共11页
B2-CuZr phase reinforced amorphous alloy matrix composites has become one of the research hotspots in the field of materials science due to the“transformation-induced plasticity”phenomenon,which makes the composites... B2-CuZr phase reinforced amorphous alloy matrix composites has become one of the research hotspots in the field of materials science due to the“transformation-induced plasticity”phenomenon,which makes the composites show better macroscopic plastic deformability and obvious work-hardening behavior compared to the conventional amorphous alloy matrix composites reinforced with ductile phases.However,the in-situ metastable B2-CuZr phase tends to undergo eutectoid decomposition during solidification,and the volume fraction,size,and distribution of B2-CuZr phase are difficult to control,which limits the development and application of these materials.To date,much efforts have been made to solve the above problems through composition optimization,casting parameter tailoring,and post-processing technique.In this study,a review was given based on relevant studies,focusing on the predictive approach,reinforcing mechanism,and microstructure tailoring methods of B2-CuZr phase reinforced amorphous alloy matrix composites.The research focus and future prospects were also given for the future development of the present composite system. 展开更多
关键词 amorphous alloy matrix composite B2-CuZr phase plasticity microstructure tailoring
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Microstructural optimization and strengthening mechanisms of in-situ TiB2/Al–Cu composite after multidirectional forging for six passes 认领 引用 被引量：1
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作者 Sen Yang Zhiren Sun +4 位作者 Zipeng Wang Shuhui Zhao Kaikun Wang Dun Li Xiaokai Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第7期1703-1718,共16页
In-situ TiB2/Al–Cu composite was processed by multidirectional forging(MDF)for six passes.The microstructure evolution of the forged workpiece was examined across various regions.The mechanical properties of the a... In-situ TiB2/Al–Cu composite was processed by multidirectional forging(MDF)for six passes.The microstructure evolution of the forged workpiece was examined across various regions.The mechanical properties of the as-cast and MDFed composites were compared,and their strengthening mechanisms were analyzed.Results indicate that the grain refinement achieved through the MDF process is mainly due to the subdivision of the original grains through mechanical geometric fragmentation and the occurrence of dynamic recrystallization(DRX).DRX grains are formed through discontinuous DRX,continuous DRX,and recrystallization induced by particle-stimulated nucleation.A rise in accumulated equivalent strain(Σ?ε)results in finerα-Al grains and a more uniform distribution of TiB2particles,which enhance the Vickers hardness of the composite.In addition,the tensile properties of the MDFed composite significantly improve compared with those of the as-cast composites,with ultimate tensile strength and yield strength increasing by 51.2%and 54%,respectively.This enhancement is primarily due to grain refinement strengthening and dislocation strengthening achieved by the MDF process. 展开更多
关键词 in-situ TiB2/Al-Cu composite multidirectional forging grain refinement dynamic recrystallization tensile properties
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