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Elaborately designed multilayers honeycomb-like MXene/BPQDs hierarchical architecture anode for SIBs with excellent kinetics 认领 引用
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作者 Jin-Hao Zhang Li-Su Zhang +3 位作者 Tian-Sheng Mu Yue Liang Fei-Li Lai Xiao-Dong Zhu 《Rare Metals》 SCIE EI CAS CSCD 2025年第11期8453-8464,共12页
Black phosphorus quantum dots(BPQDs)show great promise as anode material for sodium-ion batteries(SIBs)due to their high theoretical capacity and short ion diffusion pathways.However,the challenges of low electronic c... Black phosphorus quantum dots(BPQDs)show great promise as anode material for sodium-ion batteries(SIBs)due to their high theoretical capacity and short ion diffusion pathways.However,the challenges of low electronic conductivity and aggregation of BPQDs hinder their performance in SIBs.Loading BPQDs onto MXene nanosheets can address these issues,but the two-dimensional nano sheets may restack into a dense film during the filtration process,limiting reaction kinetics.Here,we report,for the first time,a bionic strategy for multilayer honeycomb-like MXene/BPQDs(MLHM/BPQDs)hierarchical architecture anode for SIBs.MXene nanosheets are arranged to ordered honeycomb layers and interlayer channels through the dual-template method.MXene nanosheets are arranged to ordered honeycomb layers and interlayer channels through the dual-templates method,and then,BPQDs are uniformly self-assembled onto the inwalls of the honeycomb.The unique open hierarchical architecture serves as an excellent substrate for rapid electron transport.Its large specific surface area offers more sites for BPQDs loading,preventing aggregation,and provides abundant channels and space for electrolyte infiltration and BPQDs volume change.The-O terminal groups increased after annealing,and the abundant-O/-F terminal groups on the surface of MXene can effectively enhance the binding energy and diffusion rate of Na+.The synergy of structure and surface chemistry accelerates the kinetics for MLHM/BPQDs,delivering a high reversible capacity of653 mAh g-1after 500 cycles at 2 A g-1(94.3%capacity retention),which demonstrates its great potential as a SIBs anode material. 展开更多
关键词 Honeycomb-like structure Black phosphorus quantum dots Sodium storage Self-assembly Excellent kinetics
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Reversible Oxygen-Rich Functional Groups Grafted 3D Honeycomb-Like Carbon Anode for Super-Long Potassium Ion Batteries 认领 引用 被引量：17
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作者 Na Cheng Wang Zhou +2 位作者 Jilei Liu Zhigang Liu Bingan Lu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第9期132-146,共15页
Studies have found that oxygen-rich-containing functional groups in carbon-based materials can be used as active sites for the storage performance of K+,but the basic storage mechanism is still unclear.Herein,we co... Studies have found that oxygen-rich-containing functional groups in carbon-based materials can be used as active sites for the storage performance of K+,but the basic storage mechanism is still unclear.Herein,we construct and optimize 3D honeycomb-like carbon grafted with plentiful COOH/C=O functional groups(OFGC)as anodes for potassium ion batteries.The OFGC electrode with steady structure and rich functional groups can effectively contribute to the capacity enhancement and the formation of stable solid electrolyte interphase(SEI)film,achieving a high reversible capacity of 230 mAh g-1 at 3000 mA g-1 after 10,000 cycles(almost no capacity decay)and an ultra-long cycle time over 18 months at 100 mA g-1.The study results revealed the reversible storage mechanism between K+and COOH/C=O functional groups by forming C-O-K compounds.Meanwhile,the in situ electrochemical impedance spectroscopy proved the highly reversible and rapid de/intercalation kinetics of K+in the OFGC electrode,and the growth process of SEI films.In particular,the full cells assembled by Prussian blue cathode exhibit a high energy density of 113 Wh kg-1 after 800 cycles(calculated by the total mass of anode and cathode),and get the light-emitting diodes lamp and ear thermometer running. 展开更多
关键词 Honeycomb-like Super-long Carbon anode Potassium-ion batteries
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Fabrication and gas sensing property of honeycomb-like ZnO 认领 引用 被引量：9
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作者 Chao Li Zhi Shuo Yu +4 位作者 Shao Ming Fang Huan Xin Wang Yang Hai Gui Jia Qiang Xu Rong Feng Chen 《Chinese Chemical Letters》 SCIE CAS 2008年第5期599-603,共5页
We report the structural characterization and proposed formation mechanism of honeycomb-like ZnO conglomerations fabricated by direct precipitation method. X-ray diffraction （XRD）, energy-disperse X-ray spectrometry... We report the structural characterization and proposed formation mechanism of honeycomb-like ZnO conglomerations fabricated by direct precipitation method. X-ray diffraction （XRD）, energy-disperse X-ray spectrometry （EDS）, scanning electron microscopy （SEM） showed that the as-prepared ZnO calcined at 700 ℃ were micron sphere particles with honeycomb-like structure. In the UV-vis absorbing spectrum, it was observed that there is a new additional absorption band at 260 nm, and it was speculated that the absorption may be caused by defects on the surface and interface of honeycomb-like ZnO. The as-products showed high sensitivity and short response time to sulfured hydrogen gas. These results demonstrate that honeycomb-like ZnO conglomerations are very promising materials for fabricating H2S gas sensors. 展开更多
关键词 ZnO Precipitation Honeycomb-like Gas sensing property
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Honeycomb-like carbon materials derived from coffee extract via a “salty” thermal treatment for high-performance Li-I2 batteries 认领 引用 被引量：11
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作者 Zhong Su Han Yeu Ling +4 位作者 Meng Li Shangshu Qian Hao Chen Chao Lai Shanqing Zhang 《Carbon Energy》 SCIE CAS 2020年第2期265-275,共11页
Sustainable,conductive,and porous carbon materials are ideal for energy storage materials.In this study,honeycomb-like carbon materials(HCM)are synthesized via a“salty”thermal treatment of abundant and sustainable c... Sustainable,conductive,and porous carbon materials are ideal for energy storage materials.In this study,honeycomb-like carbon materials(HCM)are synthesized via a“salty”thermal treatment of abundant and sustainable coffee extract.Systematic materials characterization indicates that the as-prepared HCM consists of heteroatoms(N and O,etc.)doped ultra-thin carbon framework,possesses remarkable specific surface area,and excellent electrical conductivity.Such properties bestow HCM outstanding materials to be the blocking layer for Li-I2 battery,significantly eliminating the dissolution of I2 in the cathode region and stopping the I2 from shutting to anode compartment.Furthermore,our electrochemical investigation suggests that HCM could incur surface pseudo-capacitive iodine-ions charge storage and contribute additional energy storage capacity.As a result,the resultant Li-I2 battery achieves a robust and highly reversible capacity of 224.5 mAh·g−1 at the rate of 10 C.Even under a high rate of 50 C,the remarkable capacity of the as-prepared Li-I2 battery can still be maintained at 120.2 mAh·g−1 after 4000 cycles. 展开更多
关键词 adsorption blocking layer honeycomb-like carbon materials Li-I2 battery pseudo-capacity
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N-doped honeycomb-like porous carbon towards high-performance supercapacitor 认领 引用 被引量：6
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作者 Feng Wang Lian Chen +6 位作者 Huiling Li Gaigai Duan Shuijian He Lin Zhang Guoying Zhang Zhengping Zhou Shaohua Jiang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第7期1986-1990,共5页
Biomass-derived porous carbon with developed pore structure is critical to achieving high performance electrode materials.In this work,we report a grape-based honeycomb-like porous carbon(GHPC)prepared by KOH activati... Biomass-derived porous carbon with developed pore structure is critical to achieving high performance electrode materials.In this work,we report a grape-based honeycomb-like porous carbon(GHPC)prepared by KOH activation and carbonization,followed by N-doping(NGHPC).The obtained NGHPC exhibits a unique honeycomb-like structure with hierarchically interconnected micro/mesopores,and high specific surface area of 1268 m^2/g.As a supercapacitor electrode,the NGPHC electrode exhibits a remarkable specific capacitance of 275 F/g at 0.5 A/g in a three-electrode cell.Moreover,the NGHPC//NGHPC symmetric supercapacitor displays a high energy density of 12.6 Wh/kg,and excellent cycling stability of approximately 95.2% capacitance retention after 5000 cycles at 5 A/g.The excellent electrochemical performance of NGHPC is ascribed to its high specific surface area,honeycomb-like structure and high-content of pyrodinic-N(36.29%).It is believed that grape-based carbon materials show great potential as advanced electrode materials for supercapacitors. 展开更多
关键词 Grape Honeycomb-like Porous carbon Activation Supercapacitor
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P-doped CoSe2nanoparticles embedded in 3D honeycomb-like carbon network for long cycle-life Na-ion batteries 认领 引用 被引量：5
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作者 Jiajia Ye Xuting Li +4 位作者 Guang Xia Guanghao Gong Zhiqiang Zheng Chuanzhong Chen Cheng Hu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第18期100-107,共8页
We report for the first time a Na-ion battery anode material composed of P-doped CoSe2nanoparticles(P-CoSe2)with the size of 5–20 nm that are uniformly embed in a 3 D porous honeycomb-like carbon network.High r... We report for the first time a Na-ion battery anode material composed of P-doped CoSe2nanoparticles(P-CoSe2)with the size of 5–20 nm that are uniformly embed in a 3 D porous honeycomb-like carbon network.High rate capability and cycling stability are achieved simultaneously.The honeycomb-like carbon network is rationally designed to support high electrical conductivity,rapid Na-ion diffusion as well as the accommodation of the volume expansion from the active P-CoSe2nanoparticles.In particular,heteroatom P-doping within CoSe2introduces stronger P-Co bonds and additional P-Se bonds that significantly improve the structure stability of P-CoSe2for highly stable sodiation/desodiation over long-term cycling.P-doping also improves the electrical conductivity of the CoSe2nanoparticles,leading to highly elevated electrochemical kinetics to deliver high specific capacities at high current densities.Benefiting from the unique nanostructure and atomic-level P-doping,the P-CoSe2(2:1)/C anode delivers an excellent cycle stability with a specific capacity of 206.9 mA h g-1achieved at 2000 mA g-1after 1000 cycles.In addition,this material can be synthesized using a facile pyrolysis and selenization/phosphorization approach.This study provides new opportunities of heteroatom doping as an effective method to improve the cycling stability of Na-ion anode materials. 展开更多
关键词 CoSe2 P-doping Honeycomb-like carbons Anodes Sodium-ion batteries
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Boosting oxygen evolution reactivity by modulating electronic structure and honeycomb-like architecture in Ni2P/N,P-codoped carbon hybrids 认领 引用
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作者 Menglei Yuan Yu Sun +8 位作者 Yong Yang Jingxian Zhang Sobia Dipazir Tongkun Zhao Shuwei Li Yongbing Xie He Zhao Zhanjun Liu Guangjin Zhang 《Green Energy & Environment》 SCIE EI CAS CSCD 2021年第6期866-874,共9页
Oxygen evolution reaction(OER)as the foremost stumbling block to generate cost-effective clean fuels has received extensive attention in recent years.But,it still maintains the challenge to manipulate the geometric an... Oxygen evolution reaction(OER)as the foremost stumbling block to generate cost-effective clean fuels has received extensive attention in recent years.But,it still maintains the challenge to manipulate the geometric and electronic structure during single reaction process under the same conditions.Herein,we report a simple self-template strategy to generate honeycomb-like Ni2P/N,P-C hybrids with preferred electronic architecture.Experiments coupled with theoretical results revealed that the synthesized catalyst has two characteristics:firstly,the unique honeycomb-like morphology not only enables the fully utilization of catalytic active sites but also optimizes the mass/electron transportation pathway,which favor the diffusion of electrolyte to accessible active sites.Secondly,N,P-C substrate,on the one hand,largely contributes the electronic distribution near Fermi level(EF)thus boosting its electrical conductivity.On the other hand,the support effect result in the upshift of d-band center and electropositivity of Ni sites,which attenuates the energy barrier for the adsorption of OH~àand the formation of*OOH.In consequence,the optimized Ni2P/N,P-C catalysts feature high electrocatalytic activity towards OER(a low overpotential of 252 m V to achieve10 m A cm-2)and 10 h long-term stability,the outstanding performance is comparable to most of transition metal catalysts.This work gives a innovative tactics for contriving original OER electrocatalysts,inspirng deeper understanding of fabricating catalysts by combining theoretical simulation and experiment design. 展开更多
关键词 Oxygen evolution reaction Ni2P Modulating electronic structure Honeycomb-like architecture
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High-efficiency electrochemical H2O2synthesis by heteroatom-doped NiX/Ni nanocomposites with honeycomb-like porous carbon 认领 引用 被引量：4
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作者 Mengran Liu Canyu Liu +7 位作者 Tianfang Yang Shixiang Hu Siyun Li Shizhe Liu Yang Liu Ye Chen Bingcheng Ge Shuyan Gao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2024年第11期212-222,共11页
Transition metal Ni anchored in carbon material represents outstanding 2e- oxygen reduction reaction(ORR)catalytic selectivity,but enhancing the adsorption strength of intermediate*OOH to promote its selectivity re... Transition metal Ni anchored in carbon material represents outstanding 2e- oxygen reduction reaction(ORR)catalytic selectivity,but enhancing the adsorption strength of intermediate*OOH to promote its selectivity remains a major challenge.Herein,the NiX/Ni@NCHS composite catalyst with heteroatom doping(O,S)is modulated by controlling partial pyrolysis strategies on honeycomb-like porous carbon to manipulate the electronic structure of the metal Ni.With the synergistic effect of honeycomb structure and O atom,NiO/Ni@NCHS-700 exhibits an exceptional H2O2selectivity of above 89.1%across a wide potential range from 0.1 to 0.6 V in an alkaline electrolyte,and an unexpected H2O2production rate up to 1.47 mol gcat-1 h-1@0.2 V,which outperforms most of the state-of-the-art catalyst.Meanwhile,NiS/Ni@NCHS exhibits excellent electrocatalytic performance,with 2e- ORR selectivity of 91.3%,H2O2yield of 1.85@0.3 V.Density functional theory simulations and experiments results reveal that the heteroatom doping(O,S)method has been employed to regulate the adsorption strength of Ni atoms with*OOH,and combined with the self-sacrificing template-assisted pyrolysis approach to improve the microstructure of catalysts and optimize the active site.The heteroatom doping method in this work provides significant guidance for promoting 2e- ORR electrocatalysis to produce H2O2. 展开更多
关键词 NiX/Ni@NCHS composite catalyst 2e-oxygen reduction reaction Honeycomb-like porous carbon Density functional theory Electrocatalysis
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Crashworthiness of innovative hexagonal honeycomb-like structures subjected to out-of-plane compression 认领 引用 被引量：12
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作者 WANG Zhong-gang SHI Chong +1 位作者 DING San-san LIANG Xi-feng 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第2期621-628,共8页
Seeking for innovative structures with higher mechanical performance is a continuous target in railway vehicle crashworthiness design.In the present study,three types of hexagonal reinforced honeycomb-like structures ... Seeking for innovative structures with higher mechanical performance is a continuous target in railway vehicle crashworthiness design.In the present study,three types of hexagonal reinforced honeycomb-like structures were developed and analyzed subjected to out-of-plane compression,namely triangular honeycomb(TH),double honeycomb(DH)and full inside honeycomb(FH).Theoretical formulas of average force and specific energy absorption(SEA)were constructed based on the energy minimization principle.To validate,corresponding numerical simulations were carried out by explicit finite element method.Good agreement has been observed between them.The results show that all these honeycomb-like structures maintain the same collapsed stages as conventional honeycomb;cell reinforcement can significantly promote the performance,both in the average force and SEA;full inside honeycomb performs better than the general,triangular and double schemes in average force;meanwhile,its SEA is close to that of double scheme;toroidal surface can dissipate higher plastic energy,so more toroidal surfaces should be considered in design of thin-walled structure.These achievements pave a way for designing high-performance cellular energy absorption devices. 展开更多
关键词 honeycomb-like structure crashworthiness basic fold element structural reinforcement
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Research on the Novel Honeycomb-Like Cabin Based on Computer Simulation 认领 引用
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作者 Yong Wang Yongyan Wang +3 位作者 Songmei Li Nan Qin Peng Du Tongtong Zhou 《Computer Systems Science & Engineering》 SCIE EI 2021年第11期179-195,共17页
The antiknock capability and thermal protection performance of rescue capsules mainly depend on the structural design of the cabin.By designing a new type of cabin structure,it can resist the impact of explosion shock... The antiknock capability and thermal protection performance of rescue capsules mainly depend on the structural design of the cabin.By designing a new type of cabin structure,it can resist the impact of explosion shock waves and thermal shocks.In this paper,a new honeycomb-like cabin is proposed;the model has a novel thermal insulation layer design.Then,the antiknock capabilities and thermal protection analysis are carried out by using computer software.The“Autodyn”analysis module in ANSYS Workbench 17.0 has been used to simulate the explosion of TNT with a certain quality in a single room.The pressure map over time and the pressure variation curve at different locations for a single room are obtained.Through the analysis module“Transient Structural,”the stress and deformation of the honeycomb-like cabin under the blast load are simulated.The“Transient Thermal”analysis module in the finite element software is used to conduct a transient thermal analysis on the cabin structure.The temperature map and the temperature rise curve of each layer of the cabin cases are obtained.The analysis results indicate that the honeycomb-like cabin design has a good antiknock capability and thermal protection performance,and it can meet the usage requirements of the rescue capsule under dangerous conditions. 展开更多
关键词 The rescue capsule computer the honeycomb-like cabin the antiknock ability the thermal protection the thermal insulation layer
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Honeycomb-like MXene/NiFePx–NC with“continuous”single-crystal enabling high activity and robust durability in electrocatalytic oxygen evolution reactions 认领 引用 被引量：15
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作者 Xiaojun Zeng Yifei Ye +3 位作者 Yongqing Wang Ronghai Yu Martin Moskovits Galen D.Stucky 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第3期553-564,共12页
The development of low-cost,stable,and robust non-noble metal catalysts for water oxidation is a pivotal challenge for sustainable hydrogen production through electrocatalytic water splitting.Currently,such catalysts ... The development of low-cost,stable,and robust non-noble metal catalysts for water oxidation is a pivotal challenge for sustainable hydrogen production through electrocatalytic water splitting.Currently,such catalysts suffer from high overpotential and sluggish kinetics in oxygen evolution reactions(OERs).Herein,we report a“continuous”single-crystal honeycomb-like MXene/NiFePx–N-doped carbon(NC)heterostructure,in which ultrasmall NiFePxnanoparticles(NPs)encapsulated in the NC are tightly anchored on a layered MXene.Interestingly,this MXene/NiFePx–NC delivers outstanding OER catalytic performance,which stems from“continuous”single-crystal characteristics,abundant active sites derived from the ultrasmall NiFePxNPs,and the stable honeycomb-like heterostructure with an open structure.The experimental results are rationalized theoretically(by density functional theory(DFT)calculations),which suggests that it is the unique MXene/NiFePx–NC heterostructure that promotes the sluggish OER,thereby enabling superior durability and excellent activity with an ultralow overpotential of 240 mV at a current density of 10 mA×cm−2. 展开更多
关键词 layered MXene ultrasmall NiFePx nanoparticles(NPs) “continuous”single-crystal honeycomb-like heterostructure oxygen evolution reaction(OER)activity
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Porous honeycomb-like C3N4/rGO composite as host for high performance Li-S batteries 认领 引用 被引量：7
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作者 Xiaomeng Bai Chunsheng Wang +4 位作者 Caifu Dong Chuanchuan Li Yanjun Zhai Weiwei Si Liqiang Xu 《Science China Materials》 SCIE EI CAS CSCD 2019年第9期1265-1274,共10页
Lithium-sulfur(Li-S)batteries have attracted extensive attention along with the urgent increasing demand for energy storage owing to the high theoretical specific capacity and energy density,abundant reserves and low ... Lithium-sulfur(Li-S)batteries have attracted extensive attention along with the urgent increasing demand for energy storage owing to the high theoretical specific capacity and energy density,abundant reserves and low cost of sulfur.However,the practical application of Li-S batteries is still impeded due to the low utilization of sulfur and serious shuttle-effect of lithium polysulfides(LiPSs).Here,we fabricated the porous honeycomb-like C3N4(PHCN)through a hard template method.As a polar material,graphitic C3N4has abundant nitrogen content(-58%),which can provide enough active sites to mitigate shuttle-effect,and then conductive reduced graphene oxide(rGO)was introduced to combine with PHCN to form PHCNGO composite in order to improve the utilization efficiency of sulfur.After sulfur loading,the PHCNGO/S cathode exhibited an initial discharge capacity of 1,061.1 mA h g^-1 at 0.2 C and outstanding rate performance at high current density of 5 C(495.1 mA h g-1),and also retained 519 mA h g-1,after 400 cycles at 1 C.Even at high sulfur loading(4.3 mg cm-2),the capacity fade rate was only 0.16%per cycle at 0.5 C for 200 cycles.The above results demonstrate that the special design of PHCNGO composite as sulfur host has high potential application for Li-S rechargeable batteries. 展开更多
关键词 porous honeycomb-like graphitic C3N4 long cycleperformance lithium-sulfur batteries
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Honeycomb-like polyaniline for flexible and folding all-solid-state supercapacitors 认领 引用 被引量：1
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作者 Ge JU Muhammad Arif KHAN +7 位作者 Huiwen ZHENG Zhongxun AN Mingxia WU Hongbin ZHAO Jiaqiang XU Lei ZHANG Salma BILAL Jiujun ZHANG 《Frontiers of Materials Science》 SCIE CSCD 2019年第2期133-144,共12页
Porous polyaniline (PANI) was prepared through an efficient and costeffective method by polymerization of aniline in the NaCl solution at room temperature. The resulting PANI provided large surface area due to its hig... Porous polyaniline (PANI) was prepared through an efficient and costeffective method by polymerization of aniline in the NaCl solution at room temperature. The resulting PANI provided large surface area due to its highly porous structure and the intercrossed nanorod, resulting in good electrochemical performance. The porous PANI electrodes showed a high specific capacitance of 480 F·g^-1, 3 times greater than that of PANI without using the NaCl solution. We also make chemically crosslinked hydrogel film for hydrogel polymer electrolyte as well as the flexible supercapacitors (SCs) with PANI. The specific capacitance of the device was 234 F·g^-1 at the current density of 1 A·g^-1. The energy density of the device could reach as high as 75 W·h·kg^-1 while the power density was 0.5 kW·kg^-1, indicating that PANI be a promising material in flexible SCs. 展开更多
关键词 PANI honeycomb-like nanostructure all-solid-state SC electrochemical property
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Topological transition enabled by composite symmetry-breaking paths in trefoil-knot honeycomb lattices 认领 引用
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作者 Tai REN Xiuhui HOU +3 位作者 Tingting WANG Zhiwei ZHU Kai ZHANG Zichen DENG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第3期497-508,共12页
Topological phases are governed by lattice symmetries,yet how different symmetry-breaking paths(SBPs)affect topological transitions remains insufficiently understood.Most existing studies rely on a single SBP,and addr... Topological phases are governed by lattice symmetries,yet how different symmetry-breaking paths(SBPs)affect topological transitions remains insufficiently understood.Most existing studies rely on a single SBP,and address only one bandgap,limiting independent control of multiple gaps.Here,we investigate multiple isolated Dirac points in a trefoil-knot-modified honeycomb lattice,and show that a single SBP generally inverts all relevant Dirac points simultaneously,whereas the tailored combinations of SBPs enable selective and programmable band inversion at targeted gaps.The excitation-dependent responses reveal strong modal selectivity.This capability is exploited to realize independently controllable multi-channel signal splitting,which is unattainable with a single SBP.The results enable SBPs as an effective design degree of freedom for programmable and reconfigurable topological elastic devices. 展开更多
关键词 symmetry-breaking path(SBP) honeycomb-like metastructure topological metamaterial
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换热器中增强相变材料传热性能的数值模拟研究 认领 引用
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作者 周子翔 李环 +3 位作者 杨娜 卢佳佳 王堘曦 梅贵勇 《智能计算机与应用》 2026年第6期167-173,共7页
为提升相变储热器的传热性能,增强换热圆管到相变材料的热传递,本文基于ANSYS Fluent软件建立仿真模型,采用焓-多孔介质法对相变储热过程进行数值模拟,设计了一款多通道“蜂窝状”管道布置的相变储热装置。研究结果表明,“蜂窝状”的储... 为提升相变储热器的传热性能,增强换热圆管到相变材料的热传递,本文基于ANSYS Fluent软件建立仿真模型,采用焓-多孔介质法对相变储热过程进行数值模拟,设计了一款多通道“蜂窝状”管道布置的相变储热装置。研究结果表明,“蜂窝状”的储热单元结构能够有效增强相变材料的传热速率,从而缩短储热时间,其传热性能提高85.08%;对“蜂窝状”结构进行加装翅片的优化设计,最优的装置结构其传热性能提高91.83%。 展开更多
关键词 储能 相变储热 蜂窝状 翅片
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蜂巢式双层壁冷却结构减阻优势研究 认领 引用
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作者 徐宁宁 吕东 +2 位作者 孔星傲 乐鑫灿 王奉明 《航空动力学报》 EI CAS CSCD 北大核心 2025年第5期245-255,共11页
高冷效涡轮叶片需要采用双层壁冷却结构,但已有大量研究表明其冷气流动阻力过大,导致该类结构应用困难。为改善这一问题,一种蜂巢式双层壁冷却结构已经被提出。基于自研的小型风洞实验系统和3D打印制备的实验件,在常温常压工况下对两种... 高冷效涡轮叶片需要采用双层壁冷却结构,但已有大量研究表明其冷气流动阻力过大,导致该类结构应用困难。为改善这一问题,一种蜂巢式双层壁冷却结构已经被提出。基于自研的小型风洞实验系统和3D打印制备的实验件,在常温常压工况下对两种双层壁结构进行了流阻对比实验。结果表明在相同的结构准则参数和来流雷诺数下,蜂巢式结构的总压损失比典型层板减少了20.5%~22.5%,总压恢复系数提高了最多1.4%;同时对实验过程进行了仿真复现,进一步明晰了该结构可有效组织气流和抑制多类旋涡的减阻机理。通过对实验结果的不确定性分析,以及实验与仿真结果的相互印证,表明了所得结论的可信性。 展开更多
关键词 涡轮叶片 蜂巢式冷却 双层壁结构 流动阻力 风洞实验
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Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption 认领 引用 被引量：22
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作者 Xinci Zhang Yanan Shi +5 位作者 Jia Xu Qiuyun Ouyang Xiao Zhang Chunling Zhu Xiaoli Zhang Yujin Chen 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第2期107-123,共17页
Atomically dispersed metals on N-doped carbon supports(M-NxCs) have great potential applications in various fields.However,a precise understanding of the definitive relationship between the configuration of metal s... Atomically dispersed metals on N-doped carbon supports(M-NxCs) have great potential applications in various fields.However,a precise understanding of the definitive relationship between the configuration of metal single atoms and the dielectric loss properties of M-NxCs at the atomic-level is still lacking.Herein,we report a general approach to synthesize a series of three-dimensional(3D)honeycomb-like M-N_xC(M=Mn,Fe,Co,Cu,or Ni) containing metal single atoms.Experimental results indicate that 3D M-NxCs exhibit a greatly enhanced dielectric loss compared with that of the NC matrix.Theoretical calculations demonstrate that the density of states of the d orbitals near the Fermi level is significantly increased and additional electrical dipoles are induced due to the destruction of the symmetry of the local microstructure,which enhances conductive loss and dipolar polarization loss of 3D M-NxCs,respectively.Consequently,these 3D M-NxCs exhibit excellent electromagnetic wave absorption properties,outperforming the most commonly reported absorbers.This study systematically explains the mechanism of dielectric loss at the atomic level for the first time and is of significance to the rational design of high-efficiency electromagnetic wave absorbing materials containing metal single atoms. 展开更多
关键词 Metal single atoms Dielectric loss behavior NaCl-templating method Lightweight absorbers Honeycomb-like N-doped nanocarbons
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Labyrinth maze-like long travel-reduction of sulfur and polysulfides in micropores of a spherical honeycomb carbon to greatly confine shuttle effects in lithium-sulfur batteries 认领 引用 被引量：3
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作者 Yanyan Chang Jie Chen +8 位作者 Zhuo Zou Juan Li Chao Wu Yali Jiang Yue Chen Qingxin Zeng Xiaoshui Wu Wei Sun Chang Ming Li 《Materials Reports(Energy)》 2022年第4期54-61,共8页
Polysulfide absorption in a micropore-rich structure has been reported to be capable of efficiently confining the shuttle effect for high-performance lithium-sulfur(Li–S)batteries.Here,a labyrinth maze-like spherical... Polysulfide absorption in a micropore-rich structure has been reported to be capable of efficiently confining the shuttle effect for high-performance lithium-sulfur(Li–S)batteries.Here,a labyrinth maze-like spherical honeycomb-like carbon with micropore-rich structure was synthesized,which is employed as a template host material of sulfur to study the shuttle effects.The results strongly confirm that a diffusion controlled process rather than an absorption resulted surface-controlled process occurs in an even micropore-rich cathode but still greatly inhibits the shuttle effect.Thus,the battery achieves a high initial discharge specific capacity of 1120 mAh g1 at 0.25 C and super cycling stability for 1635 cycles with only 0.035%capacity decay per cycle with 100%Coulombic efficiency.We would like to propose a new mechanism for shuttle effect inhibition in micropores.In terms of the diffusion control process in microporous paths of a labyrinth maze structure,polysulfides experience a long travel to realize continuous reductions of sulfur and polysulfides until formation of the final solid product.This efficiently prevents the polysulfides escaping to electrolyte.The labyrinth maze-like honeycomb structure also offers fast electron transfer and enhanced mass transport as well as robust mechanical strength retaining intact structure for long cycle life.This work sheds lights on new fundamental insights behind the shuttle effects with universal significance while demonstrating prominent merits of a robust labyrinth maze-like structure in high performance cathode for high-performance Li–S batteries. 展开更多
关键词 Lithium-sulfur batteries Labyrinth maze-like spherical honeycomb-like carbon Diffusion-controlled process Shuttle effects High performance
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金属多级类蜂窝的压溃行为研究 认领 引用 被引量：11
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作者 夏元明 张威 +5 位作者 崔天宁 张建勋 王彬文 刘小川 白春玉 秦庆华 《力学学报》 EI CAS CSCD 北大核心 2019年第3期873-883,共11页
通过实验和数值模拟方法系统研究了单胞壁开孔金属多级类蜂窝与双胞壁开孔金属多级类蜂窝的压溃行为.重点分析了试件尺寸、开孔位置、孔偏距和孔梯度等因素对多级类蜂窝力学性能的影响.结果表明,多级类蜂窝的压溃过程可分为3个阶段:弹... 通过实验和数值模拟方法系统研究了单胞壁开孔金属多级类蜂窝与双胞壁开孔金属多级类蜂窝的压溃行为.重点分析了试件尺寸、开孔位置、孔偏距和孔梯度等因素对多级类蜂窝力学性能的影响.结果表明,多级类蜂窝的压溃过程可分为3个阶段:弹性变形、屈曲变形以及密实;单胞壁开孔多级类蜂窝的压溃过程趋向于渐近内凹压溃,而双胞壁开孔多级类蜂窝趋向于轴向压溃;试件尺寸对多级类蜂窝的力学行为有明显的影响,当胞元数达到一定数目时,其力学性能几乎与蜂窝胞元数无关.单胞壁开孔多级类蜂窝的峰值应力大于双胞壁开孔多级类蜂窝的峰值应力,但其平均压溃应力小于双胞壁开孔多级类蜂窝的平均压溃应力;与传统蜂窝相比,蜂窝胞壁开孔设计降低了蜂窝材料的比吸能;孔偏距的存在导致单胞壁开孔多级类蜂窝的峰值应力降低,但随着孔偏距的增加其平均压溃应力呈先减低后增加趋势;多梯度孔设计对多级类蜂窝材料的力学性能有重要影响,与均匀孔多级类蜂窝相比,正梯度孔分布设计降低了多级类蜂窝峰值应力,但提高了其平均压溃应力;多梯度孔分布设计对多级类蜂窝的峰值应力和平均压溃应力影响不大. 展开更多
关键词 多级类蜂窝 压溃 变形模式 穿孔 孔梯度
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蜂窝状多孔316L不锈钢的选区激光熔化制备 认领 引用 被引量：8
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作者 王志阳 沈以赴 +1 位作者 顾冬冬 于秀平 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2011年第1期161-164,共4页
对含预合金316L不锈钢和NH4HCO3（质量比96：4）的混合粉末进行选区激光熔化,制备多孔材料的实验研究。利用扫描电镜分析试样的微观孔隙特征。结果表明,在较高激光功率（800W）条件下,可形成蜂窝状的多孔结构,孔径分布均匀（2~5μm）,... 对含预合金316L不锈钢和NH4HCO3（质量比96：4）的混合粉末进行选区激光熔化,制备多孔材料的实验研究。利用扫描电镜分析试样的微观孔隙特征。结果表明,在较高激光功率（800W）条件下,可形成蜂窝状的多孔结构,孔径分布均匀（2~5μm）,平均孔径约3.5μm。分析激光功率对多孔结构特征的影响,讨论选区激光熔化蜂窝状多孔结构的形成机制。 展开更多
关键词 316L不锈钢 蜂窝状多孔结构 选区激光熔化 微观组织 孔隙率
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