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Microstructuring Conductive Electrospun Mats for Enhanced Electro‑active Biofilm Growth and High‑Performance Bioelectrocatalysis

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advanced Fiber materials 2023年第5期5卷 1699-1711页

作者： Min Li Hao Lu Jiadong Hu Xuemei Xiang Yanling Zheng Wenhu Gao Wei Sun Wei Wang Zhisong Lu Yan Qiao Institute for Clean Energy and Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Sino‑Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Experimental Center for Virtual Simulation of Sports and Health Southwest UniversityChongqing 400715People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University TechnologyWuhan 430070People’s Republic of China Hubei Longzhong Lab Xiangyang 441000People’s Republic of China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158People’s Republic of China Singapore Institute of Manufacturing Technology Singapore 138669Singapore

Electrospun materials have attracted considerable attention in microbial fuel cells(MFC)owing to their porous structures,which facilitate the growth of electro-active biofilms(EABs).However,the impact of fiber diameter-controlled porous architectures on EAB growth and MFC performance has not been extensively ***,a highly conductive polypyrrole-modified electrospun polyacrylonitrile(PAN)mat was prepared as an electrode material for Shewanella putrefaciens CN32-based *** dominant pore size of the corresponding mat increases from 1 to around 20μm as the fiber diameter increases from 720 to 3770 *** variation affects the adhesion and growth behaviors of electrochemically active bacteria on the mat-based *** electrodes with poresranging from 2 to 10μm allow bacterial penetration into the interior,leading to significant biofilm loading and effective ***,the tight lamination of the electrospun fibers restricts bacterial growth in the deep interior *** developed a friction-induced triboelectric expanding approach to rendering the mats with layered structures to overcome this *** inter-layer spaces of the expanded conductive mat can facilitate bacterial loading from both sides of each layer and serve as channels to accelerate the catalysis of organic ***,the expanded conductive mat with appropriate pore sizes delivers superior bioelectrocatalytic performance in MFCs and dye *** on the findings,a mechanism for the porous structure-controlled EAB formation and bioelectrocatalytic performance was *** work may provide helpful guidance and insights for designing microfiber-based electrodes for microbial fuel cells.

关键词： Electrospun mat Porous structure Bioelectrocatalysis Microbial fuel cells Polypyrrole

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Spallation Damage Mechanisms and Microstructural Evolution in Selective Laser Melted Ti-6al-4v Under Quasi-Isentropic Loading

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SSRN 2024年

作者： Zhang, Kaichang Li, Peibo Zhang, Yang Sun, Yi Luo, Guoqiang Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The microstructure of additively manufactured Ti-6Al-4V significantly differs from that of traditional casting processes, and this microstructural variation directly impacts the material's mechanical properties. To ensure the safety and stability of additively manufactured Ti-6Al-4V in practical applications, this study achieves controlled dynamic loading by optimizing the cross-sectional surface density of the structural gradient flyer(SGFs). It further explores material response characteristics under varying stress and strain rates by adjusting the loading rate in spallation experiments. The initial microstructure of Ti-6Al-4V produced via selective laser melting (SLM) was investigated and analyzed. Quasi-isentropic loading experiments were conducted on 6 mm thick samples at strain rates ranging from 5.07 to 12.38 × 104 s-1. The results demonstrate that, in comparison to as-cast alloys, the SLM-processed Ti-6Al-4V alloys exhibit reduced plasticity, primarily attributed to the higher cooling rates of SLM. The alloys predominantly display brittle fracture characteristics, with distinct transgranular fracture patterns. As the loading strain rate increases, the pulse width of the loading waveform progressively narrows, spall strength markedly rises, and cracks not only propagate but also enlarge. Grain refinement was evident in both the crack extension region and along the edges, accompanied by localized stress concentration, yet no signs of recrystallization were detected. The spall strength of the material exhibited heightened sensitivity to impact stresses relative to plate impact conditions. These findings offer critical theoretical insights into the potential applications of additively manufactured titanium alloys, particularly in aerospace and defense sectors. © 2024, The Authors. All rights reserved.

关键词： Grain refinement

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高效多孔碳基催化剂的研究进展及其在锌空气电池中应用

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Science China materials 2023年第9期66卷 3381-3400页

作者：蔡世昌安宇冯亚刚段磊张寒露张猛吴佳宾唐浩林 School of Materials Science and Engineering Henan University of TechnologyZhengzhou 450001China Department of Chemistry Tsinghua UniversityBeijing 100084China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryXianhu Hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

近年来,能源短缺问题日益突出,传统化石燃料使用过程中排放的二氧化碳大大加剧了全球变暖.锌空气电池作为一种新型能源,由于其低成本、高比能量密度、高安全性和环境友好等优点而受到广泛关注.然而,锌空气电池的发展速度缓慢,一个主要... 详细信息

近年来,能源短缺问题日益突出,传统化石燃料使用过程中排放的二氧化碳大大加剧了全球变暖.锌空气电池作为一种新型能源,由于其低成本、高比能量密度、高安全性和环境友好等优点而受到广泛关注.然而,锌空气电池的发展速度缓慢,一个主要原因是阴极空气催化剂的催化效率低和稳定性差.本文总结了用于空气阴极的多孔碳基催化剂的最新研究进展.在对锌空气电池进行简要介绍后,从孔结构和杂原子掺杂两方面介绍了碳载体的结构和组成.根据孔径大小:微孔、介孔和大孔,详细介绍了锌空气电池中多孔碳的设计和制备.此外,还根据氮、氟、硫、磷和硼等杂原子类别,分别讨论了杂原子掺杂的合成策略以及相应电池性能.最后,本文对锌空气电池未来发展过程中的挑战和机遇进行了展望.

关键词：锌空气电池碳载体能源短缺问题碳基催化剂化石燃料杂原子掺杂多孔碳新型能源

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Significant capacitance enhancement induced by cyclic voltammetry in pine needle-like Ni-Co-Cu multicomponent electrode

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Journal of materials Science & technology 2021年第19期78卷 100-109页

作者： Liqianyun Xu Liuyang Zhang Bei Cheng Jiaguo Yu Ahmed A.Al-Ghamdi S.Wageh State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou.450001China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia

Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor ***,simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably *** discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated *** areal capacitance of the treated sample rockets up to 6.13 F cm^(-2)at 2 m A cm^(-2),almost 13 times higher than the untreated ***,the resistance is substantially reduced by cyclic voltammetry ***,the Coulombic efficiency and stability are concurrently *** reasons behind this treatment are mulled over and reasonable hypothesis is *** study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.

关键词： Cyclic voltammetry Ni-Co-Cu ternary composite Ion exchange Supercapacitor

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Taming the Anchor and Conversion of Polyselenides with a Self-Reinforcing Host in Lithium–Selenium Batteries

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SSRN 2024年

作者： Li, Hongyan Dong, Wen-Da Cao, Yueqiang Barakat, Tarek Laboureur, Marvin Ran, Mao-Jin Hu, Zhi-Yi Zhang, Hongxian Jin, Cheng-Bin Li, Yu Su, Bao-Lian College of Materials and Chemistry China Jiliang University Hangzhou310018 China University of Namur NamurB-5000 Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430074 China State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Energy-dense lithium–selenium (Li–Se) batteries have attracted increasing attention, while their practical application is still hindered, highly relating to the volume expansion and low conductivity of Se and shuttle of Li polyselenides (LiPSes). Herein, a concurrent anchoring/converting strategy is proposed to restrain the dissolution and realize the rapid conversion of LiPSes. A prototypical regulator comprises of polar catalysts embedded in the interconnected porous muti-walled carbon network (i.e., CoSnO3 nanocubes/CNTs), which promises fast electron/ion transportation and inhibits volumetric effect. Moreover, CoSnO3 as redox accelerator promotes the bidirectional conversion of polyselenides by chemical adsorption and decreasing the reaction energy barrier. Consequently, the self-reinforcing optimized cathode exhibits superior initial capacity of 730 mAh g−1, greatly enlarged capacity after 200 cycles (increase by ~32%), and superior rate capacity (153 mAh g−1 at 2 C). This work uncovers the roles of electronic/ionic conductivity and adsorption/catalysis in Li–Se batteries, providing a guidance for taming the utilization and kinetics of cathode from material perspectives. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 356-362页

作者： GAO Jiancheng WANG Dangqiang LEI Liwen ZHANG Fan ZHANG Jinyong FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder *** fully dense (98.6%) materials were obtained at 1700℃ under a pressure of *** to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 *** of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was ***,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.

关键词： hot-pressing high-pressure sintering densification TiB2-B4C

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Electrolyte Engineering Toward High-Voltage Aqueous Energy Storage Devices

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Energy & Environmental materials 2021年第3期4卷 302-306页

作者： Jianfeng Tan Jinping Liu School of Chemistry Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China State Center for International Cooperation on Designer Low-carbon&Environmental Materials and School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Aqueous electrochemical energy storage(EES)devices are highly safe,environmentally benign,and inexpensive,but their operating voltage and energy density must be increased if they are to efficiently power multifunctional electronics,new-energy cars as well as to be used in smart *** Minireview summarizes the key breakthroughs and progress in expanding the electrochemical stability window(ESW)of aqueous EES devices over the past five *** briefly introducing the electrode engineering ways to widen ESW,we focus on four ground-breaking electrolyte engineering strategies and classify them into two kinds from the perspective of salts and exotic solutes/*** widening degree toward ESW of these emerging electrolytes is compared and the universal fundamental mechanism relating to the interactions between limited water molecules and high-concentration salts(or large amounts of exotic solutes/solvents)is *** challenges and perspectives for high-ESW electrolytes as well as recent advances in low-cost and other metal ion(sodium,potassium,zinc,etc.)-based electrolytes for expanding ESW are also outlined.

关键词： aqueous energy storage systems electrolyte engineering high voltage high-energy density water electrolysis

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Rational design of hierarchically porous Fe-N-doped carbon as efficient electrocatalyst for oxygen reduction reaction and Zn-air batteries

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Nano Research 2021年第12期14卷 4768-4775页

作者： Zihan Meng Neng Chen Shichang Cai Jiawei Wu Rui Wang Tian Tian Haolin Tang Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Material Science and Engineering Henan University of TechnologyZhengzhou450001China

The rational design and construction of hierarchically porous nanostructure for oxygen reduction reaction (ORR) electrocatalysts is crucial to facilitate the exposure of accessible active sites and promote the mass/electron transfer under the gas-solid-liquid triple-phase condition. Herein, an ingenious method through the pyrolysis of creative polyvinylimidazole coordination with Zn/Fe salt precursors is developed to fabricate hierarchically porous Fe-N-doped carbon framework as efficient ORR electrocatalyst. The volatilization of Zn species combined with the nanoscale Kirkendall effect of Fe dopants during the pyrolysis build the hierarchical micro-, meso-, and macroporous nanostructure with a high specific surface area (1,586 m^(2)·g^(−1)), which provide sufficient exposed active sites and multiscale mass/charge transport channels. The optimized electrocatalyst exhibits superior ORR activity and robust stability in both alkaline and acidic electrolytes. The Zn-air battery fabricated by such attractive electrocatalyst as air cathode displays a higher peak power density than that of Pt/C-based Zn-air battery, suggesting the great potential of this electrocatalyst for Zn-air batteries.

关键词： hierarchically porous structure Fe-N-doped carbon electrocatalysts oxygen reduction reaction Zn-air batteries

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Operating conditions combination analysis method of optimal water management state for PEM fuel cell

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Green Energy and Intelligent Transportation 2023年第4期2卷 28-42页

作者： Wenxin Wan Yang Yang Yang Li Changjun Xie Jie Song Zhanfeng Deng Jinting Tan Ruiming Zhang School of Automation Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan430070China Department of Electrical Engineering Chalmers University of TechnologyGothenburg41258Sweden Modern Industry College of Artificial Intelligence and New Energy Vehicles Wuhan University of TechnologyWuhan430070China Global Energy Interconnection Research Institute Beijing102211China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Guangdong Hydrogen Energy Institute of Wuhan University of Technology Foshan528000China

The water content of proton exchange membrane fuel cells(PEMFCs)affects the transport of reactants and the conductivity of the *** water management measures can improve the performance and extend the lifespan of the fuel *** water management state of the stack is influenced by various external operating conditions,and optimizing the combination of these conditions can improve the water management state within the *** that the stack's internal resistance can reflect its water management state,this study first establishes an internal resistance-operating condition model that considers the coupling effect of temperature and humidity to determine the variation trend of total resistance and stack humidity with single-factor operating ***,the water management state optimization method based on the ANN-HGPSO algorithm is proposed,which not only quantitatively evaluates the influence weights of different operating conditions on the stack's internal resistance but also efficiently and accurately obtains the optimal combination of five operating conditions:working temperature,anode gas pressure,cathode gas pressure,anode gas humidity,and cathode gas humidity to achieve the optimal water management state in the stack,within the entire range of current ***,the response surface experimental results of the stack also validate the effectiveness and accuracy of the ANN-HGPSO *** method mentioned in this article can provide effective strategies for efficient water management and output performance optimization control of PEMFC stacks.

关键词： PEMFC Water management statue Internal resistance-operating condition model Operating condition optimization Response surface method

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三维分级复合固态电解质用于增强全固态锂金属电池界面相容性

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Science China materials 2023年第2期66卷 522-530页

作者：吴梦君宋江平朱欣欣詹慧田甜王锐雷家珩唐浩林 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Chemistry School of ChemistryChemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China

复合固体电解质结合了聚合物固体电解质和无机固态电解质的优势,被认为是用于高能量密度全固态锂金属电池最有前景的电解质.但是,电极/电解质界面相容性差以及填料团聚阻碍了复合固态电解质的实用化进程.为解决上述问题,本文利用硅烷偶... 详细信息

复合固体电解质结合了聚合物固体电解质和无机固态电解质的优势,被认为是用于高能量密度全固态锂金属电池最有前景的电解质.但是,电极/电解质界面相容性差以及填料团聚阻碍了复合固态电解质的实用化进程.为解决上述问题,本文利用硅烷偶联剂(KH570)修饰Li_(6.4)La_(3)Zr_(2)Al_(0.2)O_(12)(KH@LLZO),通过原位聚合得到三维分级结构复合固态电解质.电解质中填料(KH@LLZO)含量高(80 wt%)的一侧提供刚性的屏障来抑制锂枝晶的生长;填料含量低(8 wt%)的一侧具有最优的离子电导率,赋予电池体系高效的锂离子传输.得益于电解质独特的分级结构,采用该电解质组装得到的对称锂电池具有0.9 mA cm^(-2)的临界电流密度,并且在0.3 mA h cm^(-2)的面容量下稳定循环超过600 h.组装的Li|LiFePO_(4)电池也展现了长循环稳定性(0.5 C电流密度下循环200圈,容量保持率为91.6%).此外,组装得到的软包电池表现出优异的柔韧性和安全性.本研究提出的采用表面修饰填料(KH@LLZO)构筑得到的分级结构复合固态电解质,为开发无枝晶、高性能全固态锂金属电池开辟了一条新途径.

关键词：固态电解质临界电流密度聚合物固体电解质分级结构离子电导率锂电池界面相容性复合固体电解质

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