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A flexible,thin-film microchannel electrode array device for selective subdiaphragmatic vagus nerve recording

Microsystems & Nanoengineering 2024年第1期10卷 115-128页

作者： Jongcheon Lim Peter A.Zoss Terry L.Powley Hyowon Lee Matthew P.Ward Weldon School of Biomedical Engineering Purdue UniversityWest LafayetteINUSA Birck Nanotechnology Center Purdue UniversityWest LafayetteINUSA Center for Implantable Devices Purdue UniversityWest LafayetteINUSA Department of Psychological Sciences Purdue UniversityWest LafayetteINUSA Purdue Institute of Integrative Neuroscience Purdue UniversityWest LafayetteINUSA Indiana University School of Medicine IndianapolisINUSA

The vagus nerve(VN)plays an important role in regulating physiological conditions in the gastrointestinal(GI)tract by communicating via the parasympathetic pathway to the enteric nervous system(ENS).However,the lack of knowledge in the neurophysiology of the VN and GI tract limits the development of advanced treatments for autonomic dysfunctions related to the VN.To better understand the complicated underlying mechanisms of the VN-GI tract neurophysiology,it is necessary to use an advanced device enabled by microfabrication technologies.Among several candidates including intraneural probe array and extraneural cuff electrodes,microchannel electrode array devices can be used to interface with smaller numbers of nerve fibers by securing them in the separate channel structures.Previous microchannel electrode array devices to interface teased nerve structures are relatively bulky with thickness around 200µm.The thick design can potentially harm the delicate tissue structures,including the nerve itself.In this paper,we present a flexible thin film based microchannel electrode array device(thickness:11.5µm)that can interface with one of the subdiaphragmatic nerve branches of the VN in a rat.We demonstrated recording evoked compound action potentials(ECAP)from a transected nerve ending that has multiple nerve fibers.Moreover,our analysis confirmed that the signals are from C-fibers that are critical in regulating autonomic neurophysiology in the GI tract.

关键词： electrode recording film

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electrode design using revolving entity extraction for high-efficiency electric discharge machining of integral shrouded blisk

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Chinese Journal of Aeronautics 2021年第6期34卷 178-187页

作者： Yuchao JIA Guanxin CHI Yang SHEN Kun ZHANG Zhenlong WANG Yukui WANG School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001China Capital Aerospace Machinery Company China Academy of Launch Vehicle TechnologyBeijing 100076China

The integral shrouded blisk provides better performance with minimum weight,but its semi-open structure presents problems for its production.Manufacturing processes of these components require a removal of about 70%-90%of material from their blanks.Multi-axis electrical discharge machining(EDM)is commonly used for these processes,but its poor efficiency cannot meet the requirements of mass production.Strong flushing assisted high-current discharge is able to improve the machining efficiency.In this paper,this method was applied to manufacture the integral shrouded blisk.An electrode design method was proposed.Taking the largest revolving entity inside the flow channel as the base geometry,this laminated arc-shaped hollow electrode meets the requirements such as high pressure flushing,tool wear compensation,and easy to be made.A 4-axis linkage machining tool path with planetary motion was proposed.Taking an integral guide vane ring as an example,it has been experimentally verified that the time consumption for each channel using this method was reduced to a half of the ordinary EDM method,while the finished surface quality remains same.

关键词： EDM electrode High efficiency Trajectory Turbine blades

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Recent advances and influencing parameters in developing electrode materials for symmetrical solid oxide fuel cells

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矿物冶金与材料学报:英文版 2023年第10期30卷 1933-1956页

作者： Wan Nor Anasuhah Wan Yusoff Nurul Akidah Baharuddin Mahendra Rao Somalu Andanastuti Muchtar Nigel P.Brandon Huiqing Fan Solid Oxide Fuel Cell Group Fuel Cell InstituteUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Mechanical and Manufacturing Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Faculty of Engineering 2.06 Faculty BuildingImperial College LondonSW72 AZUK State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

This article delivers a robust overview of potential electrode materials for use in symmetrical solid oxide fuel cells(S-SOFCs),a relatively new SOFC technology.To this end,this article provides a comprehensive review of recent advances and progress in electrode materials for S-SOFC,discussing both the selection of materials and the challenges that come with making that choice.This article discussed the relevant factors involved in developing electrodes with nano/microstructure.Nanocomposites,e.g.,non-cobalt and lithiated materials,are only a few of the electrode types now being researched.Furthermore,the phase structure and microstructure of the produced materials are heavily influenced by the synthesis procedure.Insights into the possibilities and difficulties of the material are discussed.To achieve the desired microstructural features,this article focuses on a synthesis technique that is either the most recent or a better iteration of an existing process.The portion of this analysis that addresses the risks associated with manufacturing and the challenges posed by materials when fabricating S-SOFCs is the most critical.This article also provides important and useful recommendations for the strategic design of electrode materials researchers.

关键词： nano composites electrode microstructure tailoring oxidation symmetrical solid oxide fuel cell

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Fabricating sustainable lignin-derived porous carbon as electrode for high-performance supercapacitors

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Frontiers of Chemical Science and Engineering 2023年第8期17卷 1065-1074页

作者： Wei Liu Zhikun Li Ranran Sang Jinsong Li Xueping Song Qingxi Hou Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanning 530004China Tianjin Key Laboratory of Pulp&Paper Tianjin University of Science&TechnologyTianjin 300457China Mudanjiang Hengfeng Paper Co. Ltd.Mudanjiang 157013China

Lignocellulosic biomass such as plants and agricultural waste are ideal to tackle the current energy crisis and energy-related environmental issues.Carbon-rich lignin is abundant in lignocellulosic biomass,whose high-value transformation and utilization has been the most urgent problem to be solved.Herein,we propose a method for the preparation of porous carbon from lignin employing an H_(3)PO_(4)-assisted hydrothermal method.We characterize the as-prepared lignin-derived porous carbon and investigate its potential for energy storage.After assisted hydrothermal treatment followed by carbonization at 800℃,the lignin-derived porous carbon displays a high specific capacitance(223.6 F·g^(–1) at 0.1 A·g^(–1))and excellent cycling ability with good capacitance retention.In this present study,the resultant lignin-derived porous carbon was used as the electrode of a supercapacitor,illustrating yet another potential high-value use for lignin,namely as a candidate for the sustainable fabrication of main supercapacitor components.

关键词： lignin porous carbon electrode supercapacitor

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In-situ growth of TiO_(2)film on carbonized eggshell membrane as 3D electrode for high-performance lithium storage

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Green Energy & Environment 2022年第3期7卷 485-491页

作者： Xiao Yu Xinyi Zhang Yongjian Lai Donghai Wang Yong Liu School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen UniversityGuangzhou510275China School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou510275China

3D electrodes have shown extraordinary promise for electrochemical energy storage devices in wearable electronics.However,it is still a significant challenge to rationally design 3D electrode that has the characteristics of lightweight,flexibility,low cost,high performance and miniaturization.In this work,we present a novel design of 3D electrode by directly growing the nanocrystalline TiO_(2) film on carbonized eggshell membrane.The unique architecture can supply not only a continuous electron transport pathway through an interconnected carbon fibrous network but also an efficient electrolyte flux via an interpenetrating porous network.Besides,nanocrystalline TiO_(2) film on carbonized eggshell membrane offers a short ion diffusion path in the solid-phase,leading to a rapid kinetic of electrochemical reaction.When tested as an anode for Li-ion battery,TiO_(2) film in 3D electrode demonstrated excellent electrochemical performance with a large reversible capacity,excellent rate capacity and long life cycling property.

关键词： property reaction electrode

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Stabilizing charge storage of Fe_(2)O_(3)-based electrode via phosphate ion functionalization for long cycling life

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Rare Metals 2023年第1期42卷 39-46页

作者： Li-Ming Wan Qiu-Ying Xia Jiang-Hua Wu Jing Liu Zheng-Yi Shi Si Lan Teng Zhai Serguei V.Savilov Sergey M.Aldoshin Hui Xia Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Chemistry M.V.Lomonosov Moscow State UniversityMoscow119991Russian Federation Faculty of Fundamental Physical and Chemical Engineering M.V.Lomonosov Moscow State UniversityMoscow119991Russian Federation

Compositing metal oxides with nanostructured carbon or conductive polymer supports has been regarded as a compelling way to develop electrode materials with enhanced energy density as well as large power in supercapacitors.Yet,the corresponding cycling stability is still greatly limited due to the intrinsic dissolution of metal oxide nanostructures during redox processes.Herein,phosphate ions modified Fe_(2)O_(3) nanoparticles composited with hollow carbon nanosheet arrays have been synthesized as desirable electrodes with both significantly expanded lifespan and high pseudocapacitance.

关键词： electrode expanded charge

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Pore-Scale Investigation of Coupled Two-Phase and Reactive Transport in the Cathode electrode of Proton Exchange Membrane Fuel Cells

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Transactions of Tianjin University 2023年第1期29卷 1-13页

作者： Shengjie Ye Yuze Hou Xing Li Kui Jiao Qing Du State Key Laboratory of Engines Tianjin University135 Yaguan RoadTianjin 300350China

A three-dimensional multicomponent multiphase lattice Boltzmann model(LBM)is established to model the coupled two-phase and reactive transport phenomena in the cathode electrode of proton exchange membrane fuel cells.The gas diff usion layer(GDL)and microporous layer(MPL)are stochastically reconstructed with the inside dynamic distribution of oxygen and liquid water resolved,and the catalyst layer is simplifi ed as a superthin layer to address the electrochemical reaction,which provides a clear description of the fl ooding eff ect on mass transport and performance.Diff erent kinds of electrodes are reconstructed to determine the optimum porosity and structure design of the GDL and MPL by comparing the transport resistance and per-formance under the fl ooding condition.The simulation results show that gradient porosity GDL helps to increase the reactive area and average concentration under fl ooding.The presence of the MPL ensures the oxygen transport space and reaction area because liquid water cannot transport through micropores.Moreover,the MPL helps in the uniform distribution of oxygen for an effi cient in-plane transport capacity.Crack and perforation structures can accelerate the water transport in the assembly.The systematic perforation design yields the best performance under fl ooding by separating the transport of liquid water and oxygen.

关键词： Proton exchange membrane fuel cell Lattice Boltzmann model electrode Water management Two-phase fl ow Reactive transport

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Bridging the microstructural evolutions from slurry to porous electrode of a lithium-ion battery

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Journal of Energy Chemistry 2023年第9期84卷 329-334页

作者： Hamid Hamed Zoleikha Mirzaie Alamooti Ashutosh Agrawal Jan D'Haen An Hardy Mohammadhosein Safari Institute for Materials Research(IMO-imomec) UHasseltMartelarenlaan 42B-3500 HasseltBelgium Energyville Thor Park 8320B-3600 GenkBelgium IMEC Division IMOMEC BE-3590Belgium

1. Introduction The porous electrodes are the crucial components of the modern electrochemical devices including lithium-ion batteries. The detailed configuration of the lithium-insertion, carbon black, and PVDF binder particles in a typical electrode of a lithium-ion cell has a significant impact on its energy and power density. A thinner electrode is desired to decrease the battery volume particularly for portable electronics and mobility applications.

关键词： density. lithium electrode

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Dividing and setting strategy of improving calculation efficiency for needle electrode corona discharge with a large-scale space

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High Voltage 2022年第3期7卷 429-438页

作者： Dingchen Li Chuan Li Jiawei Li Pengyu Wang Zhi Liu Wendi Yang Ming Zhang Yong Yang Kexun Yu International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhanChina Digital Grid Research Institute of China Southern Power Grid GuangzhouChina Zhuzhou CRRC Times Electric Co. Ltd.(TEC)ZhuzhouChina

Needle electrodes are widely used in the research of corona discharge.Aiming at the problem of needle electrode discharge in a large-scale space(tens or even hundreds of centimetres),a hybrid model was proposed in the previous work.However,its indis-pensable multiple iterations result in huge computation and further limit its wide appli-cations.Therefore,a strategy to improve the computing efficiency by setting initial values in different computational domains is put forward in this work.Three types of setting initial values(global constant,partition constant and partition exponent)are simulated and compared in detail.The calculation results show that the calculation efficiency can be increased by 1.4 times simply through setting initial values of charged particles as different constants for the divided subdomains,and further be improved by 4.3 times by setting those in the ionization region as an exponential distribution.The extension of the pro-posed strategy has also been discussed under various voltages,which shows that the results under other voltages can be quickly obtained based on the fitted coefficients under a specific voltage,and the improvement can reach up to 10 times.The accuracy of calculated results has been demonstrated by a needle-plate electrode device with a vertical distance of 25 cm.This research provides an effective strategy for improving the computing efficiency of corona discharge in a large-scale space,and implies the potential in optimizing the analyses of complex electrodes.

关键词： electrode calculation partition

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Construction of Desirable NiCoTe_(2) Nanosheet Arrays on a Carbon Cloth Substrate as a Positive electrode Material for a High-Performance Asymmetric Supercapacitor

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Transactions of Tianjin University 2022年第2期28卷 153-161页

作者： Mi Xiao Meilian Zhao Tianrui Wang Tingwu Zhao Xu Niu Key Laboratory of the Ministry of Education on Smart Power Grids School of Electrical and Information EngineeringTianjin UniversityTianjin 300072China

Nickel–cobalt tellurides are deemed as promising electrode materials for energy storage devices due to their superior conductivity and theoretical specific capacitance.Here,NiCoTe_(2)was successfully fabricated on carbon cloth by facile electrodeposition and hydrothermal synthesis,which can directly serve as a binderless electrode.The NiCoTe_(2)with interconnected nanosheet arrays on a conductive carbon substrate showed a high specific capacitance(924 F/g at 1 A/g)and robust longterm cycling stability(89.6%retention after 5000 cycles).In addition,the assembled NiCoTe_(2)//activiated carbon hybrid supercapacitor achieved a high energy and power density with a short charging time(42.26 Wh/kg at a power density of 760.96 W/kg).This work provides a novel idea to produce bimetallic nickel–cobalt telluride nanosheet array electrodes for high-performance hybrid supercapacitors.

关键词： NiCoTe_(2) Hydrothermal Telluride Supercapacitor electrode Asymmetric capacitor

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