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Critical importance of current collector property to the performance of Flexible electrochemical power sources

Chinese Chemical Letters 2019年第6期30卷 1282-1288页

作者： Fandi Ning Yangbin Shen Chuang Bai Jun Wei Guanbin Lu Yi Cui Xiaochun Zhou Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China Division of Advanced Nanomaterials Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences (CAS) Suzhou 215123 China Division of Nanomaterials Suzhou Institute of Nano-Tech and Nano-Bionics Nanchang Chinese Academy of Sciences (CAS) Nanchang 330200 China Vacuum Interconnected Workstation Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences (CAS) Suzhou 215123 China

Flexible electrochemical power sources are attracting increasing attentions for their unique advantages like flexibility, shape diversity, light weight and excellent mechanical properties. In this research, we discover that the current collector can dramatically affect the performance of Flexible electrochemical power sources with large size. For Flexible air-breathing proton exchange membrane fuel cell (PEMFC), the performance could have more than 8 times increase by only adjusting the directions of current collectors. The different performances of different current collection types are mainly attributed to the diverse lengths of the electron transfer pathways. In addition, the conductivity of current collector can dramatically affect the capability of Flexible PEMFCs with large-size. The Flexible PEMFCs with thicker carbon nanotube membrane as current collector (low electric resistance) show higher ability. A mathematic model is successfully built in this work to further understand the performance. Moreover, the model and simulation are also applicable to other Flexible power sources, such as Flexible Li-ion battery and supercapacitor.

关键词： Flexible Fuel cell CNT membrane Current collector Li-ion battery Supercapacitor Large-size

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Facile preparation of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)/Ag2Te nanorod composite films for Flexible thermoelectric generator

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Journal of Materiomics 2021年第2期7卷 302-309页

作者： Qiufeng Meng Haijun Song Yong Du Yufei Ding Kefeng Cai Shanghai Key Laboratory of Development and Application for Metal-Functional Materials Key Laboratory of Advanced Civil Engineering MaterialsMinistry of EducationSchool of Materials Science&EngineeringTongji University4800 Caoan RoadShanghai201804China School of Materials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai201418China College of Mechanical and Electrical Engineering Jiaxing UniversityJiaxing314001China

In this work,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)coated silver telluride(PCeAg2Te)nanorods were prepared by a wet-chemical method using the PEDOT:PSS coated tellurium(PCeTe)nanorods as the templates.Flexible PCeAg2Te nanocomposite film on polyethersulfone(PES)substrate was prepared through vacuum filtration followed by mechanical pressing process.An optimal PCeAg2Te nanocomposite film showed a maximum power factor of 143.3 mW/mK^(2) at room temperature and 221.7 μW/mK^(2 ) at 373 K.The electrical conductivity of the PCeAg2Te composite film decreased by3.3%after bending for 1000 times around a rod with a radius of 5 mm.An eight-leg thermoelectric generator assembled with the optimal PCeAg2Te nanocomposite film generated a maximum output power and output density of 209.4 nW and 141.5 mW/cm^(2) at a temperature gradient of 30.3 K.This work provides a facile method to prepare thermoelectric materials for Flexible thermoelectric generators.

关键词： Thermoelectric Ag2Te Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) Flexible Generator

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Flexible memristors as electronic synapses for neuro- inspired computation based on scotch tape-exfoliated mica substrates

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Nano Research 2018年第3期11卷 1183-1192页

作者： Xiaobing Yan Zhenyu Zhou Jianhui Zhao Qi Liu Hong Wang Guoliang Yuan Jingsheng Chen College of Electron and Information Engineering Key Laboratory of Digital Medical Engineering of Hebei Province Key Laboratory of Optoelectronic Information Materials of Hebei Province Hebei University Baoding 071002 China Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Department of Materials Science and Engineering National University of Singapore Singapore 117576 Singapore

Flexible memristor devices based on plastic substrates have attracted considerable attention due to their applications in wearable computers and integrated circuits. However, most plastic-substrate memristors cannot function or be grown in high-temperature environments. In this study, scotch-tape-exfoliated mica was used as the Flexible memristor substrate in order to resolve these high-temperature issues. Our TiN/ZHO/IGZO memristor, which was constructed using a thin （10 μm） mica substrate, has superior flexibility and thermostability. After bending it 103 times, the device continues to exhibit exceptional electrical characteristics. It can also be implemented for transitions between high and low resistance states, even in temperatures of up to 300 ℃. More importantly, the biological synaptic characteristics of paired-pulse facilitation/depression （PPF/PPD） and spike- timing-dependent plasticity （STDP） were observed through applying different pulse measurement modes. This work demonstrates that Flexible memristor devices on mica substrates may potentially allow for the realization of high-temperature memristor applications for biologically-inspired computing systems.

关键词： mica Flexible memristor synapse

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Flexible and biocompatible nanopaper-based electrode arrays for neural activity recording

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Nano Research 2018年第10期11卷 5604-5614页

作者： Yichuan Guo Zhiqiang Fang Mingde Du Long Yang Leihou Shao Xiaorui Zhang Li Li Jidong Shi Jinsong Tao Jinfen Wang Hongbian Li Ying Fang CAS Key Laboratory for Biomedical Effects of Nanomatefials and Nanosafety CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 China Department of Neurobiology David Geffen School of Medicine University of California Los Angeles Los Angeles CA 90095 USA CAS Center for Excellence in Brain Science and Intelligence Technology 320 Yue Yang Road Shanghai 200031 China

Advances in neural electrode technologies can have a significant impact on both fundamental and applied neuroscience. Here, we report the development of Flexible and biocompatible neural electrode arrays based on a nanopaper substrate. Nanopaper has important advantages with respect to polymers such as hydrophilicity and water wettability, which result in significantly enhanced biocompatibility, as confirmed by both in vitro viability assays and in vivo histological analysis. In addition, nanopaper exhibits high flexibility and good shape stability. Hence, nanopaper-based neural electrode arrays can conform to the convoluted cortical surface of a rat brain and allow stable multisite recording of epileptiform activity in vivo. Our results show that nanopaper-based electrode arrays represent promising candidates for the Flexible and biocompatible recording of the neural activity.

关键词： nanopaper neural electrode biocompatibility Flexible epilepsy

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Flexible asymmetric supercapacitor with high energy density based on optimized MnO_2 cathode and Fe_2O_3 anode

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Chinese Chemical Letters 2019年第3期30卷 750-756页

作者： Weiwei Liu Menghua Zhu Jinghua Liu Xin Li Jian Liu Department of Chemistry and Chemical Engineering Harbin Institute of Technology State Key Lab of Urban Water Resource and Environment Harbin Institute of Technology College of Materials Science and Engineering Qingdao University of Science and Technology

All-so lid-state Flexible supercapacitors have shown great potential in wearable and portable electronics.In this work, a Flexible asymmetric pseudocapacitor(FAPC) is fabricated by using MnO_2 nanosheetscarbon fabric as cathode and Fe_2O_3 nanowire-carbon fabric as anode in the presence of PVA-LiCl as gel electrolyte. With high area capacitances of MnO_2 and Fe_2O_3 based electrodes by optimizing the reaction conditions, the device shows high working potential of 1.8 V, high area capacitance of 83.3 mF/cm^2(119 F/g), stable cycling performance with 82.3% of capacitance retention after 5000 cycles, and a competitive energy density of 53.55 Wh/kg in the broader context of MnO_2-based supercapacitors. In addition, the FAPC demonstrates excellent mechanical stability and flexibility with negligible degradation of electrochemical performance after numerous bending tests, establishing it as a promising candidate for portable and wearable energy storage.

关键词： Flexible Asymmetric supercapacitor MnO2 Fe2O3 All-solid-state Optimization

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An integrated Flexible and reusable graphene field effect transistor nanosensor for monitoring glucose

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Journal of Materiomics 2020年第2期6卷 308-314页

作者： Cong Huang Zhuang Hao Tianxu Qi Yunlu Pan Xuezeng Zhao Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin150001HeilongjiangChina School of Mechatronics Engineering Harbin Institute of TechnologyHarbin150001HeilongjiangChina School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin150001HeilongjiangChina

Diabetes is a chronic metabolic disease that has effect on blood sugar level and affects millions of people.We present an integrated Flexible and reusable graphene-based field effect transistor(GFET)nanosensor for the detection of glucose using pyrene-1-boronic acid(PBA)as the receptor.The nanosensor fabricated on the polyimide performs GFET-based rapid transduction of the glucose-PBA binding,thereby potentially allowing the detection of glucose that are sampled reliably from human bodily fluids(e.g.,sweat)in wearable sensing applications.Due to the reversible binding interaction between PBA and glucose,reusability of our nanosensor can be realized by exposing graphene surface to acidic solution.In characterizing the stability and reusability of the nanosensor for wearable applications,we investigated the effects of substrate bending,multiple reuse and long-time storage on the equilibrium dissociation constant between the PBA and glucose.Results show that bending,multiple reuse(over 10 times)and long-time storage has negligible effect on the sensing performance.The detection of glucose with a limit of detection(LOD)of 0.15 μM and a dynamic range of 0.05-100 μM,which covers the reference scope of physical examination or screening of diabetes.Hence,our Flexible GFET nanosensor is promising for wearable and reusable biosensing applications.

关键词： Graphene Flexible Reusable Glucose sensor Field-effect transistor

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Bugbee Flexible electrocautery facilitates choledochoscopic biopsy,fulguration,and debulking of a high grade intraductal papillary neoplasm of the bile duct

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Hepatobiliary & Pancreatic Diseases International 2018年第2期17卷 176-179页

作者： Ravi N Srinivasa Rajiv N Srinivasa Joseph J Gemmete Jeffrey Forris Beecham Chick Department of Radiology Division of Vascular and Interventional Radiology University of Michigan Health System 1500 East Medical Center Drive Ann Arbor MI 48109 USA

To the Editor:Intraductal papillary neoplasm of the bile duct(IPNB)may occur in the setting of primary sclerosing cholangitis,choledochal cysts or hepatolithiasis[1].The entity may be a precursor of cancer or intrahepatic cholangiocarcinoma.Invasive carcinoma,tubular or mucinous adenocarcinoma is present in approximately 40%-80%of IPNBs[1–3].IPNB is frequently found in the resection margins of patients undergoing hepatectomy for cholangiocarcinoma[4].

关键词： fulguration and debulking of a high grade intraductal papillary neoplasm of the bile duct Bugbee Flexible electrocautery facilitates choledochoscopic biopsy Flexible

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Recent Progress of MXene-Based Nanomaterials in Flexible Energy Storage and Electronic Devices

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Energy & Environmental Materials 2018年第4期1卷 183-195页

作者： Qi Yang Yukun Wang Xinliang Li Hongfei Li Zifeng Wang Zijie Tang Longtao Ma Funian Mo Chunyi Zhi Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueHong KongChina Chengdu Research Institute City University of Hong KongChengdu 610000China

The increasing demands for wearable electronics have stimulated the rapid development of Flexible energy storage devices.MXenes are considered as promising Flexible electrodes due to the ultrahigh volumetric specific ... 详细信息

关键词： batteries electronics Flexible MXenes supercapacitors

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Low-cost and low-density carbonized facial tissue supported uniform NiCo_(2)S_(4)nanotubes for high capacity Flexible solid-state supercapacitors

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Journal of Materiomics 2021年第1期7卷 166-176页

作者： Haiwei Wu Jingxuan Bi Yiyi Li Li Wang Xiaofei Pang Chuanyin Xiong Zhijian Li Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development College of Bioresources Chemical and Materials EngineeringShaanxi University of Science&TechnologyXi'an710021China National Demonstration Center for Experimental Light Chemistry Engineering Education Shaanxi University of Science&TechnologyXi'an710021China

Recently,rapid development of intelligent wearable electronic equipment has triggered great needs for Flexible and lightweight portable energy storage systems.Here,we demonstrate a low-cost($0.5 m^(-2))and low density carbonized facial tissue paper(FCP)for high-conductive NiCo_(2)S_(4)nanotubes assisted novel ultra-Flexible solid-state supercapacitors(SSCs).The hydrothermal synthesized FCP-900@NiCo_(2)S_(4)electrodes in this paper only have a density of 5 mg cm^(-2)and show large specific capacitance of 3115 mF cm^(-2)at 2 mA cm^(-2).Based on the high performance of FCP-900@NiCo_(2)S_(4)electrodes,the as assembled SSCs can deliver an energy density of 1.2 mWh cm^(-3),high power density of 58.16 mW cm-3.It also shows great bending-state capacitive performance with high capacitance retention after 5000 cycles,providing a new opportunity for developing high-performance Flexible wearable energy storage devices.

关键词： NiCo_(2)S_(4) Facial tissue Carbon paper Flexible Solid-state supercapacitors

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Synthesis, Structure and Slow Magnetization Relaxation of Co(Ⅱ) Complexes from a Flexible Imidazole-based Ligand

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Chinese Journal of Structural Chemistry 2019年第1期38卷 137-146,5页

作者：雍娟黄薇吴大雨 School of Petrochemical Engineering Changzhou University

The employment of a Flexible imidazole-based ligand(H_2L), condensed from 1 Himidazole-2-carbaldehyde and 1,2-bis(aminooxy)ethane, and Co^(2+) salt has led to the formation of Co(Ⅱ) complexes [Co(H_2L)_2Cl]Cl·4CH_3OH(1) and [Co(H_2L)(NCS)_2]_2·2C_4H_(10)O(2), in the presence of different anions, i.e, Cl-and SCN-, respectively. Single-crystal X-ray analyses show that complex 1 with a square pyramid(C_(4v)) local environment exhibits a two-dimensional(2D)layered(4,4)-net framework and complex 2 displays a dinuclear molecule box with a T_d local environment. By comparison between complexes 1 and 2, the versatile configuration of ligand including cis-and trans-form isomer has a significant effect on the structures of the resulting complexes. The magnetic properties of 1 and 2 are also investigated. The ac magnetic susceptibility revealed that 2 exhibits the characteristic of slow magnetization relaxation.

关键词： crystal engineering Flexible ligand cobalt slow magnetization relaxation

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