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Maximizing the ion accessibility and high mechanical strength in nanoscale ion channel MXene electrodes for high-capacity zinc-ion energy storage

引用

Science Bulletin 2022年第21期67卷 2216-2224页

作者： Yongfa Cheng Yimei Xie Shuwen Yan Zunyu Liu Yanan Ma Yang Yue Jianbo Wang Yihua Gao Luying Li Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Physics and Technology Center for Electron MicroscopyKey Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education and the Institute for Advanced StudiesWuhan UniversityWuhan 430072China

Two-dimensional transition-metal carbides(MXenes)have superhydrophilic surfaces and superior metal conductivity,making them competitive in the field of electrochemical energy ***,MXenes with layered structures are easily stackable,which reduces the ion accessibility and transport paths,thus limiting their electrochemical *** fully exploit the advantages of MXenes in electrochemical energy storage,this study reports the etching of large-sized MXene into nanosheets with nanoscale ion channels via a chemical oxidation *** the resulting ion-channel MXene electrodes retain the excellent mechanical strength and electrical conductivity of large-sized MXene nanosheets,they can effectively shorten the ion transport distance and improve the overall electrochemical *** fabricated self-healing MXene-based zinc-ion microcapacitor exhibits a high areal specific capacitance(532.8 mF cm^(-2))at the current density of 2mA cm^(-2),a low self-discharge rate(4.4 mV h^(-1)),and high energy density of 145.1μWh cm^(-2)at the power density of 2800μW cm^(-2).The proposed nanoscale ion channel structure provides an alternative strategy for constructing high-performance electrochemical energy storage electrodes,and has great application prospects in the fields of electrochemical energy storage and flexible electronics.

关键词： MXene ion channel ion accessibility High strength zinc-ion microcapacitor

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