Nature-Inspired Interconnected Macro/Meso/Micro-Porous MXene Electrode |
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Authors: | Mengjie Wang Yongfa Cheng Hongyun Zhang Feng Cheng Yongxin Wang Tao Huang Zhichao Wei Yuhang Zhang Binghui Ge Yanan Ma Yang Yue Yihua Gao |
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Affiliation: | 1. Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601 China;2. Center for Nanoscale Characterization & Devices (CNCD), Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics, Huazhong University of Science and Technology (HUST), LuoyuRoad 1037, Wuhan, 430074 China;3. Hubei key laboratory of energy storage and power battery, School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan, 442002 China |
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Abstract: | The geometric multiplication development of MXene has promoted it to become a star material in numerous applications including, but not limited to, energy storage. It is found that pore structure modulation engineering can improve the inherent properties of MXene, in turn significantly enhancing its electrochemical performance. However, most of the current works have focused on exploring the structure-effective relationships of the single-scale pore structure regulation of MXene. Inspired by Murray's law from nature where a highly graded structure of the organisms is discovered and used to achieve effective diffusion and maximize mass transfer, a hierarchically interconnected porous MXene electrode across micro-meso-macroporous is constructed. This MXene-based electrode provides large amounts of active sites while greatly shortening the ion diffusion channel. Finally, the zinc ion microcapacitor based on this MXene electrode exhibits an ultrahigh area-specific capacitance up to 410 mF cm−2 and an energy density up to 103 µWh cm−2 at a power density of 2100 µW cm−2. The areal energy density outperforms the currently reported zinc ion microcapacitors. This study supports an effective strategy for electrode materials (including but not limited to MXene) to achieve ultra-short ion diffusion channels and maximum transport efficiency for next-generation high-performance energy storage. |
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Keywords: | high energy densities macro/meso/micro-porous electrodes Murray's law MXenes zinc-ion microcapacitors |
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