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首页> 外文期刊>Advanced energy materials >Multidimensional Ordered Bifunctional Air Electrode Enables Flash Reactants Shuttling for High-Energy Flexible Zn-Air Batteries
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Multidimensional Ordered Bifunctional Air Electrode Enables Flash Reactants Shuttling for High-Energy Flexible Zn-Air Batteries

机译：多维有序双功能空气电极使闪速反应器能够为高能柔性Zn-空气电池供电

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摘要

Direct growth of electrocatalysts on conductive substrates is an emerging strategy to prepare air electrodes for flexible Zn-air batteries (FZABs). However, electrocatalysts grown on conductive substrates usually suffer from disorder and are densely packed with "prohibited zones", in which internal blockages shut off the active sites from catalyzing the oxygen reaction. Herein, to minimize the "prohibited zones", an ordered multidimensional array assembled by 1D carbon nanotubes and 2D carbon nanoridges decorated with 0D cobalt nanoparticles (referred as MPZ-CC@CNT) is constructed on nickel foam. When the MPZ-CC@CNT is directly applied as a self-supported electrode for FZAB, it delivers a marginal voltage fading rate of 0.006 mV cycle(-1) over 1800 cycles (600 h) at a current density of 50 mA cm(-2) and an impressive energy density of 946 Wh kg(-1). Electrochemical impedance spectroscopy reveals that minimal internal resistance and electrochemical polarization, which is beneficial for the flash reactant shuttling among the triphase (i.e., oxygen, electrolyte, and catalyst) are offered by the open and ordered architecture. This advanced electrode design provides great potential to boost the electrochemical performance of other rechargeable battery systems.
机译：电催化剂在导电基底上的直接生长是制备用于柔性Zn-空气电池（FZAB）的空气电极的新兴策略。然而，在导电基底上生长的电催化剂通常会遭受紊乱并且密集地堆积有“禁区”，在禁区中，内部堵塞使活性位点不能催化氧反应。在本文中，为了最小化“禁区”，在镍泡沫上构造由一维碳纳米管和装饰有0D钴纳米颗粒（称为MPZ-CC @ CNT）的二维碳纳米脊组装而成的有序多维阵列。当将MPZ-CC @ CNT直接用作FZAB的自支撑电极时，它在1800个周期（600 h）内以50 mA cm（的电流密度）提供0.006 mV周期（-1）的边际电压衰减率。 -2）和946 Wh kg（-1）的惊人能量密度。电化学阻抗谱显示，开放的和有序的体系结构提供了最小的内部电阻和电化学极化，这有利于三相反应物（即氧气，电解质和催化剂）之间的闪动反应物穿梭。这种先进的电极设计具有巨大的潜力，可以提高其他可充电电池系统的电化学性能。

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  • 来源
    《Advanced energy materials》 |2019年第24期|1900911.1-1900911.9|共9页
  • 作者

    Jiang Yi; Deng Ya-Ping; Liang Ruilin; Fu Jing; Luo Dan; Liu Guihua; Li Jingde; Zhang Zhen; Hu Yongfeng; Chen Zhongwei;

  • 作者单位

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Saskatchewan, Canadian Light Source, Saskatoon, SK S7N 0X4, Canada;

    Univ Waterloo, Waterloo Inst Sustainable Energy, Waterloo Inst Nanotechnol, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada;

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  • 正文语种 eng
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  • 关键词

    flash reactants shuttling; multidimensional ordered architecture; self-supported electrodes; Zn-air batteries;

    机译：闪光反应物穿梭;多维有序架构;自支撑电极;Zn-Air电池;

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