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MnO_x/Ni(OH)_2 Nanocomposite Materials for High-Performance Electrochemical capacitor Application

机译：MnO_x / Ni（OH）_2纳米复合材料在高性能电化学电容器中的应用

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摘要

Nanostructured MnO_x/Ni(OH)_2 composites have been electrodeposited on Ni foam for synthesis of a binder-free electrode for electrochemical capacitors with high specific capacitance and stable electrochemical properties. The microstructure, morphology and chemical composition were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Cyclic voltammetry and galvanostatic charge/discharge measurements were applied to investigate the electrochemical capacitance of the electrode active materials. The results indicated that MnO_x acted as a template for growth of Ni(OH)_2 with an inter-connected 3D porous network nanostructure. A maximum capacitance value of 2334 F/g at current density of 5 A/g in 1 M KOH electrolyte was achieved, much higher than that of pure Ni(OH)_2 and MnO_x (992 and 179 F/g, respectively). Moreover, in the charge/discharge process at even larger current density of 20 A/g, the electrode could maintain 82.8 % of the initial specific capacitance after 500 cycles, higher than that of pure Ni(OH)_2 (only 46.6% remains). The enhanced capacitance performance was attributed to the synergic effect between the respective single oxides.
机译：纳米结构的MnO_x / Ni（OH）_2复合材料已被电沉积在Ni泡沫塑料上，用于合成无粘合剂电极，用于具有高比电容和稳定电化学性能的电化学电容器。通过X射线衍射，扫描电子显微镜和X射线光电子能谱表征其微观结构，形貌和化学组成。循环伏安法和恒电流充电/放电测量用于研究电极活性材料的电化学电容。结果表明，MnO_x充当具有相互连接的3D多孔网络纳米结构的Ni（OH）_2生长的模板。在1 M KOH电解质中，电流密度为5 A / g时，最大电容值为2334 F / g，远高于纯Ni（OH）_2和MnO_x（分别为992和179 F / g）。此外，在更大的电流密度20 A / g的充电/放电过程中，电极在500次循环后可保持初始比电容的82.8％，高于纯Ni（OH）_2（仅剩46.6％）。 。增强的电容性能归因于各个单一氧化物之间的协同作用。

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  • 来源
    《Journal of nano research》 |2012年第2012期|53-60|共8页
  • 作者

    Zan Wang; Xin Wang; Yun-Xiao Zhao; Cui-Mei Zhao; Wei-Tao Zheng;

  • 作者单位

    The first hospital of Jilin University, Changchun, 130021, P.R. China;

    Department of Materials Science, Key Laboratory of Mobile Materials, MOE, Jilin University Changchun 130012, P.R. China;

    Department of Materials Science, Key Laboratory of Mobile Materials, MOE, Jilin University Changchun 130012, P.R. China;

    Department of Materials Science, Key Laboratory of Mobile Materials, MOE, Jilin University Changchun 130012, P.R. China;

    Department of Materials Science, Key Laboratory of Mobile Materials, MOE, Jilin University Changchun 130012, P.R. China;

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  • 正文语种 eng
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  • 关键词

    electrochemical capacitor; oxides composite electrode; electrodeposition;

    机译：电化学电容器氧化物复合电极电沉积;

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