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首页> 外文期刊>Chemistry: A European journal >In Situ Growth of Hierarchical Ni-Mn-O Solid Solution on a Flexible and Porous Ni Electrode for High-Performance All-Solid-State Asymmetric Supercapacitors
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In Situ Growth of Hierarchical Ni-Mn-O Solid Solution on a Flexible and Porous Ni Electrode for High-Performance All-Solid-State Asymmetric Supercapacitors

机译：在柔性镍氢电极上的等级Ni-Mn-O固溶体的原位生长，用于高性能全固态不对称超微电容器

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摘要

To endow all-solid-state asymmetric supercapacitors with high energy density, cycling stability, and flexibility, we design a binder-free supercapacitor electrode by in situ growth of well-distributed broccoli-like Ni_(0.75)Mn_(0.25)O/C solid solution arrays on a flexible and three-dimensional Ni current collector (3D-Ni). The electrode consists of a bottom layer of compressed but still porous Ni foam with excellent flexibility and high electrical conductivity, an intermediate layer of interconnected Ni nanoparticles providing a large specific surface area for loading of active substances, and a top layer of vertically aligned mesoporous nanosheets of a Ni_(0.75)Mn_(0.25)O/C solid solution. The resultant 3D-Ni/ Ni_(0.75)Mn_(0.25)O/C cathode exhibits a specific capacitance of 1657.6 mFcm~(-2) at 1 mAcm~(-2) and shows no degradation of the capacitance after 10000 cycles at 3 mAcm~(-2). The assembled 3D-Ni/Ni_(0.75)Mn_(0.25)O/C//activated carbon asymmetric supercapacitor has a high specific capacitance of 797.7 mFcm~(-2) at 2 mAcm~(-2) and an excellent cycling stability with 85.3% of capacitance retention after 10000 cycles at a current density of 3 mAcm~(-2). The energy density and power density of the asymmetric supercapacitor are up to 6.6 mWhcm~(-3) and 40.8 mWcm~(-3), respectively, indicating a fairly promising future of the flexible 3D-Ni/Ni_(0.75)Mn_(0.25)O/C electrode for efficient energy storage applications.
机译：为了赋予高能量密度，循环稳定性和柔韧性的全固态不对称超级电容器，通过原位生长设计一种无粘合剂的超级电容器，均匀分布的西兰花（0.75）MN_（0.25）O / C.柔性和三维NI集电体（3D-NI）上的固体溶液阵列。电极由压缩但仍然多孔Ni泡沫的底层组成，具有优异的柔韧性和高电导率，相互连接的Ni纳米颗粒的中间层，提供了用于加载活性物质的大的比表面积，以及垂直对齐的中孔纳米片的顶层Ni_（0.75）Mn_（0.25）O / C固溶体。得到的3D-Ni / Ni_（0.75）Mn_（0.25）O / C阴极在1mmm〜（-2）下表现出1657.6mfcm〜（-2）的特定电容，并且在3时显示在10000周期后电容的劣化Macm〜（-2）。组装的3D-Ni / Ni_（0.75）MN_（0.25）O / C //活化的碳非对称超级电容器在2mmm〜（-2）的高比电容为797.7mfcm〜（-2），以及出色的循环稳定性85.3％的电容保留后10000次循环，电流密度为3 macm〜（-2）。不对称超级电容器的能量密度和功率密度可分别为6.6 MWWM〜（-3）和40.8 mWcm〜（-3），表明柔性3D-Ni / Ni_（0.75）MN_的相当有希望的未来（0.25 ）O / C电极用于高效的能量存储应用。

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  • 来源
    《Chemistry: A European journal》 |2019年第66期|共10页
  • 作者

    Huan Yu; Xiaofeng Li; Jing Yang; Zhiming Deng; Zhong-Zhen Yu;

  • 作者单位

    State Key Laboratory of Organic-Inorganic Composites College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 (China);

    State Key Laboratory of Organic-Inorganic Composites College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 (China);

    School of Materials Science &

    Engineering Sun Yat-Sen University 135 Xingang West Road Guangzhou 510275 (China);

    Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical Technology Beijing 100029 (China);

    State Key Laboratory of Organic-Inorganic Composites College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 (China);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    cycling stabilities; freestanding electrodes; nickel; solid solutions; supercapacitors;

    机译：循环稳定性;独立电极;镍;固体解决方案;超级电容器;

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