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首页> 外文期刊>Journal of Energy Storage >Silver incorporated partially reduced NiCo-layered double hydroxide frameworks for asymmetric supercapacitors
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Silver incorporated partially reduced NiCo-layered double hydroxide frameworks for asymmetric supercapacitors

机译：银掺入不对称超级电容器的部分减少的Nico层双氢氧化物框架

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摘要

Asymmetric supercapacitors have emerged as one of the most appropriate energy storage systems. Enhancing the specific capacity of electrode materials at high current densities is a critical issue in asymmetric capacitors. Herein, we optimized a simple strategy to develop partial reduced hierarchical nanosheets shaped nickel-cobalt layered double hydroxide with Ag nanoparticles for efficient charge storage. The composite cathodes are pre-pared using a mild hydrothermal method followed by a liquid phase reduction process. Benefiting from the electric conductivity tuning, the hybrids reveal better capacitive performances. Among all, the nickel-cobalt layered double hydroxide with 5 wt.% Ag decoration presents a high specific capacitance of 1338 F g(-1) at a current density of 10 A g(-1) with a good capacity retention of 660 F g(-1) at 60 A g(-1), implying its fascinating rate capability. Besides, the established capacitor device achieves an energy density of 43.07 Wh kg(-1) at a power density of 400 W kg(-1). Interestingly, the device exhibits excellent long-term durability for 10,000 consecutive cycles of repeated charge-discharge processes at 12.5 A g(-1) with a capacity retention of 89.6%. Such a high performance suggests a practical and feasible approach as three-dimensional (3D) electrode tailoring for sustainable energy storage devices.
机译：非对称超级电容器已成为最合适的能量存储系统之一。在高电流密度下提高电极材料的比容量是在不对称电容器中的关键问题。在此，我们优化了一种简单的策略，以通过Ag纳米颗粒开发部分减少的分层纳米片形状的镍 - 钴层双氢氧化物，用于有效电荷储存。使用温和的水热方法预先削减复合阴极，然后进行液相减少过程。受益于电导率调谐，混合动力车揭示了更好的电容性能。其中，具有5wt.％Ag装饰的镍 - 钴层叠双氢氧化物，其电流密度为10 a g（-1）的高比电容，良好的容量保持660 f g（-1）在60 a g（-1）时，暗示其令人乐趣的速率能力。此外，所建立的电容器装置以400W kg（-1）的功率密度实现43.07WH kg（-1）的能量密度。有趣的是，该器件具有优异的长期耐久性，可在12.5A（-1）下的10,000个连续的重复充放电过程循环，其容量保留为89.6％。这种高性能表明了一种用于可持续能量存储装置的三维（3D）电极的实际和可行的方法。

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  • 来源
    《Journal of Energy Storage》 |2020年第10期|101578.1-101578.9|共9页
  • 作者

    Li Xiaoyu; Khalafallah Diab; Wu Zongxiao; Zhi Mingjia; Hong Zhanglian;

  • 作者单位

    Zhejiang Univ Sch Mat Sci & Engn State Key Lab Silicon Mat 38 Zheda Rd Hangzhou 310027 Peoples R China;

    Zhejiang Univ Sch Mat Sci & Engn State Key Lab Silicon Mat 38 Zheda Rd Hangzhou 310027 Peoples R China|Aswan Univ Fac Energy Engn Mech Design & Mat Dept Aswan 81521 Egypt;

    Zhejiang Univ Sch Mat Sci & Engn State Key Lab Silicon Mat 38 Zheda Rd Hangzhou 310027 Peoples R China;

    Zhejiang Univ Sch Mat Sci & Engn State Key Lab Silicon Mat 38 Zheda Rd Hangzhou 310027 Peoples R China;

    Zhejiang Univ Sch Mat Sci & Engn State Key Lab Silicon Mat 38 Zheda Rd Hangzhou 310027 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Layered double hydroxide; Hierarchical frameworks; Partial reduction; Asymmetric capacitor;

    机译：分层双氢氧化物;分层框架;部分减少;不对称电容器;

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