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首页> 外文期刊>Advanced energy materials >Fast Redox Kinetics in Bi-Heteroatom Doped 3D Porous Carbon Nanosheets for High-Performance Hybrid Potassium-Ion Battery Capacitors
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Fast Redox Kinetics in Bi-Heteroatom Doped 3D Porous Carbon Nanosheets for High-Performance Hybrid Potassium-Ion Battery Capacitors

机译：高性能混合钾离子电池电容器的双杂原子掺杂3D多孔碳纳米片中的快速氧化还原动力学。

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摘要

Potassium-ion hybrid capacitors (PIHCs) hold the advantages of high-energy density of batteries and high-power output of supercapacitors and thus present great promise for the next generation of electrochemical energy storage devices. One of the most crucial tasks for developing a high-performance PIHCs is to explore a favorable anode material with capability to balance the kinetics mismatch between battery-type anodes and capacitor-type cathode. Herein, a reliable route for fabricating sulfur and nitrogen codoped 3D porous carbon nanosheets (S-N-PCNs) is reported. Systematic characterizations coupled with kinetics analysis indicate that the doped heteroatoms of sulfur and nitrogen and the amplified graphite interlayer can provide ample structural defects and redox active sites that are beneficial for improving pseudocapacitive activity, enabling fast kinetics toward efficient potassium-ion storage. The S-N-PCNs are demonstrated to exhibit superior potassium storage capability with a high capacity of 107 mAh g(-1) at 20 A g(-1) and long cycle stability. The as-developed PIHCs present impressive electrochemical performance with an operating voltage as high as 4.0 V, an energy density of 187 Wh kg(-1), a power density of 5136 W kg(-1), and a capacity retention of 86.4% after 3000 cycles.
机译：钾离子混合电容器（PIHC）具有电池高能量密度和超级电容器高功率输出的优点，因此对下一代电化学储能装置具有广阔的前景。开发高性能PIHC的最关键的任务之一是探索一种能够平衡电池型阳极与电容器型阴极之间动力学失配的良好阳极材料。在此，报道了一种用于制造硫和氮共掺杂的3D多孔碳纳米片（S-N-PCNs）的可靠途径。系统表征和动力学分析表明，硫和氮的掺杂杂原子和放大的石墨中间层可提供充足的结构缺陷和氧化还原活性位点，有利于改善拟电容活性，从而实现快速动力学以实现有效的钾离子存储。 S-N-PCNs具有优异的钾存储能力，在20 A g（-1）时具有107 mAh g（-1）的高容量，并具有长周期稳定性。先进的PIHC具有出色的电化学性能，工作电压高达4.0 V，能量密度为187 Wh kg（-1），功率密度为5136 W kg（-1），容量保持率为86.4％ 3000个周期后。

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  • 来源
    《Advanced energy materials》 |2019年第42期|1901533.1-1901533.10|共10页
  • 作者

    Hu Xiang; Liu Yangjie; Chen Junxiang; Yi Luocai; Zhan Hongbing; Wen Zhenhai;

  • 作者单位

    Chinese Acad Sci Fujian Inst Res Struct Matter CAS Key Lab Design & Assembly Funct Nanostruct Fuzhou 350002 Fujian Peoples R China|Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Prov Key Lab Nanomat Fuzhou 350002 Fujian Peoples R China|Fuzhou Univ Coll Mat Sci & Engn Fuzhou 350108 Fujian Peoples R China;

    Chinese Acad Sci Fujian Inst Res Struct Matter CAS Key Lab Design & Assembly Funct Nanostruct Fuzhou 350002 Fujian Peoples R China|Chinese Acad Sci Fujian Inst Res Struct Matter Fujian Prov Key Lab Nanomat Fuzhou 350002 Fujian Peoples R China;

    Fuzhou Univ Coll Mat Sci & Engn Fuzhou 350108 Fujian Peoples R China;

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

    fast kinetics; porous carbon nanosheets; potassium-ion hybrid capacitors; sulfur and nitrogen codoped;

    机译：快速动力学多孔碳纳米片;钾离子混合电容器;硫和氮共掺杂;

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