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首页> 外文期刊>Energy & environmental science >Carbon-coated WS_2 nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors
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Carbon-coated WS_2 nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors

机译：用于高速钾离子电容器的碳纳米纤维上的碳涂层WS_2纳米蛋白酶

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摘要

Potassium-ion capacitors (PICs) have received increasing attention because of their high energy/power densities and the abundance of potassium. However, achieving high-rate battery-type anodes to match the capacitor-type cathodes is still a great challenge. Herein, we design a freestanding anode by supporting carbon-coated WS2 nanosheets on carbon nanofibers (C-WS2@CNFs) for PICs. Benefiting from its unique nanostructure and the high purity of WS2, the C-WS2@CNFs anode exhibits a high reversible capacity of 319 mA h g(-1) at 50 mA g(-1) and a high rate performance of 168 mA h g(-1) at 10 A g(-1). An intercalation-conversion reaction mechanism with an intermediate phase of K2S5 is verified by in situ Raman, in situ XRD, and ex situ XRD and TEM. First-principles calculations confirm that the C-WS2@CNFs anode possesses fast K+ diffusion kinetics and a high K-adsorption ability. The potassium ion capacitor, assembled from the anode of C-WS2@CNFs and the cathode of activated carbon nanofibers, delivers a superior energy density up to 180.4 W h kg(-1), a good rate capability, and a long cycle life.
机译：由于它们的高能量/功率密度和丰度，钾离子电容器（PICS）受到越来越长的关注。然而，实现高速电池型阳极匹配电容器型阴极仍然是一个很大的挑战。在此，我们通过支持在碳纳米纤维（C-WS2 @ CNF）上的碳涂覆的WS2纳米片来设计独立的阳极。从其独特的纳米结构和高纯度的WS2中受益，C-WS2 @ CNFS阳极在50mA G（-1）的高度可逆容量为319 mA Hg（-1），高速性能为168 mA hg（ -1）10 a g（-1）。通过原位拉曼，原位XRD和EX原位XRD和TEM通过K2S5的中间阶段的嵌入转化反应机制验证。第一原理计算证实C-WS2 @ CNFS阳极具有快速的K +扩散动力学和高k吸附能力。从C-WS2 @ CNFS和活性炭纳米纤维的阴极组装的钾离子电容器，可高达180.4WH kg（-1），良好的速率能力和长循环寿命的优异能量密度。

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  • 来源
    《Energy & environmental science》 |2021年第5期|3184-3193|共10页
  • 作者

    Geng Shitao; Zhou Tong; Jia Minyu; Shen Xiangyan; Gao Peibo; Tian Shuang; Zhou Pengfei; Liu Bo; Zhou Jin; Zhuo Shuping; Li Feng;

  • 作者单位

    Shandong Univ Technol Sch Phys & Optoelect Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Phys & Optoelect Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Phys & Optoelect Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Chem & Chem Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Phys & Optoelect Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Phys & Optoelect Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Chem & Chem Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Phys & Optoelect Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Chem & Chem Engn Zibo 255049 Peoples R China;

    Shandong Univ Technol Sch Chem & Chem Engn Zibo 255049 Peoples R China;

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

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