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首页> 外文期刊>Advanced energy materials >Achieving Ultrahigh Energy Densities of Supercapacitors with Porous Titanium Carbide/Boron-Doped Diamond Composite Electrodes
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Achieving Ultrahigh Energy Densities of Supercapacitors with Porous Titanium Carbide/Boron-Doped Diamond Composite Electrodes

机译：多孔碳化钛/掺硼金刚石复合电极实现超级电容器的超高能量密度

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摘要

The energy densities of most supercapacitors (SCs) are low, hindering their practical applications. To construct SCs with ultrahigh energy densities, a porous titanium carbide (TiC)/boron-doped diamond (BDD) composite electrode is synthesized on a titanium plate that is pretreated using a plasma electrolytic oxidation (PEO) technique. The porous and nanometer-thick TiO2 layer formed during PEO process prevents the formation of brittle titanium hydride and enhances the BDD growth during chemical vapor deposition processes. Meanwhile, the in situ conversion of TiO2 into TiC is achieved. Combination of this capacitor electrode with soluble redox electrolytes leads to the fabrication of high-performance SCs in both aqueous and organic solutions. In 0.05 m Fe(CN)(6)(3-/4-) + 1 m Na2SO4 aqueous solution, the capacitance is as high as 46.3 mF cm(-2) at a current density of 1 mA cm(-2); this capacitance remains 92% of its initial value even after 10 000 charge/discharge cycles; the energy density is up to 47.4 Wh kg(-1) at a power density of 2236 W kg(-1). The performance of constructed SCs is superior to most available SCs and some electrochemical energy storage devices like batteries. Such a porous capacitor electrode is thus promising for the construction of high-performance SCs for practical applications.
机译：大多数超级电容器（SC）的能量密度很低，从而阻碍了它们的实际应用。为了构建具有超高能量密度的SC，在钛板上合成了多孔碳化钛（TiC）/掺硼金刚石（BDD）复合电极，并使用等离子电解氧化（PEO）技术对其进行了预处理。在PEO过程中形成的多孔且纳米级的TiO2层可防止脆性氢化钛的形成，并增强化学气相沉积过程中BDD的生长。同时，实现了TiO2原位转化为TiC。这种电容器电极与可溶性氧化还原电解质的结合导致在水溶液和有机溶液中都可以制造高性能SC。在0.05 m Fe（CN）（6）（3- / 4-）+ 1 m Na2SO4水溶液中，在1 mA cm（-2）的电流密度下，电容高达46.3 mF cm（-2）。即使经过1万次充电/放电循环，该电容仍保持其初始值的92％；在2236 W kg（-1）的功率密度下，能量密度高达47.4 Wh kg（-1）。构造的SC的性能优于大多数可用的SC和某些电化学能量存储设备（如电池）。因此，这种多孔电容器电极有望用于实际应用中的高性能SC的构造。

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  • 来源
    《Advanced energy materials》 |2019年第17期|1803623.1-1803623.11|共11页
  • 作者

    Xu Jing; Yang Nianjun; Heuser Steffen; Yu Siyu; Schulte Anna; Schoenherr Holger; Jiang Xin;

  • 作者单位

    Univ Siegen, Inst Mat Engn, D-57076 Siegen, Germany;

    Univ Siegen, Inst Mat Engn, D-57076 Siegen, Germany;

    Univ Siegen, Inst Mat Engn, D-57076 Siegen, Germany;

    Univ Siegen, Inst Mat Engn, D-57076 Siegen, Germany;

    Univ Siegen, Dept Chem & Biol, Phys Chem 1, D-57076 Siegen, Germany|Univ Siegen, Dept Chem & Biol, Res Ctr Micro & Nanochem & Engn C, D-57076 Siegen, Germany;

    Univ Siegen, Dept Chem & Biol, Phys Chem 1, D-57076 Siegen, Germany|Univ Siegen, Dept Chem & Biol, Res Ctr Micro & Nanochem & Engn C, D-57076 Siegen, Germany;

    Univ Siegen, Inst Mat Engn, D-57076 Siegen, Germany;

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  • 正文语种 eng
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  • 关键词

    boron-doped diamond; composite films; energy densities; high-performance supercapacitors; TiC;

    机译：掺硼金刚石;复合膜;能量密度;高性能超级电容器;TiC;

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