Achieving Ultrahigh Energy Densities of Supercapacitors with Porous Titanium Carbide/Boron‐Doped Diamond Composite Electrodes
Achieving Ultrahigh Energy Densities of Supercapacitors with Porous Titanium Carbide/Boron‐Doped Diamond Composite Electrodes
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DOI：
10.1002/aenm.201803623
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发表时间：
2019-03
影响因子：
27.8
通讯作者：
Jing Xu;N. Yang;S. Heuser;Siyu Yu;Anna Schulte;H. Schönherr;Xin Jiang
中科院分区：
文献类型：
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作者：
Jing Xu;N. Yang;S. Heuser;Siyu Yu;Anna Schulte;H. Schönherr;Xin Jiang
大多数超级电容器（SC）的能量密度较低，阻碍了它们的实际应用。为了构建具有高能量密度的SC，在使用等离子体电解氧化（PEO）技术预处理的钛板上合成多孔碳化钛（TiC）/掺硼金刚石（BDD）复合电极。在PEO工艺期间形成的多孔和纳米厚的TiO 2层防止了脆性氢化钛的形成，并增强了化学气相沉积工艺期间的BDD生长。同时，实现了TiO 2向TiC的原位转化。这种电容器电极与可溶性氧化还原电解质的组合导致在水溶液和有机溶液中制造高性能SC。在0.05 m Fe（CN）63−/4− + 1 m Na 2SO 4水溶液中，在1 mA cm− 2电流密度下，电容高达46.3 mF cm− 2;即使经过10000次充放电循环，该电容仍保持其初始值的92%;在2236 W kg−1功率密度下，能量密度高达47.4 Wh kg− 1。所构建的SC的性能上级大多数可用的SC和一些电化学能量存储装置如电池。因此，这种多孔电容器电极有希望用于构建用于实际应用的高性能SC。
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)63−/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.