Effects of substrates on the capacitive performance of RuOx•nH2O and activated carbon-RuOx electrodes for supercapacitors
Effects of substrates on the capacitive performance of RuOx•nH2O and activated carbon-RuOx electrodes for supercapacitors
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DOI：
10.1016/j.electacta.2004.03.017
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发表时间：
2004-09-01
影响因子：
6.6
通讯作者：
Chen, WC
中科院分区：
文献类型：
--
作者：
Hu, CC;Chen, WC
由水合氧化钌（RuOx.nH（2）O）或活性炭-水合氧化钌（AC-RuOx）复合材料组成的电极上的电化学能量储存和传递被发现强烈地依赖于所采用的基底。活性材料-石墨界面处的接触电阻远低于活性材料-不锈钢（SS）网界面处的接触电阻。发现沉积在SS网格（RuOx/Au/SS）上的金+RuOx·nH（2）O薄膜极大地改善了SS网格与电极材料之间的不良接触。由10 wt.%的AC-RuOx/RuOx/Au/SS电极获得的RuOx·nH（2）O的最大比电容（C-S·RuOx）为1580 F g（-1）（在1 mV s（-1）下测量），非常接近理论值。溶胶-凝胶法制备RuOx·nH（2）O在空气中200 ℃退火2 h。这种AC-RuOx/RuOx/Au/SS电极的高电化学可逆性、高功率特性、良好的稳定性和改善的频率响应表明其在超级电容器中具有良好的应用潜力。高分辨透射电子显微镜（HRTEM）观察到RuOx·nH（2）O纳米粒子的粒径分布均匀，在1.5 ~ 3 nm之间，这可能是RuOx·nH（2）O纳米粒子比电容的主要原因。(C)2004 Elsevier Ltd.保留所有权利。
The electrochemical energy storage and delivery on the electrodes composed of hydrous ruthenium oxide (RuOx.nH(2)O) or activated carbon-hydrous ruthenium oxide (AC-RuOx) composites are found to strongly depend on the substrate employed. The contact resistance at the active material-graphite interface is much lower than that at the active material-stainless steel (SS) mesh interface. Thin films of gold plus RuOx.nH(2)O deposited on SS meshes (RuOx/Au/SS) are found to greatly improve the poor contact between SS meshes and electrode materials. The maximum specific capacitance (C-S.RuOx) of RuOx.nH(2)O, 1580 F g(-1) (measured at 1 mV s(-1)), very close to the theoretic value, was obtained from an AC-RuOx/RuOx/Au/SS electrode with 10 wt.% sol-gel-derived RuOx.nH(2)O annealed in air at 200degreesC for 2 h. The highly electrochemical reversibility, high-power characteristics, good stability, and improved frequency response of this AC-RuOx/RuOx/Au/SS electrode demonstrate its promising application potential in supercapacitors. The ultrahigh specific capacitance of RuOx.nH(2)O probably results from the uniform size distribution of RuOx.nH(2)O nanoparticles, ranged from 1.5 to 3 nm which is clearly observed from the high-resolution transmission electron microscopy (HRTEM). (C) 2004 Elsevier Ltd. All rights reserved.