Characterization of hydrous ruthenium oxide/carbon nanocomposite supercapacitors prepared by a colloidal method
Characterization of hydrous ruthenium oxide/carbon nanocomposite supercapacitors prepared by a colloidal method
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DOI：
10.1016/s0378-7753(01)00903-x
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发表时间：
2002-01-15
影响因子：
9.2
通讯作者：
Popov, BN
中科院分区：
文献类型：
--
作者：
Kim, H;Popov, BN
采用胶体法制备了不同RuO2负荷量的非晶态纳米复合材料。发现退火温度对优化该材料的电化学性能至关重要。FT拉曼研究证实，配合物钌经100℃退火后转化为氧化钌。采用循环伏安法计算了RuO2/碳复合电极（40 wt.% Ru）的比电容为407 F/g。RuO2的比电容。通过减去复合材料中碳产生的双层电容的贡献，估计xH(2)O约为863 F/g。透射电子显微镜显示了RuO2的粒径。碳上的xH(2)O约为3nm。当Ru的负荷量增加到60wt .%以上时，RuO2的粒径增加到几微米，导致RuO2的利用率、比表面积和速率能力下降。(C) 2002 Elsevier Science B.V.版权所有
Amorphous nanostructured composite materials with different RuO2 loadings on carbon were prepared by colloidal method. The annealing temperature was found to be critical in optimizing the electrochemical performance of this material. FT Raman study confirmed that ruthenium complex converted to ruthenium oxide after annealing at 100 degreesC. The specific capacitance of RuO2/carbon composite electrode (40 wt.% Ru) was calculated by using cyclic voltammetry, which was to be 407 F/g. The specific capacitance of RuO2.xH(2)O was estimated to be approximately 863 F/g by subtracting the contribution of double layer capacitance resulting from carbon in the composite. Transmission electron microscopy indicated that the particle size of RuO2.xH(2)O on carbon was approximately 3 nm. By increasing the Ru loading over 60 wt.%, the particle size of RuO2 increased up to several micrometers resulting in a decrease of the utilization of RuO2, the specific surface area and the rate capability. (C) 2002 Elsevier Science B.V. All rights reserved.