How to achieve maximum utilization of hydrous ruthenium oxide for supercapacitors
How to achieve maximum utilization of hydrous ruthenium oxide for supercapacitors
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DOI：
10.1149/1.1639020
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发表时间：
2004-02-01
影响因子：
3.9
通讯作者：
Chang, KH
中科院分区：
文献类型：
--
作者：
Hu, CC;Chen, WC;Chang, KH
水合氧化钌（表示为RuOx.nH（2）O）的利用率通过在空气中退火氧化物以及通过将其与导电活性炭（AC）混合来促进，这是由于分别在颗粒内和颗粒间电子电导率方面的显著改善。RuOx·nH（2）O的最大比电容（C-S，C-RuOx）为1340 F/g（在25 mV/s下测量），非常接近理论值，由涂覆在石墨上的AC和RuOx·nH（2）O组成的复合物（表示为AC-RuOx/G）获得，其中10wt%的溶胶-凝胶衍生的RuOx·nH（2）O纳米点在空气中在200 ℃下退火2 h。随着RuOx·nH（2）O纳米点平均粒径的增大，紫外吸收光谱的λ（max）向红色方向移动，这归因于表面等离子体共振现象。通过高分辨透射电子显微镜测量得到的RuOx·nH（2）O纳米点的平均粒径为2.05 ~ 3.01 nm。循环伏安和电阻抗测试结果表明，RuOx·nH（2）O纳米点的尺寸和含量对电容性能有重要影响，颗粒间电子电导率对RuOx·nH（2）O的利用率有重要影响. X射线衍射和电子衍射分析表明，在200 ℃空气中退火2 h和未退火的RuOx.nH（2）O纳米点均为非晶态结构。(C)2004年电化学学会。
The utilization of hydrous ruthenium oxide (denoted as RuOx.nH(2)O) was promoted by annealing the oxide in air as well as by mixing it with conductive activated carbon (AC) due to the significant improvement in intra- and interparticle electronic conductivity, respectively. The maximum specific capacitance (C-S,C-RuOx) of RuOx.OnH(2)O, 1340 F/g (measured at 25 mV/s), very close to the theoretic value, was obtained from a composite consisting of AC and RuOx.nH(2)O coated on graphite (denoted as AC-RuOx/G) with 10 wt % of sol-gel-derived RuOx.nH(2)O nanodots annealed in air at 200 degreesC for 2 h. The UV absorption spectral features showed a shift in lambda(max) to the red as the mean particle size of RuOx.nH(2)O nanodots was increased, attributable to the surface plasmon resonance phenomenon. The average particle size of highly uniform RuOx.nH(2)O nanodots, ranged from 2.05 to 3.01 nm, was estimated from the high-resolution transmission electron microscopy. The dependence of capacitive performance on the size and content of RuOx.nH(2)O nanodots, evidenced by cyclic voltammetry and electrical impedance spectroscopy results, revealed the important influences of interparticle electronic conductivities on the utilization of RuOx.nH(2)O. The RuOx.nH(2)O nanodots with and without annealing in air at 200 degreesC for 2 h showed the amorphous structure from both the X-ray diffraction and electron diffraction analysis. (C) 2004 The Electrochemical Society.