Amorphous Ruthenium‐Chromium Oxides for Electrochemical Capacitors
Amorphous Ruthenium‐Chromium Oxides for Electrochemical Capacitors
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用于电化学电容器的非晶态钌铬氧化物
DOI：
10.1149/1.1391003
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发表时间：
1999
影响因子：
--
通讯作者：
A. Manthiram
中科院分区：
文献类型：
--
作者：
Y. Jeong;A. Manthiram
非晶态 Ru1-yCryO2·xH2O 是通过在 pH ≥ 6.5 下用 RuCl3·xH2O 还原 K2Cr2O7 水溶液，然后在 T≤ 200 C 的空气中干燥来合成的。通过 X 射线粉末衍射、使用波长色散光谱的元素分析、热重分析和表面积测量对样品进行了表征。样品中的 Cr 含量 y 取决于反应 pH 值。非晶态样品在加热至 T > 250 C 时转变成结晶金红石型 Ru1-yCryO2。 Cr 取代的 Ru1-yCryO2·xH2O 样品表现出比未取代的 RuO2·xH2O (720 F/g) 更高的电容值 (高达约 840 F/g)。尽管 Cr 含量较高的样品的容量往往会衰减，但 Cr 含量较低的样品可实现良好的循环性能，初始电容约为 740 F/g y≈ 0.15。© 2000 The Electrochemical Society。 S1099-0062 (99) 11-066-6。版权所有。
Amorphous Ru1-yCryO2· xH2O has been synthesized by a reduction of aqueous K2Cr2O7 with RuCl3· xH2O at≥ pH 6.5 followed by drying in air at T≤ 200 C. The samples have been characterized by X-ray powder diffraction, elemental analysis using wavelength dispersive spectroscopy, thermogravimetric analysis, and surface area measurements. The Cr content, y, in the samples depends on the reaction pH. The amorphous samples transform into crystalline rutile-type Ru1-yCryO2 on heating to T> 250 C. The Cr-substituted Ru1-yCryO2· xH2O samples exhibit higher capacitance values (up to about 840 F/g) than the unsubstituted RuO2· xH2O (720 F/g). Although the capacity tends to fade for samples with higher Cr content, good cyclability with an initial capacitance of around 740 F/g could be achieved for samples with lower Cr content y≈ 0.15.© 2000 The Electrochemical Society. S1099-0062 (99) 11-066-6. All rights reserved.