CHARACTERIZATION OF OXIDE-FILMS ELECTROCHEMICALLY DEPOSITED FROM SOLUTIONS OF PALLADIUM-CHLORIDE AND SODIUM HEXACHLOROIRIDATE
CHARACTERIZATION OF OXIDE-FILMS ELECTROCHEMICALLY DEPOSITED FROM SOLUTIONS OF PALLADIUM-CHLORIDE AND SODIUM HEXACHLOROIRIDATE
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DOI：
10.1016/0022-0728(92)80105-d
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发表时间：
1992-03-23
影响因子：
4.5
通讯作者：
STROHMEIER, BR
中科院分区：
文献类型：
--
作者：
JAWORSKI, RK;COX, JA;STROHMEIER, BR
铂电极和玻碳电极在含有1.0 mM PdCl2和2.0 mM Na2IrCl6的酸性混合物中循环伏安，生成一层主要为Ir氧化物的薄膜。0.75亩厚薄膜的钯含量约为0.2at.%。在盐酸溶液中循环时，钯的表面浓度降至X射线光电子能谱的检测下限以下。在pH关系实验中，在pH为1-5和6-10的范围内观察到两个线性区域，斜率分别为62 mV(pH单位)-1和83 mV(pH单位)-1。循环伏安峰电位与pH的关系曲线与电位数据相符。在酸性和碱性范围内，薄膜氧化的电荷输运系数都低于还原的电荷输运系数。在pH 1.15的盐酸溶液中，其值分别为5×10~(-9)cm~2·S~(-1)和8×10~(-9)cm~2·S~(-1)。
Cyclic voltammetry of platinum and glassy carbon electrodes in an acidic mixture containing 1.0 mM PdCl2 and 2.0 mM Na2IrCl6 yields a film that is primarily iridium oxide. The palladium content of a 0.75-mu-m film is about 0.2 at.%. The surface concentration of palladium drops to below the detection limit of X-ray photoelectron spectroscopy when the film is cycled in HCI solution. In potentiometric experiments as a function of pH, two linear regions, over the pH ranges 1-5 and 6-10, with respective slopes of 62 mV (pH unit)-1 and 83 mV (pH unit)-1, are observed. Plots of cyclic voltammetric peak potentials vs. pH are commensurate with the potentiometric data. Charge transport coefficients for the oxidation of the film are lower than for the reduction in both acidic and basic ranges. In pH 1.15 HCl solution the respective values are 5 x 10(-9) cm2 s- 1 and 8 x 10(-9) cm2 s-1.