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EQCM study of Ru and RuO2 surface electrochemistry

机译：Ru和RuO2表面电化学的EQCM研究

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摘要

The present study represents comparative analysis of voltammetric and microgravimetric behavior of active ruthenium (Ru), electrochemically passivated ruthenium (Ru/RuO2) and thermally formed RuO2 electrodes in the solutions of 0.5 M H2SO4 and 0.1 M KOH. It has been found that cycling the potential of active Ru electrode within E ranges 0 V-0.8 V and 0 V-1.2 V in 0.5 M H2SO4 and 0.1 M KOH solutions, respectively, leads to continuous electrode mass increase, while mass changes observed in alkaline medium are considerably smaller than those in acidic one. Microgravimetric response of active Ru electrode in 0.5 M H2SO4 within 0.2 V - 0.8 V has revealed reversible character of anodic and cathodic processes. The experimentally found anodic mass gain and cathodic mass loss within 0.2 - 0.8 V make 2.2 - 2.7 g F-1, instead of 17 g F-1, which is the theoretically predicted value for Ru(OH)(3) formation according to equation: Ru + 3H(2)O -><- Ru(OH)(3) + 3H(+) + 3e(-). In the case of Ru/RuO2 electrode relatively small changes in mass have been found to accompany the anodic and cathodic processes within E range between 0.4 V and 1.2 V in the solution of 0.5 M H2SO4. Meanwhile cycling the potential of thermally formed RuO2 electrode under the same conditions has lead to continuous decrease in electrode mass, which has been attributed to irreversible dehydration of RuO2 layer. On the basis of microgravimetric and voltammetric study as well as the coulometric analysis of the results conclusions are presented regarding the nature of surface processes taking place on Ru and RuO2 electrodes.
机译：本研究代表了在0.5 M H2SO4和0.1 M KOH溶液中活性钌（Ru），电化学钝化钌（Ru / RuO2）和热成型RuO2电极的伏安和微重力行为的比较分析。已经发现，在0.5 M H2SO4和0.1 M KOH溶液中，活性Ru电极的电势分别在E范围0 V-0.8 V和0 V-1.2 V内循环时，会导致连续电极质量增加，而在碱性介质比酸性介质小得多。活性Ru电极在0.5 V H2SO4中的0.2 V-0.8 V范围内的微重力响应显示出阳极和阴极过程的可逆特性。实验发现，在0.2-0.8 V范围内的阳极质量增加和阴极质量损失使2.2-2.7 g F-1代替17 g F-1，这是根据方程式对Ru（OH）（3）形成的理论预测值：Ru + 3H（2）O->-Ru（OH）（3）+ 3H（+）+ 3e（-）。在Ru / RuO2电极的情况下，发现在0.5 M H2SO4溶液中，E范围在0.4 V和1.2 V之间的范围内，阳极和阴极的质量变化相对较小。同时，在相同条件下循环热成型的RuO2电极的电势导致电极质量持续下降，这归因于RuO2层的不可逆脱水。在微重力和伏安研究的基础上，以及对结果进行库仑分析，得出有关在Ru和RuO2电极上发生的表面过程的性质的结论。

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