New Current and Potential Oscillations for Reduction Reactions on Platinum Electrodes in Acid Solutions Containing High Concentration Hydrogen Peroxide
New Current and Potential Oscillations for Reduction Reactions on Platinum Electrodes in Acid Solutions Containing High Concentration Hydrogen Peroxide
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含高浓度过氧化氢的酸溶液中铂电极还原反应的新电流和电势振荡
DOI：
10.1149/1.1837733
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发表时间：
1997
影响因子：
3.9
通讯作者：
Y. Nakato
中科院分区：
文献类型：
--
作者：
T. Matsuda;H. Hommura;Y. Mukouyama;S. Yae;Y. Nakato
除了已报道的一种电化学振荡(称为振荡A)外，还出现了一种新的电化学振荡(称为振荡B)，用于在含过氧化氢的酸性溶液中，当H_2O_2浓度较高时，铂电极上的还原反应。此外，除很高浓度(≥1.1M)外，随着H_2O_2浓度的增加，振荡A变得更加明显和稳定。振荡A出现在临氢之前的一个窄势区，而振荡B出现在一个临氢的势区。振荡A和B都受到H+和H2 O2浓度的强烈影响，表明它们是由于H2 O2和H+还原的竞争而产生的。结果表明，振荡A的高、低电流状态分别对应于H2 O2还原和几乎无H2 O2还原(也不放氢)，而振荡B的高、低电流状态分别对应于H2 O2还原和析氢.定性地讨论了这些态之间突然跃迁的机制。
A new electrochemical oscillation (called oscillation B) appears, in addition to a reported one (called oscillation A), for reduction reactions on platinum electrodes in acid solutions containing hydrogen peroxide in case where the H 2 O 2 concentration is made high. Also, oscillation A becomes more pronounced and more stable as the H 2 O 2 concentration increases except the case of very high concentrations (≥1.1 M). Oscillation A appears in a narrow potential region just before hydrogen evolution, whereas oscillation B appears in a potential region of hydrogen evolution. Both oscillation A and B are strongly affected by the concentrations of H + as well as H 2 O 2 , suggesting that they arise from the competition between the H 2 O 2 and H + reduction. It is concluded that the high and low current states for oscillation A correspond to the H 2 O 2 reduction and almost no H 2 O 2 reduction (nor hydrogen evolution), respectively, whereas the high and low current states for oscillation B correspond to the H 2 O 2 reduction and hydrogen evolution, respectively. Mechanisms for sudden transitions between these states are discussed qualitatively.