Mechanism and Simulation of Electrochemical Current Oscillations Observed in the H2O2-Reduction Reaction on Platinum Electrodes in Acidic Solutions.
Mechanism and Simulation of Electrochemical Current Oscillations Observed in the H2O2-Reduction Reaction on Platinum Electrodes in Acidic Solutions.
复制标题
酸性溶液中铂电极 H2O2 还原反应中观察到的电化学电流振荡的机理和模拟。
DOI：
10.1246/bcsj.72.1247
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发表时间：
1999
影响因子：
4
通讯作者：
Y. Nakato
中科院分区：
文献类型：
--
作者：
Y. Mukouyama;H. Hommura;Shuji Nakanishi;T. Nishimura;H. Konishi;Y. Nakato
本文通过实验和数学模拟研究了酸性溶液中Pt电极上h2o2还原反应中出现的A和B两种类型的电化学电流振荡机制。振荡A出现在析氢前的势区，而振荡B出现在析氢前的势区。我们得到的相图表明，振荡A和B出现在H+和H2O2浓度及其比例的有限范围内。振荡A的振荡周期随着H2O2浓度的降低和电极电位的负移而增大，主要由低电流状态下的电流密度决定。考虑到所有可能的界面反应（H2O2还原、氢吸附和析氢）的数学模拟再现了振荡A的基本特征，但不能再现振荡b。结果表明，正反馈机制在突变过程中起作用。
Mechanisms of electrochemical current oscillations of two types, named oscillation A and B, both observed for the H2O2-reduction reaction on Pt electrodes in acidic solutions, have been studied experimentally and by mathematical simulation. Oscillation A appears in a potential region just before hydrogen evolution, while oscillation B appears in a region of hydrogen evolution. A phase diagram we obtained has shown that oscillations A and B appear in limited ranges of the H+ and H2O2 concentrations and their ratio. The oscillation period for oscillation A increases with decreasing H2O2 concentration and negative shift of the electrode potential, mainly determined by the current density in the low-current state. Mathematical simulation by taking account of all plausible interfacial reactions (H2O2 reduction, hydrogen adsorption, and hydrogen evolution) reproduces the essential features of oscillation A, but does not reproduce oscillation B. It is shown that a positive feedback mechanism works in sudden tran...