非線形現象  H2O2‐H2SO4‐Pt系における電気化学振動現象の外部電位パルスによる変調

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  • Nonlinear Phenomena. Modulation of Electrochemical Oscillations in an H2O2-H2SO4-Pt System by External Potential Pulses.
  • H2O2-H2SO4-Ptケイ ニ オケル デンキ カガク シンドウ ゲンショウ ノ ガイブ デンイ パルス ニ ヨル ヘンチョウ

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Two electrochemical oscillations, named oscillation A and B, are observed in H2O2 reduction reaction on Pt electrodes in aqueous acidic solutions. Oscillation A appears in potentials just before H2 evolution, whereas oscillation B appears in the potential region of H2 evolution. Both oscillations are caused by alternate occurrence of H2O2 reduction and suppression of the H2O2 reduction by adsorbed hydrogen (upd-H). It is found that synchronized current oscillations are induced by external potential pulses when they are positive and located in the low-current state of oscillation. This result can be explained to be due to removal of upd-H by the positive potential pulses which lead to positive shifts of the electrode potential. The relation between the duration of the low-current state and the peak current of the high-current state is investigated and the result supports our previously propose oscillation mechanism.

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