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Mechanism of Potential Oscillation Induced by Na_2SO_4 and K_2SO_4 in H_2O_2-H_2SO_4-Pt System

机译:H_2O_2-H_2SO_4-Pt体系中Na_2SO_4和K_2SO_4诱发电位振荡的机理

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摘要

A potential oscillation, named oscillations H, appears in H_2O_2-H_2SO_4-Pt System when salts such as Na_2SO_4 and K_2SO_4 are added to electrolytes, as has been reported in our previous paper (ECS Transactions 58 (2014) 99). The potential range of oscillation H overlaps with the potential region of an N-shaped negative differential resistance (N-NDR) induced by an autocatalytic effect of the formation of Pt-OH. Electrochemical impedance measurements show that oscillation H is classified into a hidden N-NDR oscillator and also that the autocatalytic effect plays an essential role in a positive feedback mechanism in oscillation H. During oscillation H, oxygen bubbles evolve from the electrode surface and the local pH at the surface is basic, which shows that H_2O~- produced from H_2O_2 is oxidized to oxygen and also that the H_2O~- oxidation plays an important role in a negative feedback mechanism in oscillation H.
机译:如我们先前的论文所报道(ECS Transactions 58(2014)99),当将诸如Na_2SO_4和K_2SO_4的盐添加到电解质中时,在H_2O_2-H_2SO_4-Pt系统中会出现一个称为振荡H的潜在振荡。振荡H的电势范围与由Pt-OH的形成的自催化作用引起的N形负微分电阻(N-NDR)的电势区域重叠。电化学阻抗测量结果表明,振荡H被归类为隐藏的N-NDR振荡器,并且自催化效应在振荡H的正反馈机制中也起着至关重要的作用。在振荡H期间,氧气泡会从电极表面和局部pH处逸出。表面的碱是碱性的,这表明由H_2O_2产生的H_2O〜-被氧化为氧气,并且H_2O〜-的氧化在振荡H的负反馈机制中也起着重要的作用。

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  • 来源
    《Systems electrochemistry》|2014年|11-18|共8页
  • 会议地点 Cancun(MX)
  • 作者单位

    Division of Science, School of Science and Engineering, Tokyo Denki University, Hatoyama, Saitama 350-0394, Japan;

    Division of Science, School of Science and Engineering, Tokyo Denki University, Hatoyama, Saitama 350-0394, Japan;

    Department of Applied Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

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