Abstract The effects of the supporting electrolyte on electro-catalytic reaction of hydrazine hydrate (HH) were studied by a platinum ultramicroelectrode. We found that the H+ electric field generated during the catalytic process can partly hinder the reactants from participating in the catalytic reaction by using low concentration supporting electrolytes. It results in the final steady current value is less than the theoretical value. On the other hand, supporting electrolyte has a regulatory effect on both concentrations of N2H4 and N2H5+ (protonated HH) involved in catalytic reaction, which in turn affects the number of steady state currents and the value of each steady state current generated in the reaction. In this case, the effect of neutral salts did not change with concentration variations. By contrast, when different concentrations of sulfuric acid or sodium hydroxide are used as the electrolytes, the number of steady state currents and the value of each steady state current are mainly determined by the original and the later produced H+ concentration around the electrode; while the number of steady state current and the value of each steady state current are co-determined by the thermodynamic equilibrium and the thermodynamics of catalytic reaction of HH, and the H+ absorbability of solution with different concentrations and types of sodium phosphate buffer. Moreover, this work can also provide useful information for the choice of supporting electrolyte and catalytic potential in determination of HH concentration by amperometric method and in catalytic reaction with HH as the redox medium.

中文翻译：

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铂超微电极对肼电氧化的机理研究：支持电解质的影响

摘要 用铂超微电极研究了支持电解质对水合肼（HH）电催化反应的影响。我们发现催化过程中产生的 H+ 电场可以通过使用低浓度的支持电解质来部分阻碍反应物参与催化反应。导致最终稳定电流值小于理论值。另一方面，支持电解质对参与催化反应的 N2H4 和 N2H5+（质子化 HH）的浓度都有调节作用，进而影响稳态电流的数量和反应中产生的每个稳态电流的值。在这种情况下，中性盐的作用不随浓度变化而变化。相比之下，当使用不同浓度的硫酸或氢氧化钠作为电解液时，稳态电流的数量和每个稳态电流的值主要由电极周围原始和后来产生的H+浓度决定；而稳态电流的数量和每个稳态电流的值是由热力学平衡和HH催化反应的热力学，以及不同浓度和类型的磷酸钠缓冲溶液对H+的吸收能力共同决定的。此外，这项工作还可以为支持电解质和催化电位的选择提供有用的信息，用于通过安培法测定 HH 浓度和以 HH 作为氧化还原介质的催化反应。