Abstract

The charge-discharge characteristics and the aging mechanism of PbO₂ layers doped with bismuth in contact with sulfuric acid solutions were studied by using combined cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM) techniques. For this purpose, thick lead dioxide layers (non-doped and doped with Bi) were electrodeposited on gold substrate from aqueous solutions of Pb(NO₃)₂ dissolved in nitric acid and they were investigated in sulfuric acid media. Based on the electrochemical and the mass change responses, it is concluded that during the electrodeposition, bismuth influences the structure of the PbO₂ formed. Bi(III) also inhibits the oxidation of lead sulfate and affects the reduction kinetics of lead dioxide. During successive cyclization (aging), the presence of bismuth accelerates the hydration of PbO₂.

中文翻译：

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用原位EQCM技术研究铋对二氧化铅层电化学性能的影响

摘要

结合循环伏安法和电化学石英晶体微天平（EQCM）技术，研究了铋掺杂的PbO ₂层与硫酸溶液接触时的充放电特性和时效机理。为此，从溶解在硝酸中的Pb（NO ₃）₂水溶液中，在金基底上电沉积厚的二氧化铅层（未掺杂和掺杂Bi），并在硫酸介质中进行研究。根据电化学和质量变化响应，可以得出结论，在电沉积过程中，铋会影响PbO ₂的结构。形成。Bi（III）还抑制硫酸铅的氧化并影响二氧化铅的还原动力学。在连续的环化（老化）过程中，铋的存在会加速PbO ₂的水合作用。