Abstract The electrochemical behavior of PbO2/PbSO4 electrode is investigated in 4.5 M H2SO4 in presence of three surfactants, Sodium Dodecyl Sulfate (SDS), Cetyltrimethylammonium bromide (CTAB) and Sodium tripolyphosphate (STPP), using cyclic voltametry, electrochemical spectroscopy impedance and galvanostatic discharge as techniques. The micro morphology of the surface of the modified PbO2 electrodes is examined by scanning electron microscopy. The results show that SDS and CTAB when added in the electrolyte could refine the coating particles and change the roughness of the surface of the electrode leading to a thin film of PbO2 with amorphous character. In addition, SDS and CTAB shift the hydrogen evolution potential towards more negative values, improve the discharge capacity of the anodic layer and accelerate the charge transfer. Under cathodic polarization, CTAB presents the lowest value of the charge transfer resistance Rct. In the contrary, STPP shifts the oxygen evolution potential towards more positive values, passivates the surface of the electrode and inhibits completely the reaction of PbO2 formation.

中文翻译：

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电解液中表面活性剂存在下PbO2/PbSO4电极的电化学行为

摘要 在 4.5 M H2SO4 中，在十二烷基硫酸钠 (SDS)、十六烷基三甲基溴化铵 (CTAB) 和三聚磷酸钠 (STPP) 存在下，使用循环伏安法、电化学阻抗谱和恒电流放电研究了 PbO2/PbSO4 电极的电化学行为。作为技术。通过扫描电子显微镜检查改性 PbO2 电极表面的微观形态。结果表明，在电解液中加入 SDS 和 CTAB 可以细化涂层颗粒并改变电极表面的粗糙度，从而形成具有无定形特性的 PbO2 薄膜。此外，SDS和CTAB使析氢电位向更负值移动，提高阳极层的放电容量并加速电荷转移。在阴极极化下，CTAB 呈现电荷转移电阻 Rct 的最低值。相反，STPP 使析氧电位向更正值移动，钝化电极表面并完全抑制 PbO2 形成的反应。