The electrochemical SO₂ oxidation reaction (SO₂OR) is a promising alternative to the O₂ evolution reaction for H₂ electrochemical generation. The SO₂OR exhibits a low thermodynamic potential and small kinetic barrier, and Au has been observed to be a very active catalyst. For this material, nonlinear dynamic behavior is observed, which is related to the electrolyte chaotropicity at the solid‐liquid interface. In this work, the influence of the chaotropicity was investigated by electrochemical and spectroelectrochemical techniques, and the main reasons for the dependence on the chaotropicity were investigated. The electrochemical response as a function of the chaotropicity was determined as a function of the mechanism observed, and the reaction pathway selection was related to the intermediate adsorption, which in turn was controlled by the interfacial water structure. The “neutral” chaotropicity was found to be the optimum condition for SO₂OR.

中文翻译：

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阴离子离液性对SO2氧化反应的影响：当观众物种决定反应途径时

电化学SO ₂氧化反应（SO ₂ OR）是用于H ₂电化学生成的O ₂析出反应的有希望的替代方法。SO ₂OR显示出低的热力学势和小的动力学势垒，并且已经观察到Au是非常活泼的催化剂。对于这种材料，观察到非线性动力学行为，这与固液界面处的电解质离液性有关。在这项工作中，通过电化学和光谱电化学技术研究了离液性的影响，并研究了依赖于离液性的主要原因。确定电化学反应与离液性的关系，取决于所观察到的机理，反应路径的选择与中间吸附有关，中间吸附又受界面水结构的控制。发现“中性”离液性是SO ₂ OR的最佳条件。