The activated electro-oxidation of sulphur dioxide on smooth platinum
The activated electro-oxidation of sulphur dioxide on smooth platinum
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DOI：
10.1016/0013-4686(83)80008-5
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发表时间：
1983-08
影响因子：
6.6
通讯作者：
R. Spotnitz;J. Colucci;S. Langer
中科院分区：
文献类型：
--
作者：
R. Spotnitz;J. Colucci;S. Langer
本文研究了二氧化硫在硫酸溶液中的铂电阻电化学行为。使这些溶液中的电位在约-0.10至1.2 Vsc之间循环导致电极活化，使得在铂的双层区域中可以观察到扩散控制的SO2氧化电流。在没有活化的情况下，SO2氧化仅在表面氧化物形成的潜在区域显著进行。证据表明，活化结果从形成的催化层的硫物种。在SO_2氧化过程中，该层的催化活性随时间衰减。通过吸附的硫的氧化形成硫氧化物和铂氧化物的形成使系统的伏安行为复杂化。
The electrochemical behaviour of sulphur dioxide in sulphuric acid solutions at a platinumrdeis characterized. Cycling the potential in these solutions between about −0.10 and 1.2 Vsceresults in activation of the electrode so that diffusion-controlled SO2oxidation currents can be observed in the double layer region of platinum. Without activation, SO2oxidation proceeds noticeably only in the potenial region of surface oxide formation. Evidence is presented which indicates that activation results from formation of a catalytic layer of sulphur species. The catalytic activity of this layer decays with time in the course of SO2oxidation. The formation of sulphur oxides through oxidation of adsorbed sulphur and the formation of platinum oxides complicate the voltammetric behaviour of the system.