首页> 外文期刊>Russian journal of electrochemistry >Electroreduction of Peroxodisulfate Anion at Platinum Rotating Disc Electrode in the Cyclic Voltammetry Mode
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Electroreduction of Peroxodisulfate Anion at Platinum Rotating Disc Electrode in the Cyclic Voltammetry Mode

机译:循环伏安法在铂旋转盘电极上对过二硫酸根阴离子的电还原

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摘要

Electroreduction of peroxodisulfate anion at smooth polycrystalline and platinized (at different deposition potentials) platinum in perchloric acid and sulfuric acid solutions is studied by rotating disc electrode and cyclic voltammetry techniques. Dependences of the process rate on the electrode rotating velocity, the potential scan rate, the anodic limit of the scanning, the peroxodisulfate anion concentration in the solution and the platinizing conditions are found. The suggestion on the complications in the peroxodisulfate anion reduction caused by adsorbate formation is corroborated, at least, for certain potential region. The reaction structure sensitivity is evidenced, which makes it possible to use the reaction for characterization of the platinized Pt surface structure. The comparing of obtained results with literature data concerning smooth platinum and the single-crystal platinum basis faces allows concluding that the peroxodisulfate anion reduction maximal rate in sulfuric-acid solutions occurs at the potentials close to those observed for the (110) face. When the platinized Pt surface roughness factor exceeds ~30, the peroxodisulfate anion reduction reaction proceeds under the inner-diffusion limitation control. The platinized-Pt rotating disc electrode can serve as model tool in the studying of properties of disperse material microdeposits.
机译:通过旋转圆盘电极和循环伏安法研究了在高氯酸和硫酸溶液中平滑多晶和铂(在不同沉积电位下)铂下过氧二硫酸根阴离子的电还原。发现处理速率与电极旋转速度,电势扫描速率,扫描的阳极极限,溶液中的过二硫酸根阴离子浓度和镀铂条件有关。至少在某些潜在区域,证实了关于由吸附物形成引起的过二硫酸根阴离子还原的并发症的建议。证明了反应结构的敏感性,这使得可以将反应用于表征镀铂的Pt表面结构。将获得的结果与有关光滑铂和单晶铂基面的文献数据进行比较,可以得出结论,硫酸溶液中的过二硫酸盐阴离子最大还原速率发生在接近于(110)面所观察到的电势下。当铂化的Pt表面粗糙度因子超过〜30时,过二硫酸根阴离子还原反应在内部扩散限制控制下进行。铂铂转盘电极可作为研究分散材料微沉积物性能的模型工具。

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