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Anodic response of cystine at highly roughened gold electrodes in perchloric acid media

机译：高氯酸介质中高度粗糙的金电极上胱氨酸的阳极响应

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This manuscript compares the anodic response of the disulfide moiety of cystine at the preanodized surfaces of polished and highly roughened Au rotated disk electrodes (RDEs). The purpose of this study is the determination of the effect that roughening the electrode surface has on the effective number of electrons passed during cystine oxidation. The apparent number of electrons transferred during oxidation of cystine is ca. 10 eq mol(-1) at the highly roughened Au RDE as compared to ca. 6 eq mol(-1) at the polished Au RDE. The transfer of 10 eq mol(-1) corresponds to complete oxidation of the disulfide moiety in cystine to two moles of cysteine sulfonic acid. The specific area of the roughened surface is concluded to be 5-7 times larger than that of the polished surface on the basis of comparisons of double-layer charging currents, current for anodic evolution of O-2, and data obtained by atomic force microscopy (AEM). Therefore, the larger value of n(app) for the roughened electrode is attributed to the electrocatalytic benefit of an increased specific surface area acting within a response mechanism that is believed to involve coadsorption of the reactant, cystine, and hydroxyl radicals generated by anodic discharge of H2O2. [References: 21]
机译：该手稿比较了在抛光和高度粗糙的Au旋转圆盘电极（RDE）的预阳极氧化表面上胱氨酸的二硫键部分的阳极响应。这项研究的目的是确定粗糙化电极表面对胱氨酸氧化过程中通过的有效电子数的影响。在胱氨酸氧化过程中转移的表观电子数约为。与大约ca相比，在高度粗糙的Au RDE上为10 eq mol（-1）。在抛光的Au RDE上为6 eq mol（-1）。 10 eq mol（-1）的转移对应于将胱氨酸中的二硫键部分完全氧化为两摩尔的半胱氨酸磺酸。根据双层充电电流，O-2阳极析出电流和原子力显微镜获得的数据的比较，可以得出粗糙表面的比表面积是抛光表面的比表面积的5-7倍。 （AEM）。因此，粗糙电极的n（app）值较大归因于在响应机制中起作用的比表面积增加的电催化作用，该机制被认为涉及阳极放​​电产生的反应物，胱氨酸和羟基自由基的共吸附。 H2O2。 [参考：21]

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