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首页> 外文期刊>Journal of solid state electrochemistry >Modification of a Pt surface by spontaneous Sn deposition for electrocatalytic applications.2.Oxidation of CO,formaldehyde,formic acid,and methanol
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Modification of a Pt surface by spontaneous Sn deposition for electrocatalytic applications.2.Oxidation of CO,formaldehyde,formic acid,and methanol

机译：通过自发的Sn沉积修饰Pt表面以用于电催化应用2.CO，甲醛，甲酸和甲醇的氧化

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摘要

The electrocatalytic activity of a spontaneously tin-modified Pt catalyst,fabricated through a simple "dip-coating" method under open-circuit conditions and characterized using surface analysis methods,was studied in electrooxidation reactions of a preadsorbed CO monolayer and continuous oxidation of methanol,formic acid,and formaldehyde in the potentiodynamic and potentiostatic modes.The catalytic activity of the tin-modified Pt surface is compared with that of a poly-crystalline Pt electrode.Spontaneously Sn-modified Pt catalyst shows a superior activity toward adsorbed CO oxidation and thus can be promising for PEFC applications.The methanol oxidation rate is not enhanced on the Sn-modified Pt surface,compared to the Pt electrode.Formic acid oxidation is enhanced in the low potential region on the Sn-modified surface,compared to the Pt electrode.The formaldehyde oxidation rate is dramatically increased by modifying tin species at the most negative potentials,where anodic formaldehyde oxidation is completely suppressed on the pure Pt electrode.The results are discussed in terms of poisoning CO intermediate formation resulting from dehydroge-nation of organic molecules on Pt sites,and oxidation of poisoning adsorbed CO species via the surface reaction with OH adsorbed on neighboring Sn sites.
机译：在开路条件下通过简单的“浸涂”方法制备并使用表面分析方法表征的自发锡改性Pt催化剂的电催化活性，已在预吸附的CO单层的电氧化反应和甲醇的连续氧化中进行了研究，甲酸和甲醛在电位和恒电位模式下进行了比较。将锡改性的Pt表面的催化活性与多晶Pt电极的催化活性进行了比较.Sn改性的Pt催化剂对吸附的CO氧化表现出优异的活性，因此与Pt电极相比，Sn修饰的Pt表面上的甲醇氧化速率不会提高.Sn修饰的表面上的低电势区域中的甲酸氧化相对于Pt电极而言会增强。通过在最负电势下修饰锡物种，可显着提高甲醛的氧化速率，其中阳极甲醛是纯Pt电极上的氧化被完全抑制。结果讨论了Pt部位有机分子脱氢导致的CO中毒形成中间产物，以及通过与邻域吸附的OH发生表面反应而中毒吸附的CO物种的氧化锡站点。

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