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Atomic-Scale Identification of the Electrochemical Roughening of Platinum.
ACS Central Science ( IF 12.7 ) Pub Date : 2019-11-15 , DOI: 10.1021/acscentsci.9b00782 Leon Jacobse 1, 2 , Marcel J Rost 3 , Marc T M Koper 1
ACS Central Science ( IF 12.7 ) Pub Date : 2019-11-15 , DOI: 10.1021/acscentsci.9b00782 Leon Jacobse 1, 2 , Marcel J Rost 3 , Marc T M Koper 1
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Electrode degradation under oxidizing conditions is a major drawback for large-scale applications of platinum electrocatalysts. Subjecting Pt(111) to oxidation-reduction cycles is known to lead to the growth of nanoislands. We study this phenomenon using a combination of simultaneous in situ electrochemical scanning tunneling microscopy and cyclic voltammetry. Here, we present a detailed analysis of the formed islands, deriving the (evolution of the) average island growth shape. From the island shapes, we determine the densities of atomic-scale defect sites, e.g., steps and facets, which show an excellent correlation with the different voltammetric hydrogen adsorption peaks. Based on this combination of electrochemical scanning tunneling microscopy (EC-STM) and CV data, we derive a detailed atomistic picture of the nanoisland evolution during potential cycling, delivering new insights into the initial stages of platinum electrode degradation.
中文翻译：
铂电化学粗化的原子尺度鉴定。
在氧化条件下电极降解是铂电催化剂大规模应用的主要缺点。已知使Pt（111）经历氧化还原循环会导致纳米岛的生长。我们结合原位电化学扫描隧道显微镜和循环伏安法研究了这种现象。在这里，我们对形成的岛屿进行详细分析，得出平均岛屿生长形状（的演变）。从岛的形状，我们确定原子级缺陷位点（例如台阶和刻面）的密度，这些缺陷位点与不同的伏安氢吸附峰之间显示出极好的相关性。基于电化学扫描隧道显微镜（EC-STM）和CV数据的结合，
更新日期：2019-12-27
中文翻译：
铂电化学粗化的原子尺度鉴定。
在氧化条件下电极降解是铂电催化剂大规模应用的主要缺点。已知使Pt（111）经历氧化还原循环会导致纳米岛的生长。我们结合原位电化学扫描隧道显微镜和循环伏安法研究了这种现象。在这里，我们对形成的岛屿进行详细分析，得出平均岛屿生长形状（的演变）。从岛的形状，我们确定原子级缺陷位点（例如台阶和刻面）的密度，这些缺陷位点与不同的伏安氢吸附峰之间显示出极好的相关性。基于电化学扫描隧道显微镜（EC-STM）和CV数据的结合，
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