ArticleACS applied materials & interfaces2026
Visualizing Hydrogen Oxidation Reaction Deactivation on a Polycrystalline Pt Electrode Surface Suppressed by Melamine: A Scanning Electrochemical Microprobe Study.
Article in ACS applied materials & interfaces, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Pt supported on carbon black (Pt/C) is generally used as an anode and cathode catalyst in polymer electrolyte fuel cells. Owing to the highly complex surface microstructure of Pt/C, electrochemical studies employing single-crystal Pt surfaces are powerful but insufficient alone for a comprehensive understanding of the catalytic properties and surface modification effects by organic compounds. This study investigated the dependence of the hydrogen oxidation reaction (HOR) activity of a polycrystalline Pt electrode surface on grain crystallographic orientation and the influence of surface modification by melamine. As a prerequisite, the 2D HOR activity map obtained by a scanning electrochemical microprobe was successfully correlated with the 2D grain crystallographic orientation map determined by electron backscatter diffraction by using indentation marks made by a nanoindenter on the electrode surface as a guide. Low-activity grain regions had orientations close to (100), whereas moderate- and high-activity grain regions exhibited orientations close to (110) and (111), respectively. Then, HOR deactivation was monitored in situ by conducting square-wave potential cycling in a 0.1 M NaClO
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