Evidences of CO spillover at a Pt/Pd bimetallic interface during the formic acid oxidation reaction
作者： Gisela C. Luque , María R. Gennero de Chialvo , Abel C. Chialvo
DOI: 10.1016/J.MATCHEMPHYS.2019.04.056
关键词: Formic acid 、 Stripping (chemistry) 、 Chronoamperometry 、 Materials science 、 Inorganic chemistry 、 Intermetallic 、 Bimetallic strip 、 Palladium 、 Voltammetry 、 Platinum
摘要: Abstract The surface diffusion (spillover) through the intermetallic Pt/Pd junction of adsorbed CO (COad) during formic acid electrooxidation reaction (FAO) was analyzed on a bimetallic electrode by chronoamperometry followed stripping voltammetry. An ordered matrix equally spaced square palladium islands platinum substrate prepared Mask-Assisted E-Beam (MAEB) method in order to have large interface length/area relationship. Potential steps were applied 0.5 M HCOOH + 0.5 M H2SO4 solution (0.2 V ≤ Es vs. RHE ≤ 0.5 V) times t ≤ 500 s flow cell. After changing 0.5 M H2SO4, amount COad Pt and Pd measured voltammetric stripping. Under these experimental conditions, pure metals show presence but not Pd. results obtained demonstrate spillover from towards heterometallic junction.
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