Understanding Cation Effects Through Interfacial Water Structure in Alkaline Hydrogen Evolution on Single-Crystal Platinum Electrodes
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The structure of one of the key model alkaline water electrolysis interfaces – the Pt/aqueous interface - remains poorly understood. Precise in situ structural elucidation is crucial to better understand (and thus, optimise) the factors governing electrocatalytic reactivity. Significant discrepancies in the cation-concentration dependence of the hydrogen evolution reaction activity between Pt(111) and Pt(110) have previously been observed, namely that the former surface displays no cation concentration dependence, whereas the latter displays a marked dependence at the same electrolyte pH. These discrepant trends suggest that the structure of the electrode-electrolyte interface differs significantly between the two Pt facets. To resolve this, we propose the use of in situ high energy surface x-ray diffraction studies to elucidate the effect of cation identity and concentration on the interfacial water structure and near-surface cation arrangement/occupancy near Pt(111) and Pt(110).
