The synthesis of hybrid platinum materials is fundamental to enable alkaline water electrolysis for cost-effective H generation. In this work, we have used a galvanostatic method to co-deposit PtNi films onto polycrystalline gold. The surface concentrations of Ni (Γ ) and Pt (Γ ) were calculated from electrochemical measurements; the Γ /Γ ratio and electrocatalytic activity of these materials towards hydrogen evolution reaction (HER) in 1 M KOH show a strong dependence on the current density pulse applied during the electrodeposition. Analysis of the Tafel parameters hints that, on these deposits, HER proceeds through a Volmer-Heyrovsky mechanism. The galvanostatically deposited PtNi layers present a high current output per Pt gram, 3199 A g , which is significantly larger compared to other PtNi-based materials obtained by more extended and more complex synthesis methods.
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| http://dx.doi.org/10.1002/open.202100241 | DOI Listing |
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