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Galvanostatically Deposited PtNi Thin-Films as Electrocatalysts for the Hydrogen Evolution Reaction.

ABSTRACT: The synthesis of hybrid platinum materials is fundamental to enable alkaline water electrolysis for cost-effective H₂ generation. In this work, we have used a galvanostatic method to co-deposit PtNi films onto polycrystalline gold. The surface concentrations of Ni (Γ_Ni ) and Pt (Γ_Pt ) were calculated from electrochemical measurements; the Γ_Pt /Γ_Ni 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_Pt ^-1 , which is significantly larger compared to other PtNi-based materials obtained by more extended and more complex synthesis methods.

SUBMITTER: Medrano-Banda A

PROVIDER: S-EPMC8805383 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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Galvanostatically Deposited PtNi Thin-Films as Electrocatalysts for the Hydrogen Evolution Reaction.

Medrano-Banda Alejandra A Crespo-Yapur Alfonso A Velasco-Soto Miguel Ángel MÁ Videa Marcelo M

ChemistryOpen 20220201 2

The synthesis of hybrid platinum materials is fundamental to enable alkaline water electrolysis for cost-effective H2 generation. In this work, we have used a galvanostatic method to co-deposit PtNi films onto polycrystalline gold. The surface concentrations of Ni (ΓNi ) and Pt (ΓPt ) were calculated from electrochemical measurements; the ΓPt /ΓNi ratio and electrocatalytic activity of these materials towards hydrogen evolution reaction (HER ...[more]

PMID: 35103419

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