Open AccessGalvanostatically Deposited PtNi Thin‐Films as Electrocatalysts for the Hydrogen Evolution Reaction
Author(s) -
MedranoBanda Alejandra,
CrespoYapur Alfonso,
VelascoSoto Miguel Ángel,
Videa Marcelo
Publication year - 2022
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.202100241
Subject(s) - tafel equation , electrolysis , electrochemistry , electrolysis of water , platinum , hydrogen production , materials science , chemical engineering , crystallite , electrocatalyst , hydrogen , catalysis , inorganic chemistry , nanotechnology , chemistry , electrode , metallurgy , electrolyte , organic chemistry , engineering
The synthesis of hybrid platinum materials is fundamental to enable alkaline water electrolysis for cost‐effective H 2 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.