Bimetallic Selenide NiCo‐Se/CFP as Effective Oxygen Evolution Reaction Electrocatalyst for Electrocatalytic Water Splitting

Abstract The industrial application of green hydrogen production from water electrolysis strongly depends on the invention of low‐cost, highly‐active, and stable nonprecious electrocatalysts for an oxygen evolution reaction (OER). In this work, a two‐step process is developed to prepare a NiCo‐Se/CFP bimetallic electrocatalyst by a low‐temperature selenization of NiCo‐PBA precursors electro‐deposited on carbon fibre paper. The NiCo‐Se/CFP bimetallic electrocatalyst exhibits good catalytic activity for the OER, with an overpotential of 307 mV at 10 mA cm −2 , and a Tafel slope of only 39.94 mV dec −1 in 1 M KOH. The steady current density and well‐preserved microscopic morphology during the 20 h electrolysis proves its outstanding stability. The high inherent activity of the electrocatalyst is attributed to the 3D porous structure, the synergistic effects of Ni, and Co active components doping, and low‐temperature selenization. The results provide an insightful reference for further improving composition and structure design while investigating nonprecious metal electrocatalysts.