Ni_1‐xCo_xO_y, Ni_1‐xCo_xS_y and Ni_1‐xCo_xP_y Catalysts Prepared from Ni_1‐xCo_x‐ZIF‐67 for Hydrogen Production by Electrolysis in Alkaline Media

Abstract

Abstract The uniform homeotypic bimetallic Ni 1‐x Co x O y , Ni 1‐x Co x S y and Ni 1‐x Co x P y catalysts were synthesized from Ni 1‐x Co x ‐ZIF‐67 crystals (120‐135 nm) reacting with oxygen, sublimed sulfur and sodium hypophosphite, respectively under control conditions. The catalysts were deposited on glassy carbon electrode (GCE), and their electro‐catalytic activity for hydrogen production in alkaline media by electrolysis was investigated. The electrocatalytic activity of the catalysts towards hydrogen evolution reaction (HER) decreased in the following order Ni 0.1 Co 0.9 P y >Ni 0.2 Co 0.8 O y >Ni 0.5 Co 0.5 S y >Ni 0.1 Co 0.9 ‐ZIF‐67. The Ni 0.1 Co 0.9 P y exhibited the highest electrocatalytic activity towards HER due to the high crystallinity, high specific surface area and the synergistic effect of nickel and cobalt that accelerate the electron transfer process.