Electrodeposition of Ni-Mo-P Ternary Alloy Electrocatalyst for Hydrogen Evolution Reactions
摘要
Alkaline water electrolysis is an important method for sustainable hydrogen production, and exploring efficient cathode materials is of utmost importance. In this study, Ni-Mo-P/NF hydrogen evolution cathode materials for alkaline water electrolysis-based hydrogen production were fabricated by electrodeposition method. During this process, with nickel foam (NF) as the substrate, the composition of the plating solution is nickel sulfate, sodium molybdate and sodium hypophosphite. The ions of Ni2+, MoO42− and H2PO2− in the plating solution were reduced and co-deposited on the surface of the foamed nickel, forming a Ni-Mo-P alloy coating. Furthermore, the electrode surface presented a honeycomb-like structure. The Ni-Mo-P/NF cathode electrode material exhibited excellent electrocatalytic performance, as demonstrated by electrochemical performance tests. In a 1 M KOH electrolyte, the hydrogen evolution reaction (HER) has a relatively low overpotential η10 of 0.109 V, with a Tafel slope of 121.8 mV/dec; the AC impedance Rct is 56.47 Ω; the electrochemical specific surface area is 87.6 cm2. This outstanding catalytic activity is attributed to the synergistic effect among Ni, Mo and P. Mo modulates the electronic structure of Ni, enhancing the adsorption and dissociation of water molecules, whereas P increases the overall catalytic efficiency of the material. This study provides valuable references for the development of highly active nonmetal-based cathode materials in the alkaline water electrolysis field