Self-supported MXene/NiMoO4 as efficient and stable electrocatalysts for oxygen evolution reaction

a MXene/NiMoO 4 /NF composite electrode was successfully prepared by synthesizing nanoneedle NiMoO 4 on nickel foam (NF) via a hydrothermal method, followed by spray-coating with a MXene dispersion. The formed three-dimensional porous network provided a hierarchical catalytic interface with abundant active sites. Electrochemical tests demonstrated outstanding oxygen evolution reaction (OER) activity with overpotentials of 153 mV and 241 mV at 10 and 50 mA cm −2 , respectively. The Tafel slope of 38 mV dec −1 indicated rapid reaction kinetics, with the enhanced performance attributed to the synergistic effect between MXene and NiMoO 4 and the hierarchical interface structure.