Preparation and Study of Ti3C2Tx MXene–Deficient In Situ Anchored Fe−Co Alloy Nanoparticle Electrocatalyst for Hydrolysis and Hydrogenolysis

Abstract The novel two–dimensional MXene material Ti 3 C 2 T x has the advantages of a large specific surface area, adjustable band gap, good electrical conductivity, and high stability. However, the precipitation of hydrogen via electrolytic water splitting over Ti 3 C 2 T x has unacceptably slow kinetics. In this paper, Co nanoparticles were incorporated on the Ti 3 C 2 T x MXene surface via electrostatic adsorption by utilizing the intrinsic MXene defects generated during the etching process. Next, a Fe−Co alloy structure was also constructed on the Ti 3 C 2 T x MXenesurface by wet chemical impregnation method using the principle of galvanic coupling substitution. The prepared catalyst had an overpotential of 118 mV at a current density of 10 mA‐cm −2 and a Tafel slope of 97.56 mV dec −1 . The Fe−Co alloy structure accelerated the kinetic hydrogen precipitation step, and Fe−Co/Ti 3 C 2 T x showed excellent stability when used in a water electrolysis process for 11 h. This work offers a promising strategy for the synthesis of intrinsically defective synthetic alloy MXene structures.