Co 3 O 4 ‐RuO 2 /Ti 3 C 2 T x MXene Electrocatalysts for Oxygen Evolution Reaction in Acidic and Alkaline Media

Abstract MXene 2D materials and non‐noble transition metal oxide nanoparticles have been proposed as novel pH‐universal platforms for oxygen evolution reaction (OER), owing to the enhancement of active site exposures and conductivity. Herein, Co 3 O 4 ‐RuO 2 /Ti 3 C 2 T x /carbon cloths (CRMC) were assembled in a facile way as an efficient OER platform through a hydrothermal process. The Co 3 O 4 ‐RuO 2 /Ti 3 C 2 T x demonstrated prominent OER catalytic performance under acidic and alkaline conditions, which showed overpotential values of 195 and 247 mV at 10 mA cm −2 with Tafel slopes of 93 and 97 mVdec −1 , respectively. The experimental results demonstrated that the electron transfer from Co 3 O 4 ‐RuO 2 to Ti 3 C 2 T x /carbon cloth played a remarkable role in promoting OER catalytic activity. Further OER characterization indicated that the enhanced multi‐electron reaction kinetics are attributed to Co and Ru acting as the primary active places for O 2 adsorption and activation, which facilitated the generation of *OOH intermediate.