2D MXene Ti3C2 Coupled with 1D Co3O4 Nanowires on Carbon Cloth for Efficient Chlorine Evolution Activity

Abstract Chlorine evolution reaction (CER) is a key anode reaction in chlor‐alkali electrolysis. Although non‐precious metals have been widely used as CER catalysts, their low catalytic activity has been a major constraint on their development. Herein, 1D Co 3 O 4 coupled with 2D Ti 3 C 2 MXene on carbon cloth for highly efficient CER is reported by constructing two different heterojunctions (1D Co 3 O 4 tip to 2D Ti 3 C 2 face and 1D face to 2D face) through electronic coupling and strong interfacial interaction. The decreased electron density around O atoms in Co─O and Ti─O at two heterojunctions is more conducive to the adsorption of Cl − , thereby reducing the free energy of the reaction and jointly promoting CER. Consequently, the MXene@Co 3 O 4 /CC (carbon cloth) exhibits a low overpotential of 86 mV at 10 mA cm −1 , low tafel slope of 47.9 mV dec −1 , which is superior to commercial DSA and other non‐precious metal materials. This work provides new insights into the rational design of multiple heterojunctions, which leads to a new path for non‐precious metal catalysts in CER.