RuO2/TiO2/MXene with multi-heterojunctions coating on carbon cloth for high-activity chlorine evolution reaction at large current densities
Yuhao Duan, Liuxu Wei, Chenyu Cai, Junbao Mi, Fuyuan Cao, Jiaze Chen, Xiaolong Li, Xiujiang Pang, Bin Li, Lei Wang
Abstract
The chlorine evolution reaction (CER) is a crucial step in the production of chlorine gas and active chlorine by chlor-alkali electrolysis. Currently, the endeavor to fabricate electrodes capable of yielding high current density at minimal overpotential remains a central challenge in advancing the realm of chlorine evolution reactions. Here, we grow TiO2 and RuO2 on MXene@carbon cloth (CC) through the favorable affinity and induced deposition effect between the surface functional groups of MXene and the metal. A self-supported electrode (RuTiO2/MXene@CC) with strong binding at the electrocatalyst–support interface and weak adhesion at electrocatalyst–bubble interface is constructed. The RuTiO2/MXene@CC can reduce the electron density of RuO2 by regulating the electron redistribution at the heterogeneous interface, thus enhancing the adsorption of Cl−. RuTiO2/MXene@CC could achieve a high current density of 1000 mA·cm−2 at a small overpotential of 220 mV, superior to commercial dimensionally stable anodes (DSA). This study provides a new strategy for constructing efficient CER catalysts at high current density.