Constructing weak Ru–Mo metallic bonds to suppress Ru overoxidation for durable acidic water oxidation

Abstract

Although reducing the Ru–O covalency suppresses the loss of lattice oxygen, it also weakens the electron transfer of the Ru–O_bri–Mo configuration, leading to Ru overoxidation. Herein, doping Mo into RuO₂ weakens the Ru–O covalency and forms weak Ru–Mo metallic bonds to compensate for the electron density of Ru, where the Mo_0.125Ru_0.875O₂ catalyst exhibits stable PEM performance at 300 mA cm⁻² for 500 h.