Recently, the team led by Researcher Yang Hui from the Shanghai Advanced Research Institute of the Chinese Academy of Sciences and Ningbo Zhongke Kechuang have made important progress in the research and development of iridium-based catalysts for the anode of proton exchange membrane water electrolyzers (PEMWE). Traditional IrO? catalysts follow the adsorption evolution mechanism (AEM), which is restricted by the linear relationship and it is difficult to break through the intrinsic activity. Lattice oxygen mechanism (LOM) By directly utilizing lattice oxygen to participate in the reaction, the energy barrier limitation can be broken, but it will cause the loss of lattice oxygen and weaken the Ir-O bond. The team proposed a sulfur-mediated IrO2 catalyst (IrO2/S) to switch the OER pathway from the traditional AEM to LO