Spatially Segregated Pt/Co Dual Single-Atoms on Janus MXene Synergistically Boost Electrocatalytic Overall Water Splitting

with a 200 h stability. In situ/operando spectroscopy and DFT calculations unveil that Pt/Co DSAs synergistically induce charge redistribution on the MXene surface, thus optimizing the active-site electronic states and intermediate adsorption to lower the reaction energy barrier. Our strategy serves as a pathway for atomically precise control of MXene-supported single-atom sites toward selective electrocatalysis.