Atomically Dispersed Pt-O Coordination Boosts Highly Active and Durable Acidic Hydrogen Evolution Reaction

Noble metals atomically anchored on supporters has given rise to a series of excellent heterogeneous catalysts. Nevertheless, the stability of single-atom catalysts (SACs) is of great challenge for large-scale practical applications due to their highly unsaturated coordination environment. In this work, a doping confinement strategy was employed to tightly immobilize single atoms from agglomeration and detachment through a strong metal-supporter interaction (MSI) of Pt-O coordination. Combining with theory calculation, the highly oxidized platinum in MoO 3 not only optimize its electronic properties with good conductivity but also offers more active sites towards hydrogen production. This doped system presents a considerable HER performance with an overpotential of 26 ± 1 mV at 10 mA/cm 2 as well as excellent catalytical stability of at least 125 hours in acidic media. It also displays an outstanding mass activity of 500 A/g Pt at an overpotential of 23 mV, which far outstrips that of commercial Pt/C. This work may pave a novel and facile strategy to stabilize SAC for the development of high-performance HER electrocatalysts in future