Charge-Redistribution-Driven Dual-Single-Atom Catalysts on MXene for Hydrogen Evolution

Abstract

The hydrogen evolution reaction (HER) exhibits pH- and electrolyte-dependent pathways, imposing intrinsic challenges on the development of catalysts that operate efficiently across wide pH conditions and in seawater electrolysis. Here, we report a dual-single-atom catalyst with proximate cooperative Pt and Ni sites on a MXene (Ti3C2Tx) platform that enables synergistic optimization of HER elementary steps. A one-step molten salt-assisted strategy, free of F-based chemicals, allows the construction of high-density, well-dispersed Pt and Ni single atoms on MXene with well-defined coordination environments. Atomic-resolution microscopy and x-ray absorption spectroscopy confirm the stabilization..