Single-atom catalysts (SACs), distinguished by their exceptional atomic efficiency and modifiable coordination structures, find wide-ranging applicability, notably in the context of the hydrogen evolution reaction (HER). Herein, we synthesized a TiCT-based Ni single-atom catalyst (Ni SA@N-TiCT) by immersing a single Ni atom into the Ti vacancies of TiCT and using a N-doping strategy. X-Ray adsorption fine structure revealed the formation of local Ni-NC and an unsaturated C-Ni-N bridge configuration for isolated Ni species. Moreover, Ni SA@N-TiCT exhibited an excellent HER performance with an overpotential of 63 mV at 10 mV cm. This work could enable use of MXene-based SACs in the HER.
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