Dual-Atom Co/Ni Electrocatalyst Anchored at the Surface-Modified Ti 3 C 2 T x MXene Enables Efficient Hydrogen and Oxygen Evolution Reactions

Dual-atom catalytic sites on conductive substrates offer a promising opportunity for accelerating the kinetics of multistep hydrogen and oxygen evolution reactions (HER and OER, respectively). Using MXenes as substrates is a promising strategy for depositing those dual-atom electrocatalysts, if the efficient surface anchoring strategy ensuring metal-substrate interactions and sufficient mass loading is established. We introduce a surface-modification strategy of MXene substrates by preadsorbing L-tryptophan molecules, which enabled attachment of dual-atom Co/Ni electrocatalyst at the surface of Ti3C2Tx by forming N–Co/Ni-O bonds, with mass loading reaching as high as 5.6 wt %. The electron delocalization…

• NN
  National Natural Science Foundation of China

  Awards: 52177220, U23A200767