Unraveling the surface self-reconstruction of Fe-doped Ni-thiophosphate for efficient oxygen evolution reaction.

Surface self-reconstruction of oxygen evolution reaction (OER) electrocatalysts generally occurs during the electrochemical activation process. Herein, we study the surface self-reconstruction of a 2D layered Fe-doped Ni-thiophosphate (Ni x Fe 1- x PS 3 ) nanosheet. The role of Fe in the surface self-reconstruction of NiPS 3 during the OER is investigated by using an in situ Raman analysis. Formation of amorphous metal/non-metal oxide layers on the surface of Ni x Fe 1- x PS 3 can efficiently act as the ultimate catalytic center for the OER.