Morphology restructuring: MOFs derived Ni3S2@FeCrMoSx/NF as a highly efficient and stable catalyst for water oxidation

Abstract

Exploring low-cost and high-efficiency OER catalysts is still a challenge. In this paper, self-supporting catalyst-Ni3S2@FeCrMoSx/NF was prepared using metal organic frameworks as templates. The morphology of the pre-catalyst has been deeply restructured after the sulfidation reaction, which significantly changes the composition and catalytic performance of the catalyst. The overpotential of Ni3S2@FeCrMoSx/NF is only 144 mV and 241 mV at a current density of 10 and 50 mA cm−2 respectively, the Tafel slope is as low as 45 mV dec−1. And it can maintain good electrochemical stability at a high current density of 100 mA cm−2. The outstanding OER performance of Ni3S2@FeCrMoSx/NF can be attributed to the increase of electrochemical surface area after sulfidation, the synergistic effect among multi-metals and the synergistic effect of polymetallic sulfides generated by sulfidation.