In-situ generate robust Fe-Ni derived nano-catalyst featuring surface reconstruction for enhanced oxygen evolution reaction

Oxygen evolution reaction (OER) catalysts with highly efficient and cost-effective are cardinal for hydrogen production through water electrolysis. Herein, a novel strategy based on the theory of molecular crystallization and atomic diffusion is described to construct the FeOOH@Ni-3(NO3)(2)(OH)(4)/NF. It requires an overpotential of 248 mV at the current density of 100 mA cm(-2 )for OER. The in-situ Raman spectroscopy test exploring the catalytic actives unravels that NiOOH is one of the real active species and a small amount of NiFe2O4 is generated during OER process. The analysis of the mechanism shows that NiOOH converted from the intermediate product of Ni(OH)(2) derived from Ni-3(NO3)(2)(OH)(4 )in the process of OER. NiOOH and FeOOH mainly work together contributing to boosting intrinsic catalytic activity. This work may provide a new insight into fabricating strategy for other nano -catalysts. The in-situ Raman measurement provides a valid and reliable means to probe into the catalytic active site and catalytic mechanism in the catalytic process.(C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.