Abstract
The robustness of NiFe-based oxygen evolution reaction (OER) electrocatalysts is a bottleneck in alkaline industrial water cracking. Herein, the effects of trace Fe doping and leaching-readsorption of VO43− on the activity and stability of activated nickel-vanadium oxide (NVO) were investigated. As a result, the controlled leaching of VO43− created sufficient oxygen vacancies (Ov) for surface reconstruction to NiFeOOH, while its moderate readsorption promoted the diffusion of OH−. The modulated NVO (aFe-NVO) has an overpotential of only 340 mV at 1000 mA cm−2 and can operate stably for 100 h. Density functional theory calculations (DFT) show that the synergistic interaction between sufficient OV, Fe doping and the leaching-readsorption of VO43− optimizes the adsorption of OH−, and significantly reduces the energy barrier of rate-determining step (RDS) (*OH → *O). Furthermore, the assembly of aFe-NVO in alkaline anion exchange membrane (AEM) cells resulted in a cell voltage of 1.95 V at 1000 mA cm−2 and stable operation for 100 h.
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