Deciphering the Exceptional Performance of NiFe Hydroxide for the Oxygen Evolution Reaction in an Anion Exchange Membrane Electrolyzer

Hydrogen production via water electrolysis with renewable electricity as input will be crucial for the coming defossilized energy age. Herein, we report an anion exchange membrane electrolyzer using Fe-doped Ni hydroxide as an anode catalyst that is on par with proton exchange membrane electrolyzers in terms of the performance, 2 A cm(-2) at 2.046 V and 50 degrees C. We found that Fe doping stabilizes the alpha-Ni(OH)(2) phase, which is key to ensure the fast Ni(OH)(2)/NiOOH redox transition and the subsequent fast reaction between Ni3+/4+ and the electrolyte (OH-), resulting in the excellent oxygen evolution reaction activity of Fe-doped Ni hydroxide. Spin-polarized DFT + U computations reveal that the local arrangement of Fe3+ with Ni3+/4+ plays a crucial role in enabling the high OER activity on the (001) facet of this anode catalyst.

Automated summary

Hydrogen production through water electrolysis using renewable electricity is crucial for the future defossilized energy era. In this study, an anion exchange membrane electrolyzer with Fe-doped Ni hydroxide as an anode catalyst was found to exhibit similar performance as proton exchange membrane electrolyzers, with excellent oxygen evolution reaction activity.