NiFe layered double hydroxide nanosheet arrays for efficient oxygen evolution reaction in alkaline media

Exploring efficient oxygen evolution reaction (OER) catalysts synthesized from low-cost and earth-abundant elements are crucial to the progression of water splitting. In this paper, NiFe layered double hydroxide (LDH) nanosheets were grown on Ni foam (NF) through a straightforward hydrothermal method. The Fe doping effects were systemati-cally investigated by controlling Ni/Fe ratios and Fe valence states, and the in-depth in-fluence mechanisms were discussed. The results indicate that, through controlling structure morphology and enhancing Ni2+ oxidation, NiFeIII(1:1)-LDH displays the best and outstanding OER performance, with a low over potential of 382 mV at 50 mA cm-2, a low Tafel slope of 31.1 mVdec-1 and only 20 mV increase after 10 h continuous test at 50 mA cm-2. To our knowledge, this is one of the best OER electrocatalysts in alkaline media to date. This work provides a facile and novel strategy for the fabrication of bime-tallic LDH catalysts with desired structures and compositions.(C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In this paper, efficient oxygen evolution reaction (OER) catalysts synthesized from low-cost and earth-abundant elements were explored. The NiFe layered double hydroxide (LDH) nanosheets grown on Ni foam (NF) showed outstanding OER performance by controlling structure morphology and enhancing Ni2+ oxidation.