NiFeRuO x nanosheets on Ni foam as an electrocatalyst for efficient overall alkaline seawater splitting

The electrocatalyst NiFeRuO x /NF, comprised of NiFeRuO x nanosheets grown on Ni foam, was synthesized using a hydrothermal process followed by thermal annealing. NiFeRuO x /NF displays high electrocatalytic activity and stability for overall alkaline seawater splitting: 98 mV@ 10 mA·cm −2 in hydrogen evolution reaction, 318 mV@ 50 mA·cm −2 in oxygen evolution reaction, and a cell voltage of 1.53 V@ 10 mA·cm −2 , as well as 20 h of durability. A solar-driven system containing such a bifunctional NiFeRuO x /NF has an almost 100% Faradaic efficiency. The NiFeRuO x coating around Ni foam is an anti-corrosion layer and also a critical factor for enhancement of bifunctional performances.