S/Se dual-doping promotes the formation of active Ni/Fe oxyhydroxide for oxygen evolution reaction of (sea)water splitting

Surface reconstruction produces metal oxyhydroxide (*OOH) active sites, and promoting surface reconstruction is essential for the design of OER electrocatalysts. In this paper, we reported that a large amount of active NiFeOOH was generated in-situ on the surface of nickel-iron sulfide selenide, thus exposing more active sites and efficiently catalyzing OER. In 1 M KOH solution, NiFeOOH(S,Se) achieves an ultra-low overpotential of 195 mV at the current density of 10 mA cm-2, and the Tafel slope is only 31.99 mV dec-1, showing excellent catalytic performance. When the current density is 100 mA cm-2, the overpotential of NiFeOOH(S,Se) in KOH + seawater solution is 239 mV, which is almost

Automated summary

In this paper, researchers reported a method to generate a large amount of active NiFeOOH through surface reconstruction. These active sites can efficiently catalyze the oxygen evolution reaction (OER) and exhibit excellent catalytic performance.