Ce‐Modified Ni(OH)₂ Nanoflowers Supported on NiSe₂ Octahedra Nanoparticles as High‐Efficient Oxygen Evolution Electrocatalyst

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Exploring and developing high‐efficiency electrocatalysts for the oxygen evolution reaction (OER) is desirable yet challenging for cost‐effective transformation of renewable electricity into fuels and chemicals. Herein, a self‐supported electrode of nanoflower‐like Ce‐modified Ni(OH) 2 grown on high‐conductivity NiSe 2 octahedra nanoparticles is designed and fabricated for the first time. By virtue of i) the high conductivity of the NiSe 2 support for favorable electron transfer; ii) the open porous structure from the nanoflower‐like Ce‐modified Ni(OH) 2 for beneficial mass transport; iii) Ce doping for efficiently optimizing the energetics for OER intermediates based on density functional theory simulations; and iv) Ce(OH) 3 embedding for efficacious oxygen ion exchange and electronic transmission, the electrode exhibits remarkable OER activity with a very low overpotential of 158 mV at 10 mA cm −2 and Tafel slope of 27 mV dec −1 , which outperform almost all OER electrocatalysts.