Highly active, cost‐effective, and durable catalysts for oxygen evolution reaction (OER) are required in energy conversion and storage processes. A facile synthesis of CoFe layered double hydroxide (CoFe LDH) is reported as a highly active and stable oxygen evolution catalyst. By varying the concentration of the metal ion precursor, the Co/Fe ratios of LDH products can be tuned from 0.5 to 7.4. The structure and electrocatalytic activity of the obtained catalysts were found to show a strong dependence on the Co/Fe ratios. The Co2Fe1 LDH sample exhibited the best electrocatalytic performance for OER with an onset potential of 1.52 V (vs. the reversible hydrogen electrode, RHE) and a Tafel slope of 83 mV dec−1. The Co2Fe1 LDH was further loaded onto a Ni foam (NF) substrate to form a 3D porous architecture electrode, offering a long‐term current density of 100 mA cm−2 at 1.65 V (vs. RHE) towards the OER.

Rice-like NiCuOx nanoparticles, fabricated via a one-step method, exhibit enhanced electrocatalytic activity and stability towards the OER.

A spinel NiFe2O4 dominated mixed oxide prepared from Ni hexacyanometallate (NiHCF) was found to be effective for the oxygen evolution reaction (OER) in alkaline solution.

Nanostructured nickel-cobalt binary oxides (hydroxides) with efficient water oxidation activity are favorable for water electrolysis. Herein, we successfully developed a simple and fast anodic electrodeposition route to fabricate amorphous NiCoOx films on indium tin oxide (ITO) substrate. The crystalline structure, surface morphology, and surface composition of deposited films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS), respectively. The optimized NiCoOx provided a synergistic effect for efficient water oxidation, with an overpotential of 250 mV and a low Tafel slope of 48 mV · dec-1. The NiCoOx films also exhibited an enhanced long-term durability.