Study on oxygen evolution reaction performance of nickel-iron bi-metallic oxide catalysts constructed by in-situ growth of Prussian blue analogs on nickel foam
Developing high-performance,low-cost catalysts for the oxygen evolution reaction(OER)is of paramount importance for reducing energy consumption and enhancing economic viability in hydrogen production through water electrolysis.Using conductive nickel foam as a substrate,a series of nickel-iron bi-metallic oxide catalysts were prepared by in-situ growth of nickel-iron Prussian blue analogs through an ice-water bath method,followed by oxidation.The catalysts were characterized for its phase composition,microstructure,and surface chemical states using X-ray diffraction,scanning electron microscopy,high resolution transmission electron microscope and X-ray photoelectron spectroscop.The catalytic performances of the catalysts for OER were investigated through electrochemical tests.The results show that when oxidized at a temperature of 200℃for 2 h,nickel-iron bi-metallic oxide is highly dispersed on the nickel foam substrate of the prepared catalyst.The nanoparticles are the smallest,with an average particle size of 71 nm,providing numerous exposed catalytic active sites,thus demonstrating optimal OER electrocatalytic performance.In 1.0 mol/L KOH electrolyte,the catalyst achieves a low overpotential of only 272 mV at a current density of 10 mA/cm² and exhibites excellent electrochemical stability,maintaining stable operation for 40 h at a current density of 100 mA/cm².
Prussian blue analogsnickel-iron bi-metallic oxide catalystsoxygen evolution reactionalkaline water electrolysis
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