N-doped FeNi Cocatalysts for Enhancing the OER Activity in Fe2O3 Photoanodes
Photoelectrochemical(PEC)catalysis has been perceived as a promising approach in the water splitting,utilizing the drive of sunlight to yield evironmentally and storable hydrogen energy.However,the photoanodes were restricted in sluggish water oxidation kinetics and high charge recombination,resulting in low energy conversion.Herein,we demonstrated the N-doped FeNi cocatalysts over the surface of pristine Fe2O3 photoanodes(Fe2O3-FNNO),whose photocurrent density could reach to 2.5 mA·cm-2 at 1.23 V vs.RHE(reversible hydrogen electrode,AM 1.5G).Further experimental and characterization studies reveal that the reduction properties of NH3 and formation of N―O bond could enhance the ratio of Fe2+and Ni3+in FeNi cocatalysts to offer more active sites in the PEC water splitting.Thus,this work provides a potential and promising route to developing high-performance Fe2O3 photoanodes.
solar energyFe2O3 photoanodesN-dopedFeNi cocatalystwater oxidation
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