Transparent Co_3FeO_x Film Passivated BiVO_4 Photoanode for Efficient Photoelectrochemical Water Splitting

【Author】

FANG Ming;QIN Qi;CAI Qian;LIU Wei;Fujian Normal University;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Provincial Key Laboratory of Nanomaterial,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences;

【Institution】

Fujian Normal University;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Provincial Key Laboratory of Nanomaterial,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences;

【Abstract】

Photoelectrochemistry that use semiconductors to absorb sunlight for water splitting provides an effective method for the development of renewable hydrogen energy in the future.In this paper,a transparent and highly-efficient cobalt-iron oxide (Co_3FeO_x) nano-film was fabricated through hydrothermal method by directional adjustment of atomic ratio to promote the kinetics of BiVO_4 (BVO) photoanode water oxidation.As a result,the Co~2_3FeO_x-modified BVO photoanode (Co_3FeO_x/BVO) exhibits an impressive photocurrent density of 4.0 mA·cmat 1.23 V versus reversible hydrogen electrode (RHE),approximately 2.17-fold higher than that of bare BVO,as well as a cathodically shifted onset potential of 320 mV.Transparent catalyst nanolayer structure is clarified by ultraviolet-visible spectroscopy.In addition,the Co_3FeO_x/BVO photoanode has better stability,and there is no obvious activity degradation after 10 hours of reaction.This strategy provides a broad prospect for the use of water oxidation co-catalyst to achieve effective water splitting.

【Keywords】

photoelectrochemical water splitting;;bismuth vanadate;;co-catalyst;;cobalt-iron oxide

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Total: 38 articles

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