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Sang-Hyeok Yoon,Tangnuer Sadike,Jin-Rui Ding,Kyo Seon Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
We demonstrate the cobalt phosphate (Co-Pi) modified 1-D WO3/BiVO4 nanowire heterojunctionphotoanode as oxygen evolution catalyst for photoelectrochemical (PEC) water splitting application. WO3 nanowires were prepared byflame vapor deposition (FVD) process and BiVO4 nanoparticles werespin-coated on top of WO3 nanowires. In order to improve oxygen evolution kinetics, WO3/BiVO4heterojunction photoanode was modified by photo-assisted electrodeposition of Co-Pi. Co-Pi improvethe PEC water oxidation efficiency of 1 D-WO3/BiVO4 by reducing the charge recombination, facilitatingthe hole transfer and reducing the overpotential of oxygen evolution reaction. The optimum amount ofCo-Pi for high photocurrent density was proposed. The loaded Co-Pi has enhanced the overall PECperformance showing largely shifted onset potential ( 450 mV) with significantly increased photocur-rent (2.7 times at 1.23 V vs. RHE). The prepared composite photoanode of 1-D WO3/BiVO4/Co-Pi showsthe higher incident photon to current efficiency and applied bias photon-to-current efficiency thanwithout Co-Pi loading. We obtain the highest level of PEC performance with WO3/BiVO4/Co-Piheterojunction composite photoanode which is based on 1-D framework of WO3 prepared by facile, rapidand economical FVD in this study.