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Title: Synergistic effect of porosity and gradient doping in efficient solar water oxidation of catalyst-free gradient Mo:BIVO4
Authors: Antony, Rajini P.
Zhang, Mengyuan
Zhou, Kaiqi
Barber, James
Wong, Lydia Helena
Loo, Joachim Say Chye
Keywords: Engineering::Materials
Solar Water Oxidation
Issue Date: 2018
Source: Antony, R. P., Zhang, M., Zhou, K., Loo, J. S. C., Barber, J., & Wong, L. H. (2018). Synergistic effect of porosity and gradient doping in efficient solar water oxidation of catalyst-free gradient Mo:BIVO4. ACS Omega, 3(3), 2724-2734. doi:10.1021/acsomega.7b01794
Series/Report no.: ACS Omega
Abstract: In this paper, the synergistic effect of porosity and gradient of Mo doping in BiVO4 photoanodes for improving charge separation and solar water oxidation performance is reported. A simple solution-based, three-step fabrication route was adopted using a layer-by-layer assembling technique. A water oxidation photocurrent of ∼1.73 mA cm–2 at 1.23 V vs reversible hydrogen electrode in neutral pH was achieved without using any sacrificial agent or electrocatalyst. The gradient Mo doping was found to enhance charge separation efficiency, which was verified through a shift in the water oxidation onset potential cathodically to ∼200 mV. In addition, these results were further confirmed by a higher open-circuit photovoltage and flat band potential investigations. This was attributed to the surface energetics played by gradient Mo doping that served as the driving force in reducing the onset potential for water oxidation. The coupled effect of enhanced light absorption and charge separation was revealed by monitoring the difference in decoupling the water oxidation efficiencies of porous and planar Mo:BiVO4 photoanodes. This study demonstrated an improvement in the catalytic and charge separation efficiency of Mo:BiVO4 photoanodes due to the introduction of porous structured homojunctions in a gradient manner. The simple synthesis approach adopted in the present study can be utilized and scaled up in making efficient photoanodes for competent solar water oxidation cells.
DOI: 10.1021/acsomega.7b01794
Schools: School of Materials Science & Engineering 
Rights: © 2018 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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