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Gujral, Satnam Singh
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article
Solar water oxidation by multicomponent TaON photoanodes functionalized with nickel oxide
Abstract
<p>Efficient solar-powered water oxidation over the TaON-based anodes requires coupling this photoactive n-type semiconductor to an electrooxidation catalyst to improve the otherwise unsatisfactory activity and stability. Herein, we examine how functionalization with electrodeposited nickel oxide, NiO<sub>x</sub>, affects the performance of screen-printed TaON photoanodes post-necked with titania (TiO<sub>2</sub>–TaON). The effects of the NiO<sub>x</sub> photo-electrodeposition parameters on the microstructure and photocatalytic performance of the resulting anodes are explored. Enhancements in the transient water oxidation photocurrent densities by sixfold vs. unmodified TiO<sub>2</sub>–TaON were achieved with the use of the NiO<sub>x</sub>/TiO<sub>2</sub>–TaON photoanodes. Long-term stability tests reveal a slow but persistent degradation of the performance of the multicomponent photocatalysts under the severely oxidizing conditions of water photo-oxidation coincident with continuous morphological changes in the NiO<sub>x</sub> deposits.</p>