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>Development of BiOI as an effective photocatalyst for oxygen evolution reaction under simulated solar irradiation
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Development of BiOI as an effective photocatalyst for oxygen evolution reaction under simulated solar irradiation
In this study, crystalline BiOI powders were prepared for photocatalytic O-2 evolution in the presence of NaIO3 as the electron mediator. BiOI with a microspherical morphology, a layered structure composed of [Bi2O2](2+) and intercalated I- ions, exhibited a suitable valence band level to generate photoexcited holes for O-2 evolution. Moreover, ruthenium was loaded using the impregnation or photodeposition method to produce RuO2 as a co-catalyst to improve the photocatalytic activity of BiOI. Photodeposited RuO2-loaded BiOI showed a high O-2 evolution rate of 2730 mu mol h(-1) and can be reused eight times in the presence of NaIO3 under simulated solar irradiation. The high photocatalytic O-2 evolution can be attributed to the highly dispersed RuO2, which could serve as an effective electron sink, on the surface of BiOI and its enhanced visible light-harvesting ability. Besides, the presence of NaIO3 in the system was effective to receive photoexcited electrons from RuO2-loaded BiOI for improving charge separation and hence the O-2 evolution from RuO2 sites on the BiOI surface. The RuO2-loaded BiOI with high photocatalytic activity and stability for generating O-2 could be a potential candidate for achieving overall water splitting in a Z-scheme system in the presence of NaIO3 for solar utilization in the future.
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