Regulating Phase Junction and Oxygen Vacancies of TiO2 Nanoarrays for Boosted Photoelectrochemical Water Oxidation

doi:10.1007/s40242-022-2076-z

Abstract

Abstract: In this study, we have provided a facile solution to synthesize well-aligned titanium dioxide nanorods by using hydrothermal reaction. By calcining the materials under different atmospheres and temperatures, a batch of titanium dioxides with excellent oxygen evolution reaction(OER) catalytic efficiency were obtained. This new structured TiO₂ photoanode material yields a high photocurrent density of 5.69 mA/cm² at 1.23 V vs. reversible hydrogen electrode(RHE) under simulated solar light(100 mW/cm²). Surface photovoltage techniques and other measurements were carried out to confirm that the enhanced photoelectrochemical performances were attributed to the synergistic effect of the phase junction and a certain content of surface states, which accelerate the separation and transmission of the photogenerated charges. This material with phase junction and surface states promises a potential application in the field of photoelectric catalysis under solar light.

Key words: Phase junction, Surface state, TiO₂, Photoelectro- chemical water splitting

ZHANG Xinyu, TANG Pengpeng, ZHAI Guangyao, LIN Xiu, ZHANG Qiang, CHEN Jiesheng, WEI Xiao. Regulating Phase Junction and Oxygen Vacancies of TiO₂ Nanoarrays for Boosted Photoelectrochemical Water Oxidation[J]. Chemical Research in Chinese Universities, 2022, 38(5): 1292-1300.

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Regulating Phase Junction and Oxygen Vacancies of TiO₂ Nanoarrays for Boosted Photoelectrochemical Water Oxidation

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