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- W3118861601 abstract "• Electron-trapped oxygen vacancy was introduced in Ti/TiO 2 -001 by H 2 reduction. • Increasing electron-trapped oxygen vacancy in Ti/TiO 2 -001 enhanced its reduction activity. • The synergistic role between electron-trapped oxygen vacancy and [001] facets was proposed. • Electron-trapped oxygen vacancy on TiO 2 acted as adsorption site and reactivity sites. Despite the fact that electron-trapped oxygen vacancy and [0 0 1] facets fundamentally affect the reactivity of TiO 2 , their synergistic role in the electrochemical activity of TiO 2 toward p-nitrophenol (p-NP) reduction is still unknown. In this study, defective and [0 0 1] facets engineered TiO 2 cathode, i.e. Ti/TiO 2−x -0 0 1, was prepared for p-NP reduction. In comparison to defective Ti/TiO 2 cathode with [1 0 1] facets (Ti/TiO 2−x -1 0 1), the combination of the electron-trapped oxygen vacancy and [0 0 1] facets exhibited a synergistic effect to improve the electrochemical reduction efficiency of TiO 2 . Density functional theory calculations verified that the introduction of [0 0 1] facets and electron-trapped oxygen vacancy on TiO 2 was beneficial to facilitate electron transfer and improve the indirect reduction efficiency for p-NP electrochemical reduction. Moreover, the electron-trapped oxygen vacancy extent of Ti/TiO 2−x -0 0 1 was modulated by adjusting reduction temperature (250–650 °C). The maximum electron-trapped oxygen vacancy amount of Ti/TiO 2−x -0 0 1 was attained at the reduction temperature of 350 °C, which resulted in the highest p-NP reduction efficiency of 99.3%, accompanying the p-AP selectivity of 89.5%. In this case, the abundant active and adsorption sites were provided on the surface of Ti/TiO 2−x -0 0 1 prepared at 350 °C, in which p-NP adsorption coefficient and electrochemical surface area increased to 1.01 L mg −1 and 25 cm 2 , respectively. Generally, this work provides a paradigm for the design of efficient non-metallic catalyst for nitroaromatic chemicals reduction." @default.
- W3118861601 created "2021-01-18" @default.
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- W3118861601 date "2021-05-01" @default.
- W3118861601 modified "2023-10-18" @default.
- W3118861601 title "Synergistic role of electron-trapped oxygen vacancy and exposed TiO2 [0 0 1] facets toward electrochemical p-nitrophenol reduction: Characterization, performance and mechanism" @default.
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- W3118861601 doi "https://doi.org/10.1016/j.cej.2021.128485" @default.
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