Enhanced ambient ammonia photosynthesis by Mo-doped Bi5O7Br nanosheets with light-switchable oxygen vacancies

doi:10.1016/S1872-2067(21)63837-8

Abstract

Abstract:

The fabrication of efficient catalysts to reduce nitrogen (N₂) to ammonia (NH₃) is a significant challenge for artificial N₂ fixation under mild conditions. In this work, we demonstrated that the simultaneous introduction of oxygen vacancies (OVs) and Mo dopants into Bi₅O₇Br nanosheets can significantly increase the activity for photocatalytic N₂ fixation. The 1 mol% Mo-doped Bi₅O₇Br nanosheets exhibited an optimal NH₃ generation rate of 122.9 μmol g^-1 h^-1 and durable stability, which is attributed to their optimized conduction band position, suitable absorption edge, large number of light-switchable OVs, and improved charge carrier separation. This work provides a promising approach to design photocatalysts with light-switchable OVs for N₂ reduction to NH₃ under mild conditions, highlighting the wide application scope of nanostructured BiOBr-based photocatalysts as effective N₂ fixation systems.

Key words: Photocatalyst, Mo-doped, Bi₅O₇Br nanosheets, Light-switchable oxygen vacancies, N₂ photoreduction to NH₃

Xue Chen, Ming-Yu Qi, Yue-Hua Li, Zi-Rong Tang, Yi-Jun Xu. Enhanced ambient ammonia photosynthesis by Mo-doped Bi₅O₇Br nanosheets with light-switchable oxygen vacancies[J]. Chinese Journal of Catalysis, 2021, 42(11): 2020-2026.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63837-8

https://www.cjcatal.com/EN/Y2021/V42/I11/2020

Figures/Tables 4

Fig. 1. (a) Schematic diagram of the fabrication of Mo-Bi5O7Br; (b) SEM, (c) TEM, and (d) HRTEM images of Mo-Bi5O7Br-1 nanosheets; (e) HAADF-STEM image with corresponding elemental mappings and (f) EDX spectrum of Mo-Bi5O7Br-1 nanosheets.

Fig. 2. (a) UV-vis absorption spectra and corresponding Tauc plots (inset) of the as-prepared blank Bi5O7Br and Mo-Bi5O7Br-1 nanosheets; (b) Valence band XPS profile of Mo-Bi5O7Br-1 nanosheets. The inset shows the electronic energy level diagram; XPS profiles of Mo 3d (c), Bi 4f (d), Br 3d (e), and O 1s (f) levels of blank Bi5O7Br and Mo-Bi5O7Br-1 nanosheets.

Fig. 3. (a) EPR spectra of blank Bi5O7Br and Mo-Bi5O7Br-1 nanosheets before and after irradiation at 77 K; (b) Time-dependent EPR spectra of Mo-Bi5O7Br-1 nanosheets at 77 K; (c) Photocatalytic NH3 production rate over Mo-Bi5O7Br-x samples; (d) Photocatalytic cycling tests for Mo-Bi5O7Br-1 nanosheets.

Fig. 4. (a) N2 TPD profiles of blank Bi5O7Br and Mo-Bi5O7Br-1 nanosheets; (b) Cyclic voltammetry and (c) EIS plots of blank Bi5O7Br and Mo-Bi5O7Br-1 nanosheets; (d) Steady-state PL emission spectra of blank Bi5O7Br and Mo-Bi5O7Br-1 nanosheets with an excitation wavelength of 375 nm; (e) Schematic illustration of ph

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Enhanced ambient ammonia photosynthesis by Mo-doped Bi₅O₇Br nanosheets with light-switchable oxygen vacancies

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