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Bismuth-rich bismuth oxyiodide microspheres with abundant oxygen vacancies as an efficient photocatalyst for nitrogen fixation

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Abstract

Solar-driven reduction of dinitrogen (N2) to ammonia (NH3) is still challenging due to the highly stable N–N triple bond. Herein, orthorhombic phase H-Bi5O7I microspheres with abundant oxygen vacancies (OVs) were successfully prepared via a simple calcination and hydrogen reduction strategy. Based on the combined bismuth-rich strategy and the introduction of OVs in H-Bi5O7I, a remarkable photocatalytic nitrogen fixation performance was achieved under visible light irradiation in the absence of any organic scavengers or noble-metal cocatalysts. H-Bi5O7I exhibits an NH4+ generation rate of 162.48 μmol g−1 h−1, which is 2.0 and 7.4 times higher than that of Bi5O7I and BiOI. It is because H-Bi5O7I with abundant OVs has a more proper band gap, better electron capturing ability and more effective separation and transfer rate for the photogenerated charge carriers. This study may provide a new direction and useful insight for the design of defect assisted N2 fixation photocatalysts.

Graphical abstract: Bismuth-rich bismuth oxyiodide microspheres with abundant oxygen vacancies as an efficient photocatalyst for nitrogen fixation

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Supplementary files

Article information


Submitted
11 Apr 2020
Accepted
15 Jun 2020
First published
15 Jun 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Bismuth-rich bismuth oxyiodide microspheres with abundant oxygen vacancies as an efficient photocatalyst for nitrogen fixation

M. Lan, N. Zheng, X. Dong, C. Hua, H. Ma and X. Zhang, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01332C

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