Title

Br doped porous bismuth oxychloride micro-sheets with rich oxygen vacancies and dominating {0 0 1} facets for enhanced nitrogen photo-fixation performances

RIS ID

138293

Publication Details

Wu, D., Wang, R., Yang, C., An, Y., Lu, H., Wang, H., Cao, K., Gao, Z., Zhang, W., Xu, F. & Jiang, K. (2019). Br doped porous bismuth oxychloride micro-sheets with rich oxygen vacancies and dominating {0 0 1} facets for enhanced nitrogen photo-fixation performances. Journal of Colloid and Interface Science, 556 111-119.

Abstract

Bismuth oxychloride micro-sheets with rich oxygen vacancies (BiOCl-OV) are firstly prepared through a surfactant assisted solvothermal method. Due to the selective surfactant adsorption, the as-prepared BiOCl-OV exposes high percentage {0 0 1} facets. Moreover, the ion-exchange process not only introduces Br atoms but also creates cavities in crystal structure of the Br doped BiOCl-OV (Br-BiOCl-OV). When used as photocatalyst for N2 photo-fixation, the optimized Br-BiOCl-OV demonstrates an ammonia producing rate of 6.3 μmol h−1 under visible light irradiation, which is greatly enhanced than that of pristine BiOCl-OV (4.1 μmol h−1). The density functional theory (DFT) calculation suggests that because of the introduced Br atoms and the oxygen vacancies, the adsorbed N2 on Br-BiOCl-OV exhibits greater N[sbnd]N bond length than that adsorbed on pristine BiOCl-OV, attributing to the effective activation of the inert N[sbnd]N bonds. Photocurrent response, state/transient PL spectra and electrochemical impedance spectroscopy indicate that the Br-BiOCl-OV possesses promoted charge separation and suppressed charge recombination, which finally leads to the high N2 photo-fixation performances.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jcis.2019.08.048