Abstract
Defected-mediated photocatalytic systems show great potential in photocatalytic N2 reduction for ammonia synthesis. In this work, 1D/2D Bi2O3/oxygen vacancies mediated Bi2MoO6 p-n junctions were constructed by decorating Bi2MoO6 nanosheets onto the surface of Bi2O3 nanorods for ammonia photosynthesis. The crystal structure, morphology, optical properties, and charge transportation behavior were systematically investigated. Taking advantage of the synergistic effect of the existence of oxygen vacancies, enlarged specific surface areas, and improved charge separation, the constructed Bi2O3/Bi2MoO6 p-n junctions exhibited superior photocatalytic N2 reduction performance. The ammonia generation rate of the synthesized BBM3 was found to be significantly higher, with values 4.12 and 2.81 times greater than those observed for pure Bi2O3 and Bi2MoO6. The pathway for the transfer of charges across the p-n junction has been proposed through the analysis of band edge position measurements and in-situ XPS. This work offers novel perspectives on the development of Bi-based photocatalytic systems for ammonia photosynthesis.
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