Synergy of oxygen vacancies and Bi nanoparticles on BiOBr nanosheets for enhanced photocatalytic H 2 O 2 production

• Published in: New journal of chemistry 2024-01, Vol.48 (5), p.1998-2007
• Main Authors: Feng, Li, Fu, Hanping, Zhang, Tianxiang, Zhang, Qing, Ren, Shufen, Cheng, Jiayun, Liang, Qingshuang, Xiao, Xiufeng
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/D3NJ03815G

The surface properties of a photocatalyst play a pivotal role in maximizing the H 2 O 2 generation efficiency of the photocatalyst system, especially in spurring the surface catalytic reactions and inhibiting the decomposition of H 2 O 2 . Herein, a series of Bi/BiOBr-X (X = 1, 2, and 3) photocatalysts co-modified with metal Bi and oxygen vacancies were obtained by a one-step solvothermal method using mannitol as a solvent and a reducing agent. Both Bi modification and the introduction of OVs have important influence on extending the light absorption range, enhancing charge carrier separation and suppressing the recombination of charge carriers as confirmed by UV-vis DRS, EIS, and PL characterization. Besides, the introduction of OVs can lead to an upward shift of CB minimum, which results in a stronger reduction ability of the photogenerated electrons, facilitating the reaction of the photogenerated electrons with molecular oxygen to produce superoxide ions. Meanwhile, the deposition of Bi nanoparticles on the surface of BiOBr nanosheets can significantly inhibit the decomposition of H 2 O 2 . Benefiting from the synergetic effect of Bi modification and the introduction of OVs, the as-prepared photocatalysts showed enhanced H 2 O 2 production activity as high as 100.9 mM h −1 g −1 . The present work not only marks a significant advancement in photocatalytic H 2 O 2 production technology, but also provides a feasible idea and strategy for photocatalytic production of clean and renewable energy.