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Start Over Author "Wang, Yingxian" Topic ammonia
2 results on '"Wang, Yingxian"'

1. In-situ anion exchange based Bi2S3/OV-Bi2MoO6 heterostructure for efficient ammonia production: A synchronized approach to strengthen NRR and OER reactions

Author

Feng Fu, Taoxia Ma, Yuanyuan Zhang, Tianyu Wang, Bin Xu, Wang Yingxian, Zhuangzhuang Zhang, Li Guo, and Danjun Wang

Subjects
Materials science, Polymers and Plastics, Ion exchange, Mechanical Engineering, Metals and Alloys, Oxygen evolution, Heterojunction, Photochemistry, Redox, Ammonia production, Ammonia, chemistry.chemical_compound, Adsorption, chemistry, Mechanics of Materials, Materials Chemistry, Ceramics and Composites, Photocatalysis
Abstract

Photocatalytic ammonia generation via nitrogen reduction reaction (NRR) is a green and prospective nitrogen fixation technique. However, NRR is often hampered by the high N2 adsorption/activation energies and is accompanied by a slow kinetics oxygen evolution reaction (OER). Herein, a robust Bi2S3/OV-Bi2MoO6 S-scheme heterojunction is constructed using a simple in-situ anion exchange process, which enables oxygen vacancy (OVs) abundant Bi2MoO6 microspheres with surface deposited Bi2S3. The as-fabricated Bi2S3/OV-Bi2MoO6 functioned as an effective photocatalyst to convert N2-to-NH3 under mild conditions. The photocatalytic NH3/NH4+ production rate reached 126 μmol gcat−1 under visible light for 2.5 h with 2% of Bi2S3/OV-Bi2MoO6 photocatalyst, which was 8-fold higher than pristine Bi2MoO6. Furthermore, the as-fabricated Bi2S3/Bi2MoO6 heterojunction exhibited good selectivity, high stability and reproducibility. The excellent photocatalytic NRR performance was ascribed to the Bi2S3/Bi2MoO6 heterojunction formed subsequent to the strong interaction between Bi2S3 and Bi2MoO6. The OVs facilitated the chemical adsorption process allowing activation of N2 molecule on the Bi2S3/Bi2MoO6. Simultaneously, the S-scheme heterojunction prolonged the lifetime of photogenerated carriers, accelerated the electrons/holes spatial separation and accumulation on the Bi2S3 (reduction) and Bi2MoO6 side (oxidation), respectively, thus strengthening both OER and NRR half-reactions. This simple in-situ anion exchange method offers a novel technique for strengthening OER and NRR half-reactions in Bi-based photocatalysts for effective photocatalytic ammonia generation.

Published
2022

2. In-situ anion exchange based Bi2S3/OV-Bi2MoO6 heterostructure for efficient ammonia production: A synchronized approach to strengthen NRR and OER reactions.

Author

Zhang, Yuanyuan, Guo, Li, Wang, Yingxian, Wang, Tianyu, Ma, Taoxia, Zhang, Zhuangzhuang, Wang, Danjun, Xu, Bin, and Fu, Feng

Subjects
BISMUTH oxides, CHEMICAL processes, AMMONIA, OXYGEN evolution reactions, ANIONS, VISIBLE spectra, ACTIVATION energy, HETEROJUNCTIONS
Abstract

• The Bi 2 S 3 /OV-Bi 2 MoO 6 S-scheme heterojunction is constructed using a simple in-situ anion exchange process enabling oxygen vacancy (OV) abundant Bi 2 MoO 6 microspheres with surface deposited Bi 2 S 3. • The as-fabricated Bi 2 S 3 /OV-Bi 2 MoO 6 functioned as an effective photocatalyst to convert N 2 -to-NH 3 under mild conditions without any sacrificial agent. • The photocatalytic NH 3 production rate reached 126 μmol g cat −1 under visible light for 2.5 h with 2% Bi 2 S 3 /OV-Bi 2 MoO 6 photocatalyst, which was 8 fold higher than Bi 2 MoO 6. • The S-scheme heterojunction accelerated the e −/ h + pairs spatial separation and accumulation on the Bi 2 S 3 and Bi 2 MoO 6 side, respectively, thus simultaneously strengthening both OER and NRR half-reactions. Photocatalytic ammonia generation via nitrogen reduction reaction (NRR) is a green and prospective nitrogen fixation technique. However, NRR is often hampered by the high N 2 adsorption/activation energies and is accompanied by a slow kinetics oxygen evolution reaction (OER). Herein, a robust Bi 2 S 3 /OV-Bi 2 MoO 6 S-scheme heterojunction is constructed using a simple in-situ anion exchange process, which enables oxygen vacancy (OVs) abundant Bi 2 MoO 6 microspheres with surface deposited Bi 2 S 3. The as-fabricated Bi 2 S 3 /OV-Bi 2 MoO 6 functioned as an effective photocatalyst to convert N 2 -to-NH 3 under mild conditions. The photocatalytic NH 3 /NH 4 + production rate reached 126 μmol g cat −1 under visible light for 2.5 h with 2% of Bi 2 S 3 /OV-Bi 2 MoO 6 photocatalyst, which was 8-fold higher than pristine Bi 2 MoO 6. Furthermore, the as-fabricated Bi 2 S 3 /Bi 2 MoO 6 heterojunction exhibited good selectivity, high stability and reproducibility. The excellent photocatalytic NRR performance was ascribed to the Bi 2 S 3 /Bi 2 MoO 6 heterojunction formed subsequent to the strong interaction between Bi 2 S 3 and Bi 2 MoO 6. The OVs facilitated the chemical adsorption process allowing activation of N 2 molecule on the Bi 2 S 3 /Bi 2 MoO 6. Simultaneously, the S-scheme heterojunction prolonged the lifetime of photogenerated carriers, accelerated the electrons/holes spatial separation and accumulation on the Bi 2 S 3 (reduction) and Bi 2 MoO 6 side (oxidation), respectively, thus strengthening both OER and NRR half-reactions. This simple in-situ anion exchange method offers a novel technique for strengthening OER and NRR half-reactions in Bi-based photocatalysts for effective photocatalytic ammonia generation. [ABSTRACT FROM AUTHOR]

Published
2022
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