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

Yuanyuan Zhang ¹Li Guo ¹Yingxian Wang ¹Tianyu Wang ²Taoxia Ma ¹Zhuangzhuang Zhang ¹Danjun Wang ¹Bin Xu ³Feng Fu¹

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作者信息

1. Shaanxi Key Laboratory of Chemical Reaction Engineering,College of Chemistry&Chemical Engineering,Yan'an University,Yan'an 716000,China
2. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry,College of Chemistry&Materials Science,Northwest University,Xi'an 710127,China
3. Shaanxi Key Laboratory of Chemical Reaction Engineering,College of Chemistry&Chemical Engineering,Yan'an University,Yan'an 716000,China;State Key Laboratory of Organic-Inorganic Composites,Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing 100029,China
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Abstract

Photocatalytic ammonia generation via nitrogen reduction reaction(NRR)is a green and prospective ni-trogen fixation technique.However,NRR is often hampered by the high N2 adsorption/activation ener-gies 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.Fur-thermore,the as-fabricated Bi2S3/Bi2MoO6 heterojunction exhibited good selectivity,high stability and reproducibility.The excellent photocatalytic NRR performance was ascribed to the Bi2S3/Bi2MoO6 hetero-junction 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.Simultane-ously,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(oxida-tion),respectively,thus strengthening both OER and NRR half-reactions.This simple in-situ anion ex-change method offers a novel technique for strengthening OER and NRR half-reactions in Bi-based pho-tocatalysts for effective photocatalytic ammonia generation.

Key words

Anion exchange method/Bi2S3/Bi2MoO6 s-scheme heterojunction/Nitrogen activation/Photocatalytic ammonia generation

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基金项目

国家自然科学基金(22168040)

国家自然科学基金(21666039)

国家自然科学基金(21663030)

Open Project of State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory()

Beijing University of Chemical Technology Beijing(oic-201901009)

Project of Science&Technology Office of Shaanxi Province(2018TSCXL-NY-02-01)

Project of Science&Technology Office of Shaanxi Province(2020JQ-791)

Project of Yan'an Science and Technology Bureau(2018KG-04)

Graduate Innovation Project of Yan'an Uni-versity(YCX2020005)

Open Project of Chongqing Key Laboratory of Inorganic Special Functional Materials,Yangtze Nor-mal University(KFKT202001)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量76

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