文献类型：期刊文献

英文题名：Enhancement effect of oxygen vacancy on photocatalytic CO2 reduction

作者：Yang, Qiang[1] Wang, Yunyi[4] Tian, Qingwen[1,3] Li, Xiang[1] Pan, Aixiang[1] Zhao, Mengke[1] Zhu, Yawei[1] Wu, Ting[1] Fang, Guigan[1,2]

第一作者：Yang, Qiang

机构：[1] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material Jiangsu Province, Co-Innovation Center of Efficient Processing and Utilization of Forest Resource Jiangsu Province, Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing, 210042, China; [2] Nanjing Forestry University, Nanjing, 210037, China; [3] Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, China; [4] Heilongjiang Provincial Key University Laboratory of Processing Agricultural Products, College of Food and Bioengineering, Qiqihar University, Qiqihar, 161006, China

年份：2024

卷号：12

期号：12

起止页码：7207-7214

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20240915658476);Scopus(收录号：2-s2.0-85186211692)

语种：英文

外文关键词：Bismuth compounds - Carbon dioxide - Catalysts - Coordination reactions - Energy gap - Ethylene - Ethylene glycol - Hot electrons - Reducing agents - Surface plasmon resonance

摘要：BiOBr was manufactured with various concentrations of oxygen vacancies via a solvothermal method using various alcohols as reducing agents. The reductive alcohol resulted in the fracture of the Bi-O bond, thus producing oxygen vacancies. The less polar solvent and extension of the hydroxyl carbon chain of the alcohol facilitate the generation of oxygen vacancies. Theoretical calculations and experiments demonstrated that oxygen vacancies could act as trapping sites to improve the separation efficiency of photogenerated carriers, accompanied by a decrease in the band gap energy to increase the absorption capacity for visible light. The enriched electrons in the defect band could generate more "hot electrons" that were transported to CO2 molecules adsorbed onto unsaturated coordination centers, lowering the reaction barrier and promoting the activation of CO2via the surface plasmon resonance effect. The resulting catalyst prepared with ethylene glycol exhibited a remarkable CO yield of 122.38 μmol g?1 h?1, which is nearly 7.2 times over that of the catalyst prepared with pure water. The enhanced photocatalytic performance corresponded to changes in oxygen vacancy concentration. Therefore, the change in the band gap structure arising from the variation in the content of oxygen vacancies is the cause of enhanced photocatalytic CO2 reduction. ? 2024 The Royal Society of Chemistry.