Oxygen vacancy and Van der Waals heterojunction modulated interfacial chemical bond over Mo2C/Bi4O5Br2 for boosting photocatalytic CO2 reduction

被引:65
作者
Peng, Haiyan [1 ]
Deng, Xiaoxu [2 ]
Li, Gen [1 ]
Wang, Qiuchen [1 ]
Song, Meiyang [1 ]
Chen, Peng [1 ]
Yin, Shuang-Feng [3 ]
机构
[1] Guizhou Univ, Sch Chem & Chem Engn, Prov Guizhou Key Lab Green Chem & Clean Energy Tec, Guiyang 550025, Guizhou, Peoples R China
[2] Guizhou Univ, Coll Big Data & Informat Engn, Guiyang 550025, Guizhou, Peoples R China
[3] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Prov Hunan Key Lab Cost Effect Utilizat Fossil Fue, Changsha 410082, Hunan, Peoples R China
来源
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2022年 / 318卷
关键词
Photocatalysis; Heterojunctions; Oxygen vacancy; Van der Waals; CO (2 )reduction; BI-RICH BI4O5BR2; DOUBLE-SHELL; QUANTUM-DOT; HETEROSTRUCTURE; OXIDATION; PERFORMANCE; CONVERSION; NANOSHEETS; GRAPHENE; REMOVAL;
D O I
10.1016/j.apcatb.2022.121866
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The establishment of heterojunctions between phase interfaces is an important strategy to enhance catalytic activity, but the behavior of charge transfer and exciton dissociation is unsharpness and significant. Here, a Van der Waals heterojunction (VDWH) of Mo2C/Bi4O5Br2 composite with oxygen vacancies (BM) was synthesized via a facile method. Various experimental results and density functional theory calculations demonstrated that the compact VDWH and unsaturated oxygen vacancy induced interfacial Mo-O bonds to modulate surface electronic structure. Consequently, the electron extracted from the exciton formed a strong internal electric field, which boosted the dissociation of the excitons and charge transfer via the electron transfer channel of the Mo-O bond. Therefore, the BM shows excellent CO2 reduction performance (1277.4 mu mol g(-1) h(-1)) and stability without using sacrificial agents and cocatalysts, which is about 6 times of Mo2C/Bi4O5Br2. This work not only gives deep in-sights into charge separation in VWDH and oxygen vacancy but also provides an efficient photocatalyst for efficient green energy conversion.
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页数:9
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