Overturning photoreduction product of CO2 by defect- and COOH-functionalized multi-wall carbon nanotubes

被引:36
|
作者
Liu, Peng [1 ]
Niu, Lin [2 ,3 ]
Men, Yu-Long [1 ]
Peng, Chong [1 ]
Liu, Zheng [1 ,2 ]
Meng, Xin-Yu [3 ]
Pan, Yun-Xiang [1 ,3 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Elect Informat & Elect Engn, Shanghai 200240, Peoples R China
[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore
[3] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Dept Chem Engn, Shanghai 200240, Peoples R China
来源
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 320卷
基金
中国国家自然科学基金;
关键词
Carbon dioxide; Photoreduction; Methanol; Carbon nanotube; Functional group; QUANTUM DOTS; EFFICIENT; NANOCRYSTALS; REDUCTION; NANOSHEETS; OXIDATION; CATALYST; GROWTH; ZINC;
D O I
10.1016/j.apcatb.2022.121985
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
We functionalize MWCNTs with defects and COOH groups to form MWCNTs30 through a novel discharge process. In the photoreduction of CO2 with pure H2O in the absence of sacrificial reagent, with CdS as light absorber, MWCNTs30 triggers a selective CH3OH production, with a CH3OH selectivity of 100% and an internal quantum efficiency of 3.9%, but CO is the only C-based product by using pristine MWCNTs without function-alization. The defects on MWCNTs30 are active sites for enhancing CO2 adsorption, H2O dissociation to produce H and H transfer to CO2, thus boosting CO2 hydrogenation to CH3OH. The COOH groups on MWCNTs30 provide H for promoting CO2 hydrogenation to CH3OH. The multiple roles of defects and COOH groups overturn the photoreduction product from CO to CH3OH. The results open a new way to achieve more efficient photore-duction of CO2 in the absence of noble metal and sacrificial reagent.
引用
收藏
页数:10
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