An S-scheme heterojunction of single Ni sites decorated ultrathin carbon nitride and Bi2WO6 for highly efficient photothermal CO2 conversion to syngas

被引:11
作者
Wu, Jiaming [1 ]
Li, Keyan [1 ]
An, Sufeng [1 ,2 ]
Yan, Siyang [1 ]
Liu, Jiaxu [1 ]
Song, Chunshan [1 ,3 ]
Guo, Xinwen [1 ]
机构
[1] Dalian Univ Technol, Frontiers Sci Ctr Smart Mat, PSU DUT Joint Ctr Energy Res, Sch Chem Engn,State Key Lab Fine Chem, Dalian 116024, Peoples R China
[2] SINOPEC Dalian Res Inst Petr & Petrochem Co Ltd, Dalian 116045, Peoples R China
[3] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong 999077, Peoples R China
来源
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2024年 / 347卷
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
CO2; reduction; Photothermal catalysis; Heterojunction; Ultrathin carbon nitride; Syngas; PHOTOCATALYTIC PERFORMANCE; ACTIVE-SITES; METAL; REDUCTION; CATALYSIS;
D O I
10.1016/j.apcatb.2024.123822
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
Solar-driven conversion of CO2 and H2O to value-added chemicals or fuels is an ideal strategy to tackle the energy crisis and environmental issues. However, construction of highly efficient photosynthesis systems remains a challenge. This work reports a heterojunction catalyst consisting of ultrathin carbon nitride with single Ni sites and Bi2WO6 for photothermal conversion of CO2 and H2O to syngas. The catalyst exhibits exceptional activity at medium temperature of 250 degrees C, with CO and H-2 production rates of 4493 and 9191 mu mol g(-1) h(-1), respectively. Experimental results and DFT calculations reveal that the construction of S-scheme heterojunction and the introduction of single Ni sites greatly improve the separation of photogenerated carriers as well as the adsorption and activation of CO2. Meanwhile, it is proved that light drives the generation of H+ and activates the CO2 molecules, while heat accelerates the generation and diffusion of H+. The photothermal synergistic effect promotes the catalyst activity by two orders of magnitude.
引用
收藏
页数:10
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