Selective CO2 photoreduction to CH4 mediated by dimension-matched 2D/2D Bi3NbO7/g-C3N4 S-scheme heterojunction

Wang, Kai1; Feng, Xuezhen3; Shangguan, Yangzi3; Wu, Xiaoyong2; Chen, Hong3

2022-02-01

10.1016/S1872-2067(21)63819-6

CHINESE JOURNAL OF CATALYSIS   影响因子和分区

0253-9837

1872-2067

Discovering highly selective catalysts is key to achieve effective CO2 photoreduction to hydrocarbon fuels. In this work, we construct an ultrathin dimension-matched S-scheme Bi3NbO7/g-C3N4 heterostructure, which permits the highly selective photocatalytic reduction of CO2 to CH4, as shown by C-13 isotopic measurements. Density functional theory calculations combined with solid-state characterization confirm the electron transfer from g-C3N4 nanosheets to Bi3NbO7, establishing an internal electric field. The internal electric field drives photogenerated electrons from Bi3NbO7 to g-C3N4, as revealed by in-situ X-ray photoelectron spectroscopy, demonstrating the presence of an S-scheme charge transfer path in Bi3NbO7 to g-C3N4 heterostructures allowing efficient and selective CO2 photoreduction. As a result, the optimized sample achieved a CH4 evolution rate of 37.59 mu mol.g(-1).h(-1), a ca. 15-fold enhancement compared to ultrathin g-C3N4 nanosheets, and also retained stability after 10 reaction cycles and 40 h of simulated solar irradiation with no sacrificial reagents. The optimized Bi3NbO7 to g-C3N4 composites achieve almost 90% selectivity for CH4 production over CO. (C) 2022, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Dimension-matched S-scheme Photocatalysis CO2 reduction Selectivity

SCI ; EI ; CPCI-S

英语

ESI高被引

通讯

National Nature Science Foundation of China[21975193,21777045] ; Research Project of Hubei Provincial Department of Education[Q20202501]

Chemistry ; Engineering

Chemistry, Applied ; Chemistry, Physical ; Engineering, Chemical

WOS:000746696100006

SCIENCE PRESS

20220311486890

Carbon dioxide ; Charge transfer ; Chemical reactions ; Density functional theory ; Electric fields ; Heterojunctions ; Nanosheets ; Niobium compounds ; X ray photoelectron spectroscopy

Electricity: Basic Concepts and Phenomena:701.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2 ; Probability Theory:922.1 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4 ; Solid State Physics:933

CHEMISTRY

Web of Science

1.Hubei Normal Univ, Coll Urban & Environm Sci, Hubei Key Lab Pollutant Anal & Reuse Technol, Huangshi 435002, Hubei, Peoples R China
2.Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Hubei, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Wang, Kai,Feng, Xuezhen,Shangguan, Yangzi,et al. Selective CO2 photoreduction to CH4 mediated by dimension-matched 2D/2D Bi3NbO7/g-C3N4 S-scheme heterojunction[J]. CHINESE JOURNAL OF CATALYSIS,2022,43(2):246-254.

Wang, Kai,Feng, Xuezhen,Shangguan, Yangzi,Wu, Xiaoyong,&Chen, Hong.(2022).Selective CO2 photoreduction to CH4 mediated by dimension-matched 2D/2D Bi3NbO7/g-C3N4 S-scheme heterojunction.CHINESE JOURNAL OF CATALYSIS,43(2),246-254.

Wang, Kai,et al."Selective CO2 photoreduction to CH4 mediated by dimension-matched 2D/2D Bi3NbO7/g-C3N4 S-scheme heterojunction".CHINESE JOURNAL OF CATALYSIS 43.2(2022):246-254.