Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (2): 255-264.DOI: 10.1016/S1872-2067(20)63784-6

• Article • Previous Articles     Next Articles

Organic amine surface modified one-dimensional CdSe0.8S0.2-diethylenetriamine/two-dimensional SnNb2O6 S-scheme heterojunction with promoted visible-light-driven photocatalytic CO2 reduction

Hui Yang, Jin feng Zhang#(), Kai Dai*()   

  1. Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, Anhui, China
  • Received:2021-01-20 Accepted:2021-01-20 Online:2022-02-18 Published:2021-02-22
  • Contact: Jin feng Zhang, Kai Dai
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51572103);This work was supported by the National Natural Science Foundation of China(51973078);the Distinguished Young Scholar of Anhui Province(1808085J14);the Major projects of Education Department of Anhui Province(KJ2020ZD005);Anhui Provincial Teaching Team(2019jxtd062);the Key Foundation of Educational Commission of Anhui Province(KJ2019A0595)

Abstract:

Achieving a strong redox ability and high visible-light absorption ability in a single semiconductor material is difficult. Designing a heterojunction between two semiconductor materials is a feasible method. The new step (S-scheme) heterojunction can effectively promote the separation and transfer of photogenerated electron-hole pairs and retain strong redox ability. We designed and prepared a CdSe0.8S0.2-diethylenetriamine (DETA)/SnNb2O6 heterostructure material via the solvothermal method. When CdSe0.8S0.2-DETA and SnNb2O6 form an S-scheme heterojunction, 30%CdSe0.8S0.2-DETA/SnNb2O6 exhibits the highest CO production rate (17.31 μmol·g -1·h -1), which is factors of 2.8 and 4.8 higher than that of traditional solvothermal SnNb2O6 (6.2 μmol·g -1·h -1) and CdSe0.8S0.2-DETA (3.6 μmol·g -1·h -1), respectively. X-ray photoelectron spectroscopy characterization data provided evidence that the transfer pathway of space charge in the CO2 reduction process was in accordance with the S-scheme. This research provides a simple strategy through which one can optimize the band structure to promote the separation of photogenerated carriers and achieve a high efficiency of CO2 reduction.

Key words: Photocatalysis, CdSexS1-x-DETA, SnNb2O6, Step-scheme, CO2 reduction