Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (3): 421-430.DOI: 10.1016/S1872-2067(18)63027-X

• Articles • Previous Articles     Next Articles

La and Cr Co-doped SrTiO3 as an H2 evolution photocatalyst for construction of a Z-scheme overall water splitting system

Yushuai Jiaa,b, Dan Zhaoa, Mingrun Lia, Hongxian Hana, Can Lia   

  1. a State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, Jiangxi, China
  • Received:2017-12-23 Revised:2018-01-19 Online:2018-03-18 Published:2018-03-10
  • Contact: 10.1016/S1872-2067(18)63027-X
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21763013, 21473189), and the National Key Research and Development Program of China (2017YFA0204804).

Abstract:

The photocatalytic activity of a semiconductor-based photocatalyst largely depends on the semiconductor's intrinsic crystal and electronic properties. We have prepared two types of La and Cr co-doped SrTiO3 photocatalysts (SrTiO3(La,Cr)) using the polymerized complex method (PCM) and sol-gel hydrothermal method (SHM). Under λ > 420-nm visible light irradiation, only the Pt-loaded SrTiO3(La,Cr) prepared by the SHM showed efficient photocatalytic activities for both H2 evolution in the presence of an I- sacrificial reagent and for Z-scheme overall water splitting when it was coupled with the Pt-loaded WO3in the presence of I- and IO3- as the shuttle redox mediator. The superior photocatalytic activity of SrTiO3(La,Cr) prepared by the SHM has been ascribed to its more negative conduction-band position, higher carrier concentration, and higher carrier mobility, demonstrating that the design and synthesis of an H2-evolution photocatalyst with appropriate electronic properties is crucial for achieving Z-scheme overall water splitting.

Key words: Strontium titanate, Photocatalysis, Water splitting, Z-scheme, Hydrogen evolution