Effective orientation control of photogenerated carrier separation via rational design of a Ti3C2(TiO2)@CdS/MoS2 photocatalytic system

Zizheng Ai, Yongliang Shao, Bin Chang, Baibiao Huang, Yongzhong Wu*, Xiaopeng Hao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

Spontaneous photocatalytic H2 evolution from solar-driven water splitting is highly attractive for converting abundant solar energy to valuable fuel. Regulation of the direction of photocarriers separation and transport is an important factor influencing solar energy conversion efficiency. Here, structural design and energy band engineering are employed to design and construct a novel Ti3C2(TiO2)@CdS/MoS2 composite photocatalyst. The transfer direction of photogenerated electrons and holes is achieved via rational conjunction of Ti3C2 and MoS2. This well designed photocatalytic system possesses remarkable H2 evolution rate (8.47 mmol h−1 g−1) and excellent photocatalytic stability. Furthermore, a high H2 yield rate of 344.74 μmol h−1 g−1 can be reached in pure water without any electron sacrificial agents. Through combination with the scope of a type II junction between CdS and MoS2, the new Z-scheme between CdS and TiO2 transformed from Ti3C2 sets up a multi-step separation of electron-hole pairs. This process prolongs the lifetime of photogenerated electrons and makes them reach the active sites to initiate an efficient photocatalytic redox reaction. This work demonstrates that the design philosophy of selectively controlling the transfer direction of electrons and holes has promising applications in solar energyutilisation.

Original languageEnglish (US)
Pages (from-to)202-208
Number of pages7
JournalApplied Catalysis B: Environmental
Volume242
DOIs
StatePublished - Mar 2019

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (Contract Nos. 51572153 , 51602177 ), the Major Basic Program of the Natural Science Foundation of Shandong Province (Contract No. ZR2017ZB0317 ) and Taishan Scholars Program of Shandong Province .

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Composite photocatalyst
  • H evolution
  • II junction
  • Multi-step separation
  • Z-scheme

ASJC Scopus subject areas

  • Catalysis
  • General Environmental Science
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Effective orientation control of photogenerated carrier separation via rational design of a Ti3C2(TiO2)@CdS/MoS2 photocatalytic system'. Together they form a unique fingerprint.

Cite this