Enhanced visible light catalytic activity of MoS2/TiO2/Ti photocathode by hybrid-junction

Chaoqun Cheng, Guohua Liu, Kang Du, Gang Li, Wendong Zhang, Simone Sanna, Yunzhong Chen, Nini Pryds, Kaiying Wang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In photoelectrochemical (PEC) water splitting systems, crucial obstacles limiting their performance are poor charge carrier dynamics and high recombination rate of photoexcited electron hole pairs. Here, we report that this issue can be alleviated by engineering a hybrid-junction that is composed of homo- and hetero- junctions. This strategy is performed by facile hand-spraying MoS2 over the surface of a anatase/rutile homo-junction TiO2 film on the Ti substrate to further form a hybrid-junction photocathode. By applying this photocathode into PEC reactor, enhanced catalytic activity is achieved under visible light (AM1.5 illumination of 300 W/m2) with hydrogen evolution reaction (HER) potential of −114 mV versus reversible hydrogen electrode (RHE) at 10 mA/cm2 and long-term stability of more than 10 times improvement comparing to ordinary electrode without the introduciton of hybrid-junction. The hybrid-junction that effectively regulates charge separation and transfer pathways is proven to be responsible for the enhanced activity. As an novel exploration, this hybrid-junction system comprising of low-cost, efficient charge separation and transfer, and visible light responsivity offers a new path for relative materials to boost their PEC performance.
Original languageEnglish
JournalApplied Catalysis B: Environmental
Volume237
Pages (from-to)416-423
Number of pages8
ISSN0926-3373
DOIs
Publication statusPublished - 2018

Keywords

  • Hybrid-junction
  • Water splitting
  • Titanium dioxide
  • Z-scheme
  • Molybdenum Disulfide

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