Expediting photocarrier separation in Ta3N5@CaTaO2N heterostructures with seamless interfaces for photocatalytic water oxidation under visible light

Yuwei Zhang, Lulu Kong, Elena Yu Konysheva, Xiaoxiang Xu

Research output: Journal PublicationArticlepeer-review

Abstract

The separation of photocarriers (e- and h+) is of critical importance in initiating efficient catalytic reactions over semiconductor-based photocatalysts. Although heterostructures have been frequently built to separate photocarriers, the lack of proper heterogeneous interfaces greatly limits their efficacies. Here, we show that excellent heterogeneous interfaces can be built for in situ fabricated Ta3N5 @CaTaO2N heterostructures. These interfaces are characterized by perfectly matching (020) crystal facets of Ta3N5 and CaTaO2N, offering ideal channels for charge transportation. As revealed by both experimental and theoretical analysis, these seamless interfaces enable rapid spatial photocarrier separation, which in turn, contribute to exceptional photocatalytic activity. Under optimal conditions, Ta3N5 @CaTaO2N heterostructures achieve apparent quantum efficiency as high as 14.52% at 420 ± 20 nm for O2-evolution, substantially surpassing Ta3N5, CaTaO2N, and their mixtures. These results not only justify the importance of heterogeneous interfaces for photocarrier separation but also invigorate more attention upon heterostructures towards efficient solar water splitting.

Original languageEnglish
Article number121712
JournalApplied Catalysis B: Environmental
Volume317
DOIs
Publication statusPublished - 15 Nov 2022

Keywords

  • CaTaON
  • Heterostructures
  • Photocatalyst
  • TaN
  • Water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science (all)
  • Process Chemistry and Technology

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