Role of CoOx cocatalyst on Ta3N5 photocatalysts studied by transient visible to mid-infrared absorption spectroscopy

Junie Jhon M. Vequizo, Mirabbos Hojamberdiev, Katsuya Teshima, Akira Yamakata

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Tantalum nitride (Ta3N5) photocatalysts attract considerable attention owing to their visible light absorption below 600 nm and suitable band structures for reduction and oxidation of water to generate hydrogen and oxygen gas. Herein, we investigated the effects of CoOx on the dynamics of photogenerated charge carriers in Ta3N5 powder photocatalysts by using microsecond to millisecond transient visible to mid-IR absorption spectroscopy. Transient absorption measurements revealed that most of the electrons in Ta3N5 are deeply trapped at the defects, most likely originating from oxygen vacancies and reduced Ta species. Two important roles of CoOx were elucidated: effective capture of holes to prolong electron lifetime and reduction of defects as recombination centers, which further elongates the lifetime of both electrons and holes.

Original languageEnglish
Pages (from-to)315-319
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume358
DOIs
Publication statusPublished - May 1 2018
Externally publishedYes

Keywords

  • Charge separation
  • Co-catalysts
  • Defects
  • Photocatalysts
  • Time-resolved measurements

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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