Cocatalyst engineering of a narrow bandgap Ga-La5Ti2Cu0.9Ag0.1O7S5photocatalyst towards effectively enhanced water splitting

Qi Xiao, Jiadong Xiao, Junie Jhon M. Vequizo, Takashi Hisatomi, Mamiko Nakabayashi, Shanshan Chen, Zhenhua Pan, Lihua Lin, Naoya Shibata, Akira Yamakata, Tsuyoshi Takata, Kazunari Domen

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Ga-La5Ti2Cu0.9Ag0.1O7S5(Ga-LTCA), an oxysulfide photocatalyst, can act as a hydrogen evolution photocatalyst in Z-scheme water splitting systems in conjunction with an oxygen evolution photocatalyst (OEP) under visible light irradiation up to 700 nm. However, the overall efficiency is strongly limited by the low activity of Ga-LTCA. The present work demonstrates a drastic improvement in the H2evolution activity of Ga-LTCA after loading small Rh cocatalyst particles exhibiting uniform dispersion and intimate contact with the photocatalyst. Using this system, an apparent quantum yield (AQY) of 11.2 ± 0.9% at 420 nm was obtained for H2evolution from an aqueous Na2S-Na2SO3solution, this being the highest value yet reported for a sacrificial H2evolution reaction using an oxysulfide photocatalyst. Following modification with a Cr2O3layer, efficient Z-scheme water splitting was also accomplished using the cocatalyst-loaded Ga-LTCA in combination with H+/Cs+/PtOx/WO3as the OEP, with an improved AQY of 2.4% at 420 nm.

Original languageEnglish
Pages (from-to)27485-27492
Number of pages8
JournalJournal of Materials Chemistry A
Volume9
Issue number48
DOIs
Publication statusPublished - Dec 28 2021
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Cocatalyst engineering of a narrow bandgap Ga-La5Ti2Cu0.9Ag0.1O7S5photocatalyst towards effectively enhanced water splitting'. Together they form a unique fingerprint.

Cite this