Nano-sized quaternary CuGa2In3S8 as an efficient photocatalyst for solar hydrogen production

Tarek Kandiel, Dalaver H. Anjum, Kazuhiro Takanabe

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The synthesis of quaternary metal sulfide (QMS) nanocrystals is challenging because of the difficulty to control their stoichiometry and phase structure. Herein, quaternary CuGa2In3S8 photocatalysts with a primary particle size of ≈4nm are synthesized using a facile hot-injection method by fine-tuning the sulfur source injection temperature and aging time. Characterization of the samples reveals that quaternary CuGa2In3S8 nanocrystals exhibit n-type semiconductor characteristics with a transition band gap of ≈1.8eV. Their flatband potential is located at -0.56V versus the standard hydrogen electrode at pH6.0 and is shifted cathodically by 0.75V in solutions with pH values greater than 12.0. Under optimized conditions, the 1.0wt% Ru-loaded CuGa2In3S8 photocatalyst exhibits a photocatalytic H2 evolution response up to 700nm and an apparent quantum efficiency of (6.9±0.5)% at 560nm. These results indicate clearly that QMS nanocrystals have great potential as nano-photocatalysts for solar H2 production. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)3112-3121
Number of pages10
Issue number11
StatePublished - Sep 3 2014

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Funding for this work was provided by Saudi Aramco under contract 6600024505/01. T. A. K. would like to thank the Chemistry Department, Faculty of Science, Sohag University for granting him a leave of absence.

ASJC Scopus subject areas

  • General Energy
  • Environmental Chemistry
  • General Materials Science
  • General Chemical Engineering


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