TY - JOUR
T1 - Nano-sized quaternary CuGa2In3S8 as an efficient photocatalyst for solar hydrogen production
AU - Kandiel, Tarek
AU - Anjum, Dalaver H.
AU - Takanabe, Kazuhiro
N1 - 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.
PY - 2014/9/3
Y1 - 2014/9/3
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/563750
UR - http://doi.wiley.com/10.1002/cssc.201402525
UR - http://www.scopus.com/inward/record.url?scp=84918537263&partnerID=8YFLogxK
U2 - 10.1002/cssc.201402525
DO - 10.1002/cssc.201402525
M3 - Article
C2 - 25187083
SN - 1864-5631
VL - 7
SP - 3112
EP - 3121
JO - ChemSusChem
JF - ChemSusChem
IS - 11
ER -
