Carbon quantum dots coated BiVO4 inverse opals for enhanced photoelectrochemical hydrogen generation

Carbon quantum dots (CQDs) coated BiVO4 inverse opal (io-BiVO4) structure that shows dramatic improvement of photoelectrochemical hydrogen generation has been fabricated using electrodeposition with a template. The io-BiVO4 maximizes photon trapping through slow light effect, while maintaining adequ...

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Bibliographic Details
Published in:Applied physics letters 2015-04, Vol.106 (15)
Main Authors: Nan, Feng, Kang, Zhenhui, Wang, Junling, Shen, Mingrong, Fang, Liang
Format: Article
Language:English
Subjects:
Applied physics
Bismuth oxides
Carbon
Conversion coating
Electromagnetic absorption
Hydrogen production
Photonic crystals
Quantum dots
Quantum efficiency
Redox reactions
Thin films
Vanadates
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Summary:Carbon quantum dots (CQDs) coated BiVO4 inverse opal (io-BiVO4) structure that shows dramatic improvement of photoelectrochemical hydrogen generation has been fabricated using electrodeposition with a template. The io-BiVO4 maximizes photon trapping through slow light effect, while maintaining adequate surface area for effective redox reactions. CQDs are then incorporated to the io-BiVO4 to further improve the photoconversion efficiency. Due to the strong visible light absorption property of CQDs and enhanced separation of the photoexcited electrons, the CQDs coated io-BiVO4 exhibit a maximum photo-to-hydrogen conversion efficiency of 0.35%, which is 6 times higher than that of the pure BiVO4 thin films. This work is a good example of designing composite photoelectrode by combining quantum dots and photonic crystal.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4918290