Excellent visible-light photocatalytic hydrogen production efficiency: Hollow-structured TiO2/CdS/Au or hollow-structured TiO2/Au/CdS ternary heterojunction nanocomposites?

Two ternary heterojunction composites, namely hollow-structured TiO2/CdS/Au and hollow-structured TiO2/Au/CdS, were successfully synthesized by preparing hollow-structured TiO2 first, followed by the deposition of Au and CdS (with different deposition sequences), respectively. In these two composite...

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Bibliographic Details
Published in:Journal of alloys and compounds 2024-04, Vol.980, p.173629, Article 173629
Main Authors: Liang, Yu, Sun, Jiajun, Lu, Yu, Xiu, Mingzhen, Zhang, Jianghong, Yue, Junrong, Li, Wei, Ding, Hao, Xu, Guangwen, Xue, Can, Huang, Yizhong
Format: Article
Language:English
Subjects:
Au nanoparticles
CdS nanoparticles
Deposition sequence
Hollow TiO2 nanotube
Photocatalytic efficiency
Ternary heterojunction
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Summary:Two ternary heterojunction composites, namely hollow-structured TiO2/CdS/Au and hollow-structured TiO2/Au/CdS, were successfully synthesized by preparing hollow-structured TiO2 first, followed by the deposition of Au and CdS (with different deposition sequences), respectively. In these two composites, hollow-structured TiO2 nanotubes provide 1D structure with large specific area, which facilitate the immobilization of CdS and Au nanoparticles and the transfer of electrons. CdS is visible-light responsive and Au nanoparticles can improve photocatalytic efficiency by the formation of schottky barrier and surface plasmon resonance effect (SPR). The structures and phases, morphologies, surface and optical properties of the two composites were systematically characterized. TiO2/CdS/Au ternary heterojunction composite has efficient light absorption ability and excellent performances in photocatalytic hydrogen generation (up to 3600 μmol h−1 g−1), which is more than 4 times higher than that of TiO2/Au/CdS (800 μmol h−1 g−1). Therefore, in this way, we present a promising strategy to construct hybrid photocatalysts for hydrogen production. •Hollow-structured TiO2/CdS/Au and TiO2/Au/CdS heterojunction photocatalysts were synthesized.•TiO2/CdS/Au exhibited excellent visible-light activity on H2 generation.•The hollow-structured TiO2/CdS/Au improved the separation and transfer efficiency of electrons.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2024.173629