期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 1, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.107030
关键词
Quantum dots; Photocatalytic activity; Microflowers; Hydrogen production; Organic dye removal
资金
- DST Solar Energy Harnessing Center [DST/TMD/SERI/HUB/1(C)]
- SERB project [EMR/2017/000794]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie Grant [847413]
- programme of the Minister of Science and Higher Education entitled PMW in the years 2020-2024 [5005/H2020-MSCA-COFUND/2019/2]
- [DST/TMD-EWO/WTI/2K19/EWFH/2019/122(G)]
- [IUAC-UFR-67304]
Integration of CdTe quantum dot with ZnIn2S4 effectively reduces the bandgap of the material, enhancing absorption in the visible spectrum and generating more charge carriers. This leads to excellent performance in photocatalytic dye degradation and hydrogen production processes, showcasing improved efficiency in charge carrier separation and transfer.
Solar hydrogen production has been successfully demonstrated with CdTe quantum dot (QD) supported porous hierarchical ZnIn2S4. A reduction in effective bandgap from 2.7 eV (for ZnIn2S4) to 2.56 eV (for ZnIn2S4/CdTe QD composite) was observed. An efficient charge transfer between ZnIn2S4 and CdTe in the ZnIn2S4/CdTe QD composite is confirmed from Photoluminescence (PL) studies. Effective reduction in bandgap of composite heterostructure enhances the absorption in visible spectrum and generates more charge carriers, as corroborated from PEC measurements (similar to 5.7 mu A/cm(2)). In the present work 3% CdTe QDs decorated with ZnIn2S4 (ZCd(3)) exhibits higher photocatalytic activity during degradation of Rhodamine B (RhB) dye by 94% in 35 min. An excellent photocatalytic performance of ZCd(3) sample was also noted during H-2 production yielding a production rate of 1070 mu mol g(-1) in 3 h. It is believed that the integration of CdTe quantum dot with ZnIn2S4 enhances the photocatalytic efficiency of ZnIn2S4 by improving charge carrier separation and transfer.
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