期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 42, 页码 14864-14872出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc03302b
关键词
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资金
- National Natural Science Foundation of China [21971064, 21772040]
- Shanghai Science and Technology Committee [17520750100]
- Shanghai Municipal Science and Technology Major Project [2018SHZDZX03]
- Fundamental Research Funds for the Central Universities [222201717003, 50321101918001]
- Programme of Introducing Talents of Discipline to Universities [B16017]
Donor-acceptor-pi-acceptor (D-A-pi-A) organic dyes are promising candidates for efficient dye-sensitized solar cells (DSCs) and photocatalytic H-2 evolution due to their high range of visible-light response and strong light-capturing capabilities. However, the low charge transfer rate and severe charge recombination at the interface still limit their photovoltaic performance and photocatalytic activities. In this work, three indeno[1,2-b]thiophene-based sensitizers (SD1, SD2 and SD3) with a 2,3-diphenylquinoxaline (QT) auxiliary acceptor and cyclopentadithiophene (CPDT)-benzene/thiophene/furan different pi-bridge moieties have been synthesized and applied in DSCs and photocatalytic H-2 production to investigate the effect of the pi-bridge moiety on the photovoltaic performance and photocatalytic activities. Optical/electrochemical data and density functional theory (DFT) calculations clearly showed that the introduction of a benzene pi-bridge in SD1 resulted in a large torsional angle between CPDT and benzene, and then inhibited dye aggregation and charge recombination. Therefore SD1-based DSCs exhibited the highest power conversion efficiency (PCE) of 8.96% under one sun illumination. In addition, among the three sensitizers, the SD2 containing thiophene pi-bridge unit exhibited the best hydrophilicity and planarity with a torsional angle <1 degrees, which greatly improved the charge transfer process at the solution/dye/TiO2 interface and dye regeneration. Thus, a remarkable H-2 evolution rate of 23.5 mmol g(-1) h(-1) was obtained over the SD2@Pt/TiO2 photocatalyst.
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