期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 10, 页码 6778-6785出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp05795c
关键词
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资金
- National Natural Science Foundation of China [21171044, 21371040]
- National key Basic Research Program of China (973 Program) [2013CB632900]
- Fundamental Research Funds for the Central Universities [HIT. IBRSEM. A. 201409]
- Innovation Research of Science in Harbin Institute of Technology [A201416, B201414]
A novel heteropolyacid (HPA) K6SiW11O39Ni(H2O).xH(2)O (SiW11Ni) modified TiO2 has been successfully synthesized and introduced into the photoanode of dye-sensitized solar cells (DSSCs). The performance of the cell with the HPA-modified photoanode (SiW11Ni/TiO2), mixed with P25 powder in the ratio of 2 : 8, is better than the cell with a pristine P25 photoanode. An increase of 31% in the photocurrent and 22% improvement in the conversion efficiency are obtained. The effect of the heteropolyacid was well studied by UV-vis spectroscopy, spectro-electrochemical spectroscopy, dark current, intensity-modulated photocurrent spectroscopy and intensity-modulated photovoltage spectroscopy, open-circuit voltage decay and electrochemical impedance spectroscopy. The results show that the interfacial layer modified by SiW11Ni can enhance the injection and transport of electrons, and then retard the recombination of electrons, which results in a longer electron lifetime. What's more, the introduction of SiW11Ni can simultaneously broaden the absorption in the visible region, eventually leading to an efficient increase in energy conversion efficiency.
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