用于高效染料敏化太阳能电池的杂多酸修饰TiO₂光阳极工作机制的详细研究。
A detailed study on the working mechanism of a heteropoly acid modified TiO2 photoanode for efficient dye-sensitized solar cells.
作者信息
Jiang Yanxia, Yang Yulin, Qiang Liangsheng, Fan Ruiqing, Li Liang, Ye Tengling, Na Yong, Shi Yan, Luan Tianzhu
机构信息
Department of Chemistry, Harbin Institute of Technology, Harbin, 150001, P. R. China.
出版信息
Phys Chem Chem Phys. 2015 Mar 14;17(10):6778-85. doi: 10.1039/c4cp05795c.
A novel heteropolyacid (HPA) K6SiW11O39Ni(H2O)·xH2O (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.
一种新型杂多酸（HPA）K6SiW11O39Ni（H2O）·xH2O（SiW11Ni）修饰的TiO2已成功合成，并引入到染料敏化太阳能电池（DSSC）的光阳极中。HPA修饰的光阳极（SiW11Ni/TiO2）与P25粉末按2∶8的比例混合制成的电池性能优于使用原始P25光阳极的电池。光电流增加了31%，转换效率提高了22%。通过紫外可见光谱、光谱电化学光谱、暗电流、强度调制光电流光谱和强度调制光电压光谱、开路电压衰减和电化学阻抗谱对杂多酸的作用进行了深入研究。结果表明，SiW11Ni修饰的界面层可以增强电子的注入和传输，进而抑制电子复合，从而延长电子寿命。此外，SiW11Ni的引入可以同时拓宽可见光区域的吸收，最终有效提高能量转换效率。
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