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采用循环伏安法(CV)在掺杂氟的二氧化锡(FTO)导电玻璃上,成功聚合了24SO-和I-共掺杂的聚苯胺(PANI)对电极.利用扫描电子显微镜(SEM)、紫外-可见(UV-Vis)吸收光谱、傅里叶红外(FT-IR)吸收光谱、CV和电化学阻抗谱(EIS)等测试方法详细研究了I-作为第二种掺杂离子及Li I掺杂浓度对所制备的PANI对电极的表面形貌,结构和对I-/3I-氧化还原电对的催化活性的影响.SEM结果显示在聚合电解液中引入Li I改变了所制备的PANI对电极的形貌,可提供更多的催化反应活性位点,同时还改善了薄膜的孔隙性.值得注意的是,引入I-共掺杂可在一定程度上使3I-?3I-+2e-反应在相应的PANI电极上更容易进行.在反应体系中Li I浓度为0.02 mol·L-1时得到的PANI对电极,组装成电池时获得的电池效率最高可达6.52%,相当于Pt对电极6.95%的93.8%,比基于只掺杂24SO-的PANI对电极的光电转换效率提高了16%,说明24SO-和I-共掺杂的PANI对电极可以提高相应染料敏化太阳电池的光电转换性能,有望在未来成为Pt对电极的替代材料.
The polyaniline (PANI) electrode was successfully polymerized by cyclic voltammetry (CV) on fluorine-doped tin oxide (FTO) conductive glass. Scanning electron microscopy (SEM) , UV-Vis absorption spectra, FT-IR absorption spectra, CV and electrochemical impedance spectroscopy (EIS) and other testing methods were studied in detail I- as a second doping ion and Li I doping concentration on the morphology, structure and the catalytic activity of I- / 3I-redox couple of prepared PANI counter electrode SEM results showed that the introduction of Li I in the polymerization electrolyte changed the prepared PANI electrode morphology, can provide more catalytic reactive sites, but also improve the porosity of the film.It is noteworthy that the introduction of I-codoped to some extent, 3I-? 3I- + 2e-reaction was more easily carried out on the corresponding PANI electrode.While the PANI counter electrode obtained when the Li I concentration was 0.02 mol·L-1 in the reaction system, the cell efficiency obtained when assembled into a battery can reach as high as 6.52%, which is equivalent to The 93.8% of the Pt counter electrode was 6.95%, which was 16% higher than the photoelectric conversion efficiency of PANI based on only 24SO-, which indicates that 24SO- and I-codoped PANI of the electrode may increase the photoelectric conversion performance of the corresponding dye-sensitized solar cell, it is expected to be the future substitute material Pt electrode.