电沉积-置换法制备Pt/Ti对电极及其对染料敏化太阳能电池性能的提升

Improvement Performance of Dye-sensitized Solar Cells with Pt /Ti Counter Electrode Prepared by Electrodeposition-displacement

采用电沉积-置换法在Ti片上制备了染料敏化太阳能电池(DSSC)的对电极Pt/Ti.形貌表征结果显示,与传统热解法制备的Pt/FTO对电极相比,Pt/Ti对电极Ti基底上Pt催化颗粒的粒径和分散性得到显著改善.光电流-光电压特性曲线测试结果表明,以Pt/Ti为对电极的DSSC与以Pt/FTO为对电极的DSSC相比,光电转化效率提高了20.8%.由于Pt颗粒分散性和粒径的改善所引起的Pt催化性能的提高、Pt/Ti对电极更低的电阻以及Ti基底更好的反光性能是提升DSSC性能的原因.

A Pt/Ti counter electrode of dye-sensitized solar cell（ DSSC） was prepared by displacing electro-deposited Cu on a Ti sheet in H2 PtCl6 solution. Morphological characterization of the Pt/Ti electrode shows that the dispersion and size of Pt particles on Ti substrate is significantly improved in contrast to that of the Pt/FTO electrode prepared by pyrolysing Pt salt on a fluorine-doped oxide（ FTO） glass substrate. The photo-current density-voltage（ J-V） curves show that the overall energy conversion efficiency of DSSC with the Pt/Ti counter electrode increases by 20. 8% relative to that with the Pt/FTO counter electrode. The results also re-veal that the improved performance of the DSSC with the Pt/Ti counter electrode is assigned to the higher elec-trochemical surface area of the Pt/Ti counter electrode than the Pt/FTO, the lower electric resistance and the better reflecting ability of the Ti substrate than the FTO substrate.