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

doi:10.7503/cjcu20140135

Abstract

Abstract:

A Pt/Ti counter electrode of dye-sensitized solar cell(DSSC) was prepared by displacing electrodeposited Cu on a Ti sheet in H₂PtCl₆ 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 photocurrent 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 reveal that the improved performance of the DSSC with the Pt/Ti counter electrode is assigned to the higher electrochemical 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.

Key words: Dye-sensitized solar cell(DSSC), Counter electrode, Electrodeposition, I-/ $I 3 -$ redox couple

CLC Number:

O646

TrendMD:

WANG Yaoqiong, RAN Xiuzhi, GAO Huanfang, LI Li, WEI Zidong. Improvement Performance of Dye-sensitized Solar Cells with Pt/Ti Counter Electrode Prepared by Electrodeposition-displacement^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 1988.

Figures/Tables 6

Fig.1 FE-SEM images of FTO(A, B), Pt/FTO(C), Ti sheet(D), Cu/Ti(E) and Pt/Ti(F) electrodes

Fig.2 Cyclic voltammogram of counter electrodes Pt/FTO(a) and Pt/Ti(b) at a sweep rate of 50 mV/s in 0.5 mol/L H2SO4

Fig.3 Cyclic voltammograms of the counter electrodes Pt/FTO(a) and Pt/Ti(b) at a scan rate of 50 mV/s in acetonitrile solution of 10 mmol/L LiI, 1 mmol/L I2 and 0.1 mol/L LiClO4

Fig.4 J-V curves of DSSCs with counter electrodes Pt/FTO(a) and Pt/Ti(b)

Table 1 Photoelectric parameters of DSSCs with different counter electrodes

Counter electrode	J_sc/(mA·cm^-2)	V_oc/V	Fill factor	η(%)	Pt loading/(μg·cm^-2)
Pt/FTO	12.34	0.81	0.63	6.30	65
Pt/Ti	14.26	0.79	0.68	7.61	72

Fig.5 Electrochemical impedance spectra for DSSCs under illumination(AM=1.5) using electrodes Pt/FTO(a) and Pt/Ti(b)

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