Chemical Journal of Chinese Universities ›› 2014, Vol. 35 ›› Issue (6): 1293-1299.doi: 10.7503/cjcu20131250

• Physical Chemistry • Previous Articles     Next Articles

Preparation of PVP-based Iodine-iodide Gel-electrolyte and Its Application in DSSCs

LU Shanfu*(), LIU Yiyang, XIANG Yan   

  1. Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment,Beihang University, Beijing 100191, China
  • Received:2013-12-19 Online:2014-06-10 Published:2014-03-24
  • Contact: LU Shanfu E-mail:lusf@buaa.edu.cn
  • Supported by:
    † Supported by the Beijing Higher Education Young Elite Teacher Project, China(No. 29201493).

Abstract:

In the preparation of gel polymer electrolyte(GPE) for dye-sensitized solar cell(DSSCs), lithium iodide was used as the I- source, ethylene carbonate(EC) and propylene carbonate(PC) were used as the solvent, polyvinyl pyrrolidone(PVP) and polyvinylidene fluoride(PVDF) were used as the gelling agent. Raman spectroscopy, cyclic voltammetry and alternate current(AC) impedance were used to characterize the gel electrolyte. The results show that the concentration(mass fraction) of polymer and the ratios of PVP to PVDF and iodine to iodide have great influence on the performance of the GPE. The prepared GPE comes to the highest ion conductivity of 3.27 mS/cm at room temperature when the concentration of polymer is 10%[m(PVP)/m(PVDF)=80∶20] and the molar ratio of LiI/I2 is 30∶1 with the concentration of iodide as 0.042 mol/L. DSSC with the PVP-based GPE achieves a good output performance with open circuit voltage of 0.64 V, short circuit current density of 13.6 mA/cm2, fill factor of 0.595, the overall photoelectric conversion efficiency of 5.18% under 100 mW/cm2 of simulated sunlight and exhibits a good stability during the test time of 30 d. The new GPE which is cheap and available overcomes the problem of liquid electrolytes leakage in DSSCs.

Key words: Poly(vinylpyrrolidone), Polymer gel-electrolyte, Ionic conductivity, Dye-sensitized solar cell

CLC Number: