Poly(methyl acrylate) (PMA)-tetrapropylammonium iodide (TPAI) and poly(vinyl acetate) (PVAc)-TPAI solid polymer electrolytes were prepared by solution casting method. DSC, FTIR, and conductivity results are reported. TPAI interacts with PMA and PVAc to form PMA-TPAI and PVAc-TPAI complexes. Formation of PMA-TPAI and PVAc-TPAI complexes are supported by the DSC and FTIR studies. Linear relationship for the dependence of glass-transition temperature, T g , on salt concentration allows the estimation of the complexation extent between polymer and salt. A greater extent of complexation for PMA with TPAI is observed and correlated with the FTIR results. The conductivities achieved at 15 wt % of TPAI for PMA and PVAc are 2.6 × 10 −11 and 1.3 × 10 −11 S cm −1 , respectively. Higher dielectric constant and lower T g of PMA result in higher number and mobility of ions, which lead to higher conductivity in accordance with σ = enμ. All-solid-state dye-sensitized solar cells (DSSCs) were assembled with PMA-TPAI and PVAc-TPAI electrolytes. DSSC efficiencies achieved for PMA and PVAc are 2.41% and 2.05%, respectively. Better performance of DSSC with PMA electrolyte is attributed to higher short-circuit current density, J sc , and lower recombination loss. Lower J sc , higher recombination loss, and degradation of counter electrode are the reasons for DSSC degradation.
Polymer electrolytes based on the blends of poly(methyl acrylate) (PMA) and poly(vinyl acetate) (PVAc) were prepared using tetrapropylammonium iodide (TPAI) salt and 1-butyl-3-methylimidazolium iodide (BMII) ionic liquid. Single transition between the glass transition temperatures of the constituents indicates the miscibility of PMA and PVAc over the entire composition range. The presence of TPAI and BMII does not affect the miscibility of PMA and PVAc. The complexation in the PMA/PVAc-TPAI-BMII is supported by the differential scanning calorimetry and Fourier transform infrared spectroscopic studies. Conductivity increases by two order of magnitudes with the incorporation of 5 wt% of BMII. Conductivity increment is due to the extra charge carriers provided by BMII. Electrolyte films were sandwiched between titanium dioxide photoanode and platinum counter electrode for dye-sensitized solar cells (DSSCs) assembly. The addition of BMII increases the efficiency of DSSC from 2.79% to 4.62%.
Ionic conductivity for polymethyl acrylate (PMA) and polyvinyl acetate (PVAc) blend at composition 90:10 in the presence of tetrapropyl ammoinum iodide (TPAI) showed linear increment with temperature. At selected frequencies, the values for both dielectric constant, εr and dielectric loss, εi are found to increase with temperature. It is also found that the variation of εr is in agreement with conductivity variation of PMA/PVAc-TPAI samples. The imaginary part of electric modulus,Mi showed the occurance of dispersion peak. Relaxation time of ionic charge carrier are extracted from the Mi maximum peak at various temperatures. It is found that relaxation time decreased with increasing temperature from ~10-4 s at 343 K to ~10-5 s at 373 K.
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