NISCAIR Online Periodicals Repository Community: Indian Journal of Pure & Applied Physics (IJPAP)

Study of diffusion and conduction in gamma irradiated solid polymer electrolytes by fractal model structure

Title: Study of diffusion and conduction in gamma irradiated solid polymer electrolytes by fractal model structure

Authors: Ghosal, Subhasish; Ray, Ruma; Ballabh, T K; Tarafdar, S

Abstract: Gamma irradiation changes the polymer microstructure and improves the ionic conductivity of Solid Polymer Electrolytes (SPE). The present paper introduces a deterministic fractal model of polymer molecules to study the effect of gamma irradiation on it. The effect of irradiation is implemented by repeated scission of molecules resulting in variation in polymer morphology. The ionic conductivity is assumed to be proportional to the effective velocity of ions. The velocity is calculated considering the trapping effect due to the random movement of ions through the large fractal polymer molecules and the segmental motion of the branches. Calculated conductivity is compared with the experimental curves which show a qualitative agreement.

Page(s): 324-327

Investigation on electrical and dielectric properties of PVP:KCLO₄ polymer electrolyte films

Title: Investigation on electrical and dielectric properties of PVP:KCLO₄ polymer electrolyte films

Authors: Ravi, M; Bhavani, S; Pavani, Y; Rao, V V R Narasimha

Abstract: Solid polymer electrolyte based on poly (vinyl pyrrolidone) (PVP) complexed with different weight per cent ratios of KClO₄ salt was prepared using solution cast technique. The complexation of the salt with polymer was confirmed by Fourier transform infrared (FT-IR) spectroscopy studies. Electrical conductivity was measured with ac impedance analyzer in the frequency and temperature range 1 Hz-1 MHz and 303 K-373 K, respectively. It was observed that the magnitude of conductivity has increased with the increase in the salt concentration as well as the temperature. The variation of ac conductivity with frequency obeys Jonscher power law. The dynamical aspects of electrical transport process in the polymer electrolyte were analyzed using complex electric modulus. The modulus spectra reveal the non-Debye nature of the material.

Page(s): 362-366

Application aspects of polymer electrolytes in solar cells

Title: Application aspects of polymer electrolytes in solar cells

Authors: Suthanthiraraj, S Austin

Abstract: Dye-sensitized solar cells (DSSCs) have aroused intense interest owing to their easy fabrication, low cost, simple preparation procedures and high energy conversion efficiency. Considering the fact that leakage and volatilization of liquid electrolytes hinder their practical applications in the case of DSSCs, polymer electrolytes with high ionic conductivity, excellent thermal and long-term stability are being used as alternatives to liquid electrolytes. This review focuses mainly on recent progress witnessed in the field of quasi-solid-state electrolytes suitable for DSSCs. The dependence of photovoltaic performance on the polymer content within the electrolyte employed in DSSCs, their working principles as well as latest developments are also discussed.

Page(s): 310-314

Effect of Sr doping on structural, electrical and electrochemical properties of Nd₂_-xSr_xNiO₄₊_δ mixed ionic-electronic conductors

Title: Effect of Sr doping on structural, electrical and electrochemical properties of Nd₂_-xSr_xNiO₄₊_δ mixed ionic-electronic conductors

Authors: Punde, J D; Khandale, A P; Bhoga, S S

Abstract: The Nd₂_-xSr_xNiO₄₊_δ(x = 0.2 and 0.4) solid solutions prepared by combustion synthesis are of submicron/superfine crystallites size. The linear variation in dc conductivity with oxygen partial pressure around Nd_1.6Sr_0.4NiO₄₊_δ is understood on the basis of defect chemistry. The electrochemical properties of the cathode material, studied using electrochemical impedance spectroscopy, reveal area specific resistance (ASR) = 0.84 ohm cm² at 973 K. The charge transfer process in cathode and across cathode-electrolyte interface is the rate limiting reaction.

Page(s): 376-380

NISCAIR Online Periodicals Repository Community: Indian Journal of Pure & Applied Physics (IJPAP)

Study of diffusion and conduction in gamma irradiated solid polymer electrolytes by fractal model structure

Investigation on electrical and dielectric properties of PVP:KCLO4 polymer electrolyte films

Application aspects of polymer electrolytes in solar cells

Effect of Sr doping on structural, electrical and electrochemical properties of Nd2-xSrxNiO4+δ mixed ionic-electronic conductors

Investigation on electrical and dielectric properties of PVP:KCLO₄ polymer electrolyte films

Effect of Sr doping on structural, electrical and electrochemical properties of Nd₂_-xSr_xNiO₄₊_δ mixed ionic-electronic conductors