Dielectric and conduction mechanism studies of PVA-orthophosphoric acid polymer electrolyte

Abstract

Polyvinyl alcohol (PVA)-based proton conducting polymer electrolytes have been prepared by the solution cast technique. The conductivity is observed to increase from 10 −9 to 10 −4 S cm −1 as a result of orthophosphoric acid (H 3 PO 4 ) addition. The plot of conductivity vs temperature shows that a phase transition occurred at 343 K in the sample PVA-33 wt% H 3 PO 4 . The β-relaxation peak is observed at 313 K. The glass transition temperature of PVA-33 wt% H 3 PO 4 is 343 K. Orthophosphoric acid seems to play a dual role, i.e., as a proton source and as a plasticizer. The ac conductivity σ ac = Aω s was also calculated in the temperature range from 303 to 353 K. The conduction mechanism was inferred by plotting the graph of s vs T from which the conduction mechanism for sample PVA-17 wt% H 3 PO 4 was inferred to occur by way of the overlapping large polaron tunneling (OLPT) model and the conduction mechanism for the sample PVA-33 wt% H 3 PO 4 by way of the correlated barrier height (CBH) model.

Thermal, vibrational and Ac impedance studies on proton conducting polymer electrolytes based on poly(vinyl acetate)

“…PVA complexed with inorganic acid has been already reported by Vargas et al, and has reported the plasticization effect of acids and water in PVA [16]. Dielectric and conduction properties of PVA complexed with H 3 PO 4 have been studied by Kufian et al [17]. Dielectric properties, vibrational and NMR studies on PVA doped with H 3 PO 4 and dielectric properties on PVA doped with H 2 SO 4 have been studied by Singh et al [18,19].…”

A Flexible Ionic Liquid Gelled PVA‐Li2SO4 Polymer Electrolyte for Semi‐Solid‐State Supercapacitors

“…This is attributed to the increased amount of charge carriers, Li + ions from Li 2 SO 4 . [ 10,30 ] When the ratio of PVA:BMIMCl:Li 2 SO 4 is 1:3:2.2, the ionic conductivity of the FGPE reaches the maximum value (37 mS cm −1 ).…”

Dual Planar‐Helix Type Energy Storage Wires to Circumvent Universal Energy Lag Effect

“…Carbon allotropes were well known members of supercapacitor electrodes, [ 31,32 ] and PVA/H 3 PO 4 GPE is widely used due to its nontoxic nature and possible coupling of charge transport. [ 33,34 ] The GPE in the system serves as a separator, glue, electrolyte, and elastic skeleton component at once. The dual planar-helix supercapacitor wires do not require the additional loading of active materials or post treatment to increase their performance, which is another distinct advantage of this system over conventional wire-type supercapacitors from an engineering view point.…”