Structural and ionic conductivity studies on proton conducting polymer electrolyte based on polyvinyl alcohol

Abstract

An attempt has been made to prepare a new proton conducting polymer electrolyte based on polyvinyl alcohol (PVA) doped with NH 4 NO 3 by solution casting technique. The complex formation between polymer and dissociated salt has been confirmed by X-ray diffraction analysis. The ionic conductivity of the prepared polymer electrolyte has been found by ac impedance spectroscopic analysis. The highest ionic conductivity has been found to be 7.5×10 −3 Scm −1 at ambient temperature for 20 mol% NH 4 NO 3 -doped PVA with low activation energy (~0.19 eV). The temperature-dependent conductivity of the polymer electrolyte follows an Arrhenius relationship, which shows hopping of ions in the polymer matrix.

Structural and ionic conductivity studies on P(ECH-EO):γ-BL:LiClO4 plasticized polymer electrolyte

“…2a-d). The absence of the high-frequency semicircle confirms that the total conductivity is mainly due to the ion conduction, a similar result has been reported by Hema et al [15,16] for the PVA:NH 4 Br and PVA:NH 4 NO 3 polymer electrolyte. The spike is characterized by the electrical double layer capacitance (C dl ) whose value can be found at any position on the spike [17] and is found to be in the order of~10 −9 F. It is interesting to observe that the ionic conductivity of solid polymer electrolyte 85P(ECH-EO):15LiClO 4 1.3×10 −5 Scm −1 at 303 K as reported by Nithya et al [18] has been increased by an order (10 −5 to 10 −4 ) by the addition of a plasticizer.…”

Proton Conductivity and Free Volume Properties in Per-Fluorinated Sulfonic acid/PTFE Copolymer for Fuel Cell

“…In the second zone after T g it is clear that the proton conductivity monotonically increases with temperature. It was reported that [21] the variation in proton conductivity with temperature in a polymer electrolyte was assigned to segmental motion, which increases the free volume of the polymer and either allows the ions to hop from one site to another or facilitates the translational ionic motion. By way of increasing the amorphous region, the polymer chain gains faster internal modes in which bond rotations produce segmental motion to inter-and intrachain ion hopping, and accordingly the level of proton conductivity turns out to be high.…”

Ionic conductivity and relaxation studies in PVDF-HFP:PMMA-based gel polymer blend electrolyte with LiClO4salt

“…For high conducting sample, low activation energy (E a ) is required to acivate the lithium ion for the physical transportation through polymer matrix which is caused by the completely amorphous nature. 32 According to Li et al 33 ions or cluster of ions migrate in the pores of polymer, amorphous domains swelled by electrolyte and along molecular chain of polymer. The migration of lithium ion along the molecular chains of polymer is not appreciable.…”