Novel Proton Conducting Solid Bio-polymer Electrolytes Based on Carboxymethyl Cellulose Doped with Oleic Acid and Plasticized with Glycerol.

M N Chai,M I N Isa

doi:10.1038/srep27328

Abstract

The plasticized solid bio-polymer electrolytes (SBEs) system has been formed by introducing glycerol (Gly) as the plasticizer into the carboxymethyl cellulose (CMC) doped with oleic acid (OA) via solution casting techniques. The ionic conductivity of the plasticized SBEs has been studied using Electrical Impedance Spectroscopy. The highest conductivity achieved is 1.64 × 10−4 S cm−1 for system containing 40 wt. % of glycerol. FTIR deconvolution technique had shown that the conductivity of CMC-OA-Gly SBEs is primarily influenced by the number density of mobile ions. Transference number measurement has shown that the cation diffusion coefficient and ionic mobility is higher than anion which proved the plasticized polymer system is a proton conductor.

Highlights

Biodegradable materials attract enormous attention worldwide as a result of white pollution, one of the environmental crises
The development of carboxymethyl cellulose (CMC)-OA solid biopolymer electrolytes (SBE) is following the previous work done reported in ref. 22. 1 g of CMC was dissolved in distilled water while 0.25 g of oleic acid was dissolved in ethanol in separate beaker before combining both solutions
Proton conducting solid bio-polymer electrolytes based on carboxymethyl cellulose and oleic acid with different compositions of Gly as plasticizer had been prepared using solution casting techniques

Summary

Introduction

Biodegradable materials attract enormous attention worldwide as a result of white pollution, one of the environmental crises. The polymers can solvate the dopant if there is direct interaction between the lone pair electron of the heteroatom such as oxygen or nitrogen in the polymer and cation of the ionic dopant[2,17] It is a significant develop solid biopolymer electrolytes (SBE) by using natural polymer. According to previous researches[23,24,25], plasticizers would turn the texture of polymer to become softer and more flexible, and enhance the chemical and mechanical stability of membranes since they could penetrate and increase the distance of molecules and decrease the polar groups of polymer In this present work, glycerol (Gly) was chosen as the plasticizer in order to increase the ionic mobility of the materials and elevate the conductivity of the CMC- 20 wt. Details analysis on the ionic transport properties via FTIR-deconvolution technique open-up to new insights on the conduction behaviour of the plasticized bio-based materials

Methods

Discussion

Conclusion