Effect of deep eutectic solvent in proton conduction and thermal behaviour of chitosan-based membrane

• Published in: Journal of molecular liquids Vol. 269; pp. 675 - 683
• Main Authors: Wong, C.Y., Wong, W.Y., Walvekar, R., Loh, K.S., Khalid, M., Lim, K.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2018
• Subjects: Chitosan-CMC biocomposite; Deep eutectic solvent (DES); Fuel cell; Polymer electrolyte membrane (PEM); Chitosan-CMC biocomposite; Fuel cell; Deep eutectic solvent (DES); Polymer electrolyte membrane (PEM)
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.08.102

This work aims to study the effect of choline chloride (ChCl) and urea based deep eutectic solvent (DES) on the proton conduction and thermal properties of chitosan-carboxymethylcellulose (Chitosan-CMC) membrane. Chitosan-CMC biocomposites were prepared in different ratios of 5:95, 10:90, 25:75, 50:50 and 75:25 with DES and was characterised. This study showed a positive improvement the proton conductivity without excessive swelling using DES in comparison with those without DES, with a slight trade-off on the thermal stability. The sample corresponding to 50 wt% of chitosan showed the highest proton conductivity of 1.57 × 10−2 S/cm, which was slightly lower compared to Nafion-117 membrane (8.6 × 10−2 S/cm). The study revealed the blend film with 75 wt% of chitosan with the presence of DES has a potential for polymer electrolyte membrane (PEM) with a low but sufficient water uptake of 49.4% to avoid structural disintegration despite a lower proton conductivity obtained. •Chitosan-carboxymethylcellulose membrane showed low proton conductivity.•Choline chloride:urea deep eutectic solvent (DES) improved proton conductivity.•DES reduces membrane swelling in moisture condition.•DES increases glass transition temperature of membrane.