Enhancement in hydrolytic stability and proton conductivity of optimised chitosan/sulfonated poly(vinyl alcohol) composite membrane with inorganic fillers. (16th August 2021)

• Record Type: Journal Article
• Authors: Wong, Chun Yik; Wong, Wai Yin; Loh, Kee Shyuan; Khalid, Mohammad; Daud, Wan Ramli Wan; Lim, Kean Long; Walvekar, Rashmi
• Is Part Of: International journal of energy research. Volume 45:Number 15(2021)
• Page Start: 21307
• Page End: 21323
• Publication Date: 2021-08-16
• Subjects: chitosan/sulfonated poly(vinyl alcohol) -- inorganic filler -- polymer electrolyte membrane -- Taguchi method; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7181
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The study aimed to obtain a chitosan/sulfonated poly(vinyl alcohol) (CS/SPVA) membrane with optimised hydrolytic stability and ion conduction properties by using the Taguchi method. Three factor variables including concentration of glutaraldehyde (GA), crosslinking temperature and crosslinking time were considered. An L18 orthogonal array along with the approach of larger‐the‐better was selected for the optimisation. The highest value in S/N ratio of −19.9947 was observed on sample set 9 without GA involvement, crosslinking temperature of 110°C and time of 90 minutes. The ionic conductivity and water uptake were 8.21 mS/cm and 82.05%, respectively, compared to 7.34 mS/cm and 215.9% of the nonoptimised CS/SPVA15. Further inspection with the incorporation of inorganic fillers (titanium dioxide (TiO2 ), silicon dioxide (SiO2 ) and sulfonated graphene oxide (SGO)) was conducted on the optimised CS/SPVA15. The thermomechanical properties of CS/SPVA15 composite membrane was improved with inorganic fillers. In terms of electrochemical properties, ionic conductivity was reduced because of the enhancement in thermal stability. The inorganic filler inhibits the accessible functional groups and increase the ionic resistance of CS/SPVA15 composite membrane. Amongst all samples, CS/SPVA15‐SGO is the most optimised with a minor trade‐off in ionic conductivity (6.82 mS/cm) and IEC (0.8866 mequiv/g) compared with CS/SPVA15, whilst delivering an exceptional hydrolytic stability (76.41%). Abstract : The hydrolytic stability and proton conductivity of chitosan/sulfonated poly(vinyl alcohol) composite membrane was optimised. Parametric optimisation via Taguchi method on membrane synthesis revealed the improvements of ionic conductivity and water uptake, from 7.34 mS/cm to 8.21 mS/cm, and 215.9% to 82.05%, respectively. Further, the incorporation of SGO inorganic filler to the optimised CS/SPVA15 has enhanced the hydrolytic stability (76.41%) with a minor trade‐off in proton conductivity (6.82 mS/cm).