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Research articles

ScienceAsia 49S (2023):ID 14-22 |doi: 10.2306/scienceasia1513-1874.2023.s005

The effects of plasticizer agent in mesoporous phosphotungstic acid modified chitosan membrane and its performances for direct methanol fuel cell application

Lukman Atmajaa, Arif Priyanggaa,?*, Yohana Ivana Kedanga,b, Mardi Santosoa, Juhana Jaafarc, Djoko Hartantoa

ABSTRACT:     Chitosan (Cs) is an attractive material with outstanding properties such as excellent film-forming properties, biodegradability, and ease of chemical modification. The Cs membrane is usually applied as part of the proton exchange membrane (PEM) material in fuel cell applications. The drawbacks of the Cs membrane can be surmounted by applying the hydrophilic/plasticizer agent and combining the modified heteropoly acid filler. In this research, the Cs membrane was successfully fabricated using a solvent-evaporation method with the incorporation of mesoporous phosphotungstic acid (m-PTA) and glycerol (gly). The outstanding performances were obtained by the Cs/gly-1/m-PTA membrane, which had the first degradation temperature up to 200 ?C, chemical stability with the lowest weight loss at 18.33?0.762%, and the highest proton conductivity at 5.13 mS/cm. The other performances exchange capacity (IEC) at 2.949?0.022 mmol/g, and water and methanol uptake at 89.05?0.092% and 1.26?0.031%, respectively. In comparison to the pristine Cs membrane, which exhibits lower proton conductivity and higher methanol permeability at 2.40 mS/cm and 1.003?10?5 cm2 /s, respectively, the addition of m-PTA filler and gly as a plasticizer agent increases the performance of the chitosan properties used in direct methanol fuel cell membranes.

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a Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya 60111 Indonesia
b Department of Chemistry, Faculty of Agriculture, Universitas Timor, Kefamenanu 85613 Indonesia
c Advanced Membrane Technology (AMTEC) Research Centre, Universiti Teknologi Malaysia, UTM Johor Bahru, Johor 81310 Malaysia

* Corresponding author, E-mail: arifpriyangga97@gmail.com

Received 18 Jan 2023, Accepted 1 Sep 2023