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Quaternized chitosan-based anion exchange membrane for alkaline direct methanol fuel cells

Title
Quaternized chitosan-based anion exchange membrane for alkaline direct methanol fuel cells
Authors
Ryu, JeongkwanSeo, Jung YongChoi, Bit NaKim, Woo-JaeChung, Chan-Hwa
Ewha Authors
김우재
Issue Date
2019
Journal Title
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
ISSN
1226-086XJCR Link

1876-794XJCR Link
Citation
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY vol. 73, pp. 254 - 259
Keywords
Anion exchange membraneQuaternized chitosanVinylimidazoleHigh ionic conductivityAlkaline direct methanol fuel cells
Publisher
ELSEVIER SCIENCE INC
Indexed
SCIE; SCOPUS; KCI WOS scopus
Document Type
Article
Abstract
We synthesized a novel quaternized anion exchange membrane (AEM) that exhibits high ionic conductivity and structural stability, even under high pH conditions, by copolymerizing a chitosan-based membrane with vinylimidazole derivatives. During the process, a quaternized poly[O-(2-imidazolyethylene)-N-picolylchitosan (QPIENPC) was synthesized by modifying chitosan with a 4-pyridinecarboxaldehyde derivative and then copolymerizing the modified chitosan with 1-vinylimidzaole. The results revealed that the degree of quaternization is correlated with ionic exchange capacity, water absorption ability, linear expansion ratio, and hydroxide conductivity of the resulting membrane. The QPIENPC membrane was characterized by a high ionic conductivity of 10.15 mS cm(-1), 14 times greater that of the unfunctionalized chitosan membrane, as well as by low water absorption ability (36.17%) and linear expansion ratio (20.49%) at 80 degrees C. An alkaline direct methanol fuel cell (ADMFC) was fabricated using the prepared QPIENPC membrane as an anion exchange electrolyte membrane, with PtRu/C and Pt/C as the anode and cathode, respectively. The performance of this ADMFC is promising even under high pH conditions, with the peak power density of 10.42 mW cm(-2) and corresponding current density of 28.76 mA cm(-2). Moreover, the thermochemical and mechanical strengths of the QPIENPC membrane were higher than those of the chitosan membrane. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
DOI
10.1016/j.jiec.2019.01.033
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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