Journal
JOURNAL OF POWER SOURCES
Volume 188, Issue 1, Pages 24-29Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.11.108
Keywords
Chitosan; Heteropolyacid; Composite membrane; Methanol permeation; Proton-conducting
Funding
- Science and Technology Ministry of China [2007AA05Z159, 2007AA03Z218]
- National Natural Science Foundation of China [20373068, 20433060]
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As inorganic proton conductors. phosphomolybdic acid (PMA), phosphotungstic acid (PWA) and silicotungstic acid (SiWA) are extremely attractive for proton-conducting composite membranes. An interesting phenomenon has been found in our previous experiments that the mixing of chitosan (CS) solution and different heteropolyacids (HPAs) leads to strong electrostatic interaction to form insoluble complexes. These complexes in the form of membrane (CS/PMA, CS/PWA and CS/SiWA composite membranes) have been prepared and evaluated as novel proton-conducting membranes for direct methanol fuel cells. Therefore, HPAs can be immobilized within the membranes through electrostatic interaction, which overcomes the leakage problem from membranes. CS/PMA, CS/PWA and CS/SiWA composite membranes were characterized for morphology, intermolecular interactions, and thermal stability by SEM, FTIR, and TGA, respectively. Among the three membranes, CS/PMA membrane was identified as ideal for DMFC as it exhibited low methanol permeability (2.7 x 10(-7) cm(2) s(-1)) and comparatively high proton conductivity (0.015 S cm(-1) at 25 degrees C). (C) 2008 Elsevier B.V. All rights reserved.
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