期刊
JOURNAL OF MEMBRANE SCIENCE
卷 419, 期 -, 页码 65-71出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2012.06.051
关键词
Polyvinyl alcohol; Chitosan; Ionic conductivity; Methanol permeability; Alkaline direct methanol fuel cells
资金
- National Science Council of the Republic of China
- Chang Gung Memorial Hospital
A novel polyvinyl alcohol/chitosan, PCS, blended membrane is prepared by direct blend process and solution casting method. In order to reduce the swelling ratio and enhance the chemical and thermal stabilities of the PCS, PCS membrane is crosslinked with glutaraldehyde to get PCS-G membrane. These membranes are characterized by differential scanning calorimetry, X-ray diffraction, thermogravimetry analysis and mechanical properties of tensile strength and elongation at breaking. The structures of these membranes are identified with azocarmine G. The various membranes are immersed in KOH(aq) solution to form polymer electrolyte membranes and then the alkaline uptake and swelling ratio in the thickness (SWL) and plane direction (SWA) in membranes are studied. The ionic conductivity and methanol permeability of the membranes are conducted. It is found that the value of methanol permeability through the membrane is lower than that of Nafion membrane. Compared to data of Nafion and other studies, PCS91-G membranes with higher selectivity suggest their potential applications in DMFC. (C) 2012 Elsevier B.V. All rights reserved.
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