| Summary: | 碩士 === 雲林科技大學 === 化學工程與材料工程研究所 === 96 === This study investigated the potential of the hydrocarbon membranes consisting of poly(vinyl alcohol) (PVA), sulfosuccinic acid (SSA) and poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-maleic acid) P(AMPS-co-MA) for direct methanol fuel cells (DMFC) applications. The effect of AMPS/MA molar ratios on membrane properties was characterized by water uptake, proton conductivity, and methanol permeability. These properties increased with AMPS/MA molar ratio increased from 1/3 to 2/1. Specifically, when AMPS/MA molar ratio increased to 2/1, named A2M1 membrane, the proton conductivity of this membrane is comparable to Nafion 115 and the methanol permeability is only half that of Nafion 115. In addition, the A2M1 membrane shows a much higher storage modulus than that of Nafion 115. Moreover, the sorption and transport properties in terms of water/methanol uptake and methanol permeability in PVA-PAM membrane and Nafion 115 at different methanol concentration were also investigated. For example, with the increase of methanol concentration form 0 to 75%, the water/methanol uptake of A2M1 membrane decreased form 73.1 to 48.2 wt. % and the methanol permeability decreased to 4.58×10-7(cm2/s). However, Nafion 115 membrane shows a different sorption and transport behavior. With the increase of methanol concentration, the water/methanol uptake in Nafion 115 increased form 32.3 to 89.0 wt. % and the methanol permeability increased form 1.6×10-6 to 5.43×10-6 (cm2/s). Among mentioned results, the PVA-PAM membranes were regarded to DMFC application, especially for high methanol feeding condition.
|
|---|
