技術報文
Proton Conductive Electrolyte Membranes Based on Tungstic Acid and Poly(vinyl alcohol) Hybrid Compounds
2004 年 72 巻 2 号 p. 111-116
詳細
2004 年 72 巻 2 号 p. 111-116
Membranes based on tungstic acid and poly(vinyl alcohol) hybrid compounds (W/PVA membranes) were synthesized by a low cost aqueous neutralization process, and proton conductivity, water resistance, swelling and methanol permeability were examined. The W/PVA membranes exhibited conductivity of 3.6 ×10-3 Scm-1 at 80°C and 90% relative humidity, in addition to a sufficient hot water resistance. By a treatment with iso-butyraldehyde, swelling of the W/PVA membranes was remarkably reduced, and methanol permeability for the membranes with the iso-butyraldehyde treatment is far lower than that of Nafion® 117. The W/PVA membranes are promising as an electrolyte for direct methanol fuel cells and others.
