The Electronic-dialysis Of Block Copolymer Of PVA· The Evaluation Of The Performance Of DMAFC Using The Polymer Electrolyte Membrane

Now as a direct methanol fuel cell (DMFC) in the polymer electrolyte membrane (PEM) is Nafionl17. This film has excellent ionic conductivity, high chemical stability, but also has the opposite in the methanol fuel swelling degree and hinder methanol is low, the price is high, the environmental load and other issues. There is also a lot of fuel methanol permeability, low output power. In order to popularize and apply it to the DM AFC, it is necessary to develop a low cost, high methanol barrier PEM. Due to the catalytic activity in the alkaline environment of DMAFC is very high, the platinum electrode can be used instead of expensive transition metal price. Also, because the direction of the movement of ions and methanol by in the opposite direction, the methanol permeability decrease, but now the research on PEM film of DMAFC is not thorough.This study prepared the PVA DMAFC film and had a reaerch on the basic characteristics and power characteristics of membrane. Because PVA(Poly vinyl alcohol) is a poor solvent methanol and meanwhile it hasthe advantage of high mechanical strength, hydrophilicity, crystalline and low cost, it is promising to use as a polymer matrix. We can change the properties by the physical and chemical cross-linking on the PVA.The results show that with the increasing of the concentration of Glutaraldehyde solution, the water uptake-. the ionic conductivity and the methanol permeability is decreasing. However, the tensile strengths charge density and the sheet resistance is increasing. Moreover, we can find that there is no relationship between the concentration of GA solution and the ion exchange capacity.