| 초록 |
The Direct Methanol Fuel Cell is considered to hold the strongest potential for application in small sized devices such as portable electric appliances due to the low operating temperature, simple structure, and the easiness of the fuel handling. However, in actual system, methanol also permeates through the membrane to the cathode side, which lowers the fuel efficiency and thus reduces the cathode performance. Methanol crossover is the most serious obstacle to use the present polymer membrane as the primary electrolyte for DMFC. In order to solve the problem, highly sulfonated polysulfone copolymer was blended with nonsulfonated polysulfone copolymer. The former was used to maintain the proton conductivity and the later was used to block the fuel permeation through the membrane. By varying the drying condition and the concentration of initial casting solution, different phase separated morphologies were induced and these patterns showed characteristic transport properties. |
