摘要 |
The membranes according to the invention can be obtained from polyazoles having an inherent viscosity of greater than 1.1 dl/g by means of a method having the following steps: a) preparation of a solution of the polyazoles in organic solvents, b) shaping the obtained solution to form a membrane shape, c) heating of the solution which has been brought into the membrane shape to a temperature in the range of from 50 to 90°C until a self-supporting membrane has been formed, and d) tempering the membrane obtained from step c) at increasing temperatures in the range of from 120 to 500°C until the content of solvents in the membrane is less than 5% by weight. The membranes according to the invention can be used in high-temperature fuel cells. They have increased mechanical stability and, after doping with phosphoric acid, have a high degree of long-term stability at the operating temperatures of the high-temperature fuel cells up to 250°C. |
申请人 |
SARTORIUS AG;GOTTLOEBER, MANFRED;MAEHR, ULRICH;MELZNER, DIETER;PRETORIUS, CARSTEN;REICHE, ANNETTE;WEISSHAAR, STEFAN;GRONWALD, OLIVER |
发明人 |
GOTTLOEBER, MANFRED;MAEHR, ULRICH;MELZNER, DIETER;PRETORIUS, CARSTEN;REICHE, ANNETTE;WEISSHAAR, STEFAN;GRONWALD, OLIVER |