Self‐Humidifying Polymer Electrolyte Membranes for Fuel Cells

摘要: Polymer electrolyte fuel cells have attracted enormous interest as a primary power source for electric vehicles. Water management in the is one of complicated problems to be overcome. A new self-humidifying membrane proposed solve this problem. Self-humidification allows use very thin membranes, simultaneously allowing high performance cell. Use new, membranes makes system simple and ready cold starts also amenable abrupt load changes. The comprised 50 {micro}m thick Nafion containing 0.07 mg/cm{sup 2} platinum catalyst particles (d = 1 2 nm) few weight percent hygroscopic material such silica or titania ca. 5 7 nm). catalyze oxidation crossover hydrogen with oxygen generate water, which turn adsorbed by oxide particles. cell shows exceptionally stable even under ambient pressure conditions when operated saturated water at 20 C dry oxygen. internal resistance was measured 0.06 {Omega} cm{sup 2}, output 0.63 W/cm{sup i.e., 0.9 A/cm{sup 0.7more » V an energy efficiency 60%. voltage region 0.6 0.4 yielding current densities 1.6 2.5 2}. Hydrogen depleted self-humidification estimated less than these operating conditions.« less