Durability- Fuel cell applications generally require adequate performance to be maintained over long periods of time.Efforts include developing ion-exchange membrane electrolytes with enhanced efficiency and durability at reduced cost improving membrane electrode assemblies (MEAs) with high power density through integration of state-of-the-art MEA components modeling to understand system design and operating conditions and developing stacks with high efficiency at rated power and high-performing BOP components, such as air management components with low parasitic losses. DOE has set ultimate targets for fuel cell system lifetime under realistic operating conditions at 8,000 hours for light-duty vehicles, 30,000 hours for heavy-duty trucks, and 80,000 hours for distributed power systems. In the most demanding applications, system reliability and robustness is required under dynamic and harsh operating conditions.
Realistic operating conditions include starting and stopping, freezing and thawing, impurities in the fuel and air, and humidity and dynamic load cycles that result in stresses on the chemical and mechanical stability of the fuel cell system materials and components.
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