FIELD: electrical engineering; fuel cells needing in-service regulation of polymeric-electrolyte membrane hydration level.
SUBSTANCE: heat-sensing polymer is introduced in proposed fuel cell to maintain optimal hydration of polymeric-electrolyte membrane. Heat-sensing polymer is disposed near membrane-electrode assembly so that gaseous fuel or oxidant is passed through heat-sensing polymer to membrane-electrode assembly. Heat-sensing polymer swells or shrinks in response to variations in membrane-electrode assembly temperature thereby varying intensity of gaseous-fuel or oxidant flow through heat-sensing polymer.
EFFECT: ability of maintaining optimal hydration of polymeric-electrolyte membrane, enhanced reliability of fuel cell mechanical design.
7 cl, 5 dwg
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