Importance

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Abstract

Simplified and improved solid polymer fuel cells for operation at near ambient conditions of temperature and pressure and without humidification are disclosed. In a first embodiment, a fuel cell is disclosed having two electrodes with opposing surfaces and an electrolyte comprising a solution of a proton conducting material deposited at the central portion of the surface of each electrode leaving the outer periphery of each electrode surface exposed. A slightly oversized non-conducting plastic type film having a central hole is located between and in contact with the electrodes, where its central hole surrounds and contacts the electrolyte deposits. The film is bonded with the electrodes and acts as a barrier for reactant cross-overs. In a second embodiment, the electrolyte deposit is thinner and located along the entire surface of the electrodes. A slightly oversized solid polymer electrolyte membrane is located between and is in contact with the electrolyte deposits. The membrane has a low gram equivalent weight, or is thinner but has a higher gram equivalent weight. Thus, the membrane easily transfers protons at a reduced internal electrolyte resistance, making operations possible at mild conditions without humidification.

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First Claim