Abstract
A proton exchange membrane fuel cell system (PEMFCS) operated electroytically at its limiting current was proposed previously as a technology to separate the H2 and He through the electrochemical oxidation of H2. In this work the fraction of H2 remaining in the effluent of two different sized PEMFCs with different flow field designs was studied at several operating conditions which included different: system temperatures, inlet relative humidity (R.H.), and system pressures to determine the most efficient operating condition. Experiments were performed at a fixed dry gas flow rate with an inlet H2 dry gas fraction of 10 %. System performance was found to depend significantly on operating conditions with optimum performance attained at 60 ºC and 100 % R.H. for both system sizes. To assist in the performance modeling of each system a differential chemical reactor model was used to determine H2 mass transport coefficients at each operating condition.
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