Abstract
A quantitative evaluation method of gas diffusion resistance is proposed in which measurement of V-I characteristics under constant fuel utilization (Uf) and ac impedance were combined to separate diffusion and electromotive force change contributions from the low frequency semi-circle observed in complex impedance diagrams. Diffusion resistance was evaluated using various hydrogen content mixture diluted with nitrogen, Uf , hydrogen flow rate and current as parameters. From the measurement under various Uf, it was found that the diffusion resistance at low Uf originates mainly from the diffusion of H2O. Also, from the measurement under various hydrogen concentration in inlet fuel, the diffusion resistance was found to become significantly large with decreasing hydrogen content.
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