Abstract
A new method based on hydrogen pump is presented to measure the electro-osmotic drag coefficient and proton conductivity in Nafion ® 117 membrane under similar condition to operating PEMFC. For membranes in contact with liquid water on both sides, electro-osmotic drag coefficient and proton conductivity increase with increasing temperature over the range of 20–90 °C while keeping water content inside the membrane constant ( λ = 22.5) and decrease with decreasing water content in the membrane while keeping temperature of system constant ( T = 25 °C). On the basis of cluster-network model and transport mechanisms of proton and water in ionomeric membrane, the results are discussed.
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