Abstract
The so-called bubbling and weeping effects observed with porous semihydrophobic fuel cell electrodes are discussed in terms of gas transport in porous media. It is shown that the bubbling of gas on the electrolyte side can be accounted for by transport equations valid in the intermediate region between ordinary and Knudsen diffusion. The anomalous transport of liquid toward the gas side is attributed to isothermal distillation proceeding in the electrode pores. A gradient of the partial pressure of water vapour in the pores is the principal cause for both effects.
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