Abstract
Water management in proton exchange membrane fuel cells (PEMFCs) is critical. Although water flooding has been extensively studied, all measurements that have been reported so far only involve the water removal accumulated at the gas flow channels of a bipolar plate. There are few reports that aimed to overcome water flooding happening in the pores of a porous electrode so far. This study is thus devoted to solve the water flooding happening in the pores of a porous electrode by using an antiflooding electrode (AFE) which contains water-proof oil, dimethyl silicon oil (DMS). The success of the AFE in antiflooding is due to the following: (1) DMS, in which the solubility of oxygen is over 10 times higher than that in water, supplies an unoccupied channel for oxygen transportation, (2) it solves the flooding in pores with a diameter of 20−70 nm, in which flooding often happens and is not easily eliminated by conventional means, and (3) the flooding to the porous electrode itself rather than the gas channels...
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