A novel polytetrafluoroethylene (PTFE)-reinforced multilayer self-humidifying composite membrane is developed. The membrane is composed of Nafion-impregnated porous PTFE composite as the central layer and nanosized Si O 2 supported Pt catalyst imbedded into Nafion as the two side layers. The proton exchange membrane (PEM) fuel cells employing the self-humidifying membrane ( 20 μ m thick) under dry H 2 ∕ O 2 gave a peak power density of 0.95 W ∕ cm 2 and an open-circuit voltage of 1.032 V . The good membrane performance is attributed to hygroscopic Pt ‐ Si O 2 catalyst at the two side layers, which results in enhanced anode side self-humidification function and decreased cathode polarization.
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Zhu et al. (2006) studied this question.
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