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The performances of PEFCs operated at low humidity have been greatly improved by the use of catalyst layers containing SiO2 particles (SiO2–CLs). The highest performance was obtained in a cell with SiO2–CLs for both the anode and the cathode, i.e., at 0.7 V, 30% RH, and 80 °C, the current density was 2.7 times larger than that without SiO2. It was found that the use of the SiO2–CLs increased the water content, resulting in the reduction of the ohmic resistance and the enhanced effectiveness of the Pt catalyst. The promotion of the back-diffusion of generated water from the cathode to the SiO2-containing anode certainly contributed to the improvement of the cathode performance. Keywords: Fuel cell, SiO2, Catalyst layer, PEFC |
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