A platinum thin film electrode was fabricated on the surface of SiO 2 nanofibers by atomic layer deposition (ALD) and its cell performances were analyzed with an MEA using it as the cathode to reveal general features of platinum thin film electrodes. Although the Pt/SiO 2 cell showed comparable performance to the conventional Pt/C cell under suitable condition in spite of the much smaller electrochemical surface area (ECSA), it showed poor performance under overly dry or wet conditions as is the case with the 3M's nanostructured thin film (NSTF) electrode. An analysis applying a transmission line model of the electrode to the Pt/SiO 2 nanofiber electrode indicated that the performance loss of the Pt/SiO 2 electrode under dry condition is mainly due to the increase in the reaction resistance rather than that in the ohmic resistance. The increment in the reaction resistance was suppressed by addition of ionomer to the Pt/SiO 2 electrode. Furthermore, performance loss under wet condition due to cathode flooding was drastically alleviated by addition of a hydrophobic polymer to the Pt/SiO 2 electrode.
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Inaba et al. (2015) studied this question.
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