The electrochemical quartz crystal microbalance (EQCM) technique was used to analyze the dissolution behavior of the Nafion
®-coated platinum electrode completely or partially immersed in an acidic media. A bare smooth Pt/QC electrode and the one coated with a 0.77 μm Nafion
® thin film were used as the working electrodes. The frequency changes in the Nafion
®-coated Pt/QC electrodes, which were partially immersed in 0.5 M H
2SO
4 at 298K, were similar to those of the completely immersed Pt/QC electrodes during potential sweeps. These results indicated that the frequency change in the Nafion
®-coated Pt/QC electrode was successfully applied to modeling and analyzing Pt dissolution at the actual PEFC cathode, and we called the new analytical method the “super-meniscus EQCM technique”.
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