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The PFSA(perfluorosulfonic acid)polymer content in the catalyst layer is an important parameter for obtaining a high performance PEFC(polymer electrolyte fuel cell). Nafion is a typical PFSA polymer. Several researchers have investigated it under various test conditions. P. Staiti et al. used 20 wt.%Pt/ C-0.5 mgPt/cm catalyst layers. Their catalyst layers are composed of catalyst particles bonded with PTFE and impregnated with Nafion dispersed liquid. The 20 wt.%Pt/C means a carbon supported Pt catalyst having Pt of 20 wt.% and carbon of 80 wt.%. The 0.5 mgPt/cm means loaded Pt weight of 0.5 mg per electrode area of 1 cm. Their optimum Nafion content was 47 wt.% at 200 mA/cm. J. Xie et al. used 20 wt.%PtCr/C-0.2 mgPt/cm catalyst layers manufactured by the Decal method, and their optimum Nafion content was 28 wt.% at 1-1.5 A/cm, 80 °C, 2.04 atm, at dewpoints of 105 °C(H2)/80 °C(air). Z. Qi et al. used 20 wt.%Pt/C-0.12 mgPt/cm catalyst layers applied onto the gas diffusion layer, and their optimum Nafion content was 30 wt.% at 600 mA/cm, 35 °C, 1 atm, at dewpoints of 45 °C (H2)/45 °C(air). A 50 wt.%Pt/C catalyst has recently been used instead of a 20 wt.%Pt/C catalyst. This paper reports the effects of the Nafion content in 50 wt.%Pt/C-1 mgPt/cm catalyst layers on the cell performance at 80 °C, 1 atm, under several humidified operating conditions. The amount of an optimal ionomer changes depending on various factors like the structural materials of the catalyst layer, the ingredient ratio of them, and the operating conditions of the cell, etc. It is now difficult to discuss which factors influence determination of the optimal ionomer. Therefore, we cannot discuss the source of the difference but only explain the result under the certain circumstances.This paper discussed the influence of the Nafion content in the catalyst layer of 50 wt.%Pt/C-1 mg/ cm into the cell performance under the conditions of 80 °C and 1 atm, and humidity as a parameter. These parameters were selected after consideration of recent trends of the cell structural material and test methods. It has been reported that the surface area per 1 g of Pt decreases with an increase of Pt wt.% in the catalyst. However, the increment of Pt wt.% is preferable for PEFC under high current density and high power density operation, because the catalyst layer becomes thin so that the gas easily pass through the layer. As shown in previous report, there were a few examples of experiments using 20 wt.%Pt/C catalyst layer in 1990s. The catalyst with 40-70 wt.%Pt/C was examined recently 6) and the 50 wt.%Pt/C catalyst has been widely used in the fuel cell application study by NEDO(New Energy and Industrial Technology Development Organization). However, this report may be the first report about an optimal ionomer content of 50 wt.%Pt/C catalyst.

Effect of PFSA Polymer Content in Catalyst Layer on PEFC Performance under Several Humidity Conditions