Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7722382 | International Journal of Hydrogen Energy | 2013 | 9 Pages |
Abstract
The effect of Pt loading on the performance of proton exchange membrane fuel cells with atmospheric air feed was evaluated at various relative humidities. The membrane electrode assemblies (MEAs) were fabricated by decal methods with high Nafion ionomer content (30 and 40Â wt.%). When the Pt loading was decreased, the performance of the MEAs with an ionomer content of 30Â wt.% gradually decreased, mainly due to the insufficient active Pt surfaces with low proton conductivity. With a higher ionomer content of 40Â wt.%, the activation overpotential was not significantly increased by the decrease in Pt loading, and the concentration overpotential could be largely reduced by decreasing the Pt loading to 0.25Â mg/cm2. When the Pt loading was further decreased to 0.15Â mg/cm2, even though the flooding became more severe, the cell performance at 0.6Â V and intermediate relative humidity of 55% was about 71.6%, compared to the MEA with a high Pt loading of 0.35Â mg/cm2 (ionomer content: 30Â wt.%). The cell performance could be further enhanced by decreasing the ionomer content in the anode to enhance the water back diffusion.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Sang Hyun Ahn, Sunyeol Jeon, Hee-Young Park, Soo-Kil Kim, Hyoung-Juhn Kim, EunAe Cho, Dirk Henkensmeier, Sung Jong Yoo, Suk Woo Nam, Tae-Hoon Lim, Jong Hyun Jang,