S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Dependence of the performance of a high-temperature polymer electrolyte fuel cell on phosphoric acid-doped polybenzimidazole ionomer content in cathode catalyst layer
- Kim, Jeong-Hi; Kim, Hyoung-Juhn; Lim, Tae-Hoon; Lee, Ho-In
- Issue Date
- Journal of Power Sources 170 (2007) 275–280
- High-temperature polymer electrolyte fuel cell; Ionomer content; Membrane electrolyte assembly; Phosphoric acid-doped polybenzimidazole; Cathode catalyst; Potential loss
- Phosphoric acid-doped polybenzimidazole is used as a fuel cell membrane and an ionomer in the catalyst layer of a high-temperature polymer
electrolyte fuel cell. Single-cell tests are performed to find the optimum ionomer content in the cathode catalyst layer. To determine the effects
of the ionomer in the catalyst layer, the potential loss in the cell is separated into activation, ohmic and concentration losses. Each of these losses
is examined by means of impedance and morphological analyses. With the weight ratio of ionomer to Pt/C of 1:4 (20 wt.% ionomer in catalyst
layer), the fuel cell shows the lowest ohmic resistance. The activation loss in the fuel cell is lowest when the ratio is 1:9 (10 wt.% ionomer in the
catalyst layer). The cell performance is dependent on this ratio, and the best cell performance is obtained with a ratio of 1:4.
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