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Development and operation of a 150 W air-feed direct methanol fuel cell stack |
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| Authors: | D Buttin M Dupont M Straumann R Gille J-C Dubois R Ornelas GP Fleba E Ramunni V Antonucci AS Aricò P Cretì E Modica M Pham-Thi J-P Ganne |
| Affiliation: | (1) Sodeteg, 25, rue du Pont des Halles, Chevilly-Larue, 94666 Rungis Cedex, France;(2) De Nora Fuel Cells, Via Bistolfi 35, 20134 Milan, Italy;(3) De Nora, Via Bistolfi 35, 20134 Milan, Italy;(4) CNR–TAE Institute for Transformation and Storage of Energy, Salita S. Lucia sopra Contesse 39, 98126 S. Lucia, Messina, Italy;(5) Thomson–CSF/LCR, Domaine de Corbeville, 91404 Orsay, France |
| Abstract: | A five-cell 150 W air-feed direct methanol fuel cell (DMFC) stack was demonstrated. The DMFC cells employed Nafion 117® as a solid polymer electrolyte membrane and high surface area carbon supported Pt-Ru and Pt catalysts for methanol electrooxidation and oxygen reduction, respectively. Stainless steel-based stack housing and bipolar plates were utilized. Electrodes with a 225 cm2 geometrical area were manufactured by a doctor-blade technique. An average power density of about 140 mW cm–2 was obtained at 110 °C in the presence of 1 M methanol and 3 atm air feed. A small area graphite single cell (5 cm2) based on the same membrane electrode assembly (MEA) gave a power density of 180 mW cm–2 under similar operating conditions. This difference is ascribed to the larger internal resistance of the stack and to non-homogeneous reactant distribution. A small loss of performance was observed at high current densities after one month of discontinuous stack operation. |
| Keywords: | direct methanol fuel cells fuel cell stack fuel cell performance Pt catalysts Nafion 117® |
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