Effects of Carbon Dioxide on the Performance of Anion-Exchange Membrane Fuel Cells

The effects of CO sub(2) on the performance of an anion-exchange membrane fuel cell were investigated using a three-electrode single cell equipped with a reference electrode. Though the membrane resistance decreased at high current densities in the presence of CO sub(2) via the self-purging mechanis...

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Published inDenki kagaku oyobi kōgyō butsuri kagaku Vol. 79; no. 5; pp. 322 - 325
Main Authors Inaba, M, Matsui, Y, Saito, M, Tasaka, A, Fukuta, K, Watanabe, S, Yanagi, H
Format Journal Article
LanguageJapanese
Published 01.05.2011
Subjects
Anodes
Carbon dioxide
Density
Electrodes
Fuel cells
Low currents
Membranes
Voltage
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Summary:The effects of CO sub(2) on the performance of an anion-exchange membrane fuel cell were investigated using a three-electrode single cell equipped with a reference electrode. Though the membrane resistance decreased at high current densities in the presence of CO sub(2) via the self-purging mechanism, the cell voltage was significantly lower than that for pure O sub(2) especially at low current densities even at a very low CO sub(2) concentration of 100 ppm. The overpotential at the cathode was hardly changed by the presence of CO sub(2), while that at the anode significantly increased in the presence of CO sub(2). It was concluded that carbonate/bicarbonate ions accumulated at the anode during operation, and reduces the ionic conductivity and the pH in the anode catalyst layer, which results in a high overpotential at the anode.
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ISSN:1344-3542
DOI:10.5796/electrochemistry.79.322