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Impedance spectroscopy: a method for in situ characterization of experimental fuel cells

✍ Scribed by W. Jenseit; O. Böhme; F.U. Leidich; H. Wendt

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
596 KB
Volume
38
Category
Article
ISSN
0013-4686

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✦ Synopsis

Ahstraet-The combination of measurements of current-voltage curves and impedance spectroscopic data of fuel cell electrodes helps to understand the influence of electrode morphology on effective electrccatalytic hehaviour of electrodes for alkaline and molten carbonate fuel cells. PTFEbonded Pt-activated carbon electrodes and their ageing hehaviour were investigated showing that the degree of pore4ooding changes with time and that slow poisoning deteriorates the catalyst over several 100h. PTFE-bonded Raney-nickel anodes are shown to be only partially utilized. A drastic change of the morphology of Ni-sponge anodes and NiO-cathodes in molten carbonate fuel cells is shown to be mainly due to improved porosity and electrolyte wetting of both electrodes.

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