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Electrochemical Behaviour of Ce0.9Gd0.1O2−δ SOFC-Anodes

✍ Scribed by A. O. Störmer; P. Holtappels; H. Y. Tu; U. Stimming

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
416 KB
Volume
33
Category
Article
ISSN
0933-5137

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✦ Synopsis

In order to compare the electrochemical performance of Ce 0.9 Gd 0.1 O 2Àd (CGO) in various fuels, impedance spectroscopy measurements were carried out in the atmospheres containing H 2 , CO, CO 2 , CH 4 , N 2 at various compositions, in the temperature range 650 8C to 850 8C. Ohmic loss and polarization resistance were derived from impedance spectroscopy measurements. The stability at different temperatures of the anode was also investigated in 9%H 2 /91%N 2 humidified with 3% H 2 O. The microstructure of the anode before and after degradation test was analysed by SEM. These investigations indicated similarities in the impedance and the activation enthalpies in hydrogen/water, methane/water and CO/CO 2 atmospheres. No indications of methane cracking leading to carbon formation were found.

Durch impedanzspektroskopische Messungen wurde ein Vergleich des elektrochemischen Verhaltens von Ce 0.9 Gd 0.1 O 2Àd (CGO) in verschiedenen Brenngasatmospha Èren bei Temperaturen zwischen 650 8C und 850 8C durchgefu Èhrt. Die untersuchten Brenngase enthielten unterschiedliche Anteile an H 2 , CO, CO 2 , CH 4 und N 2 . Der Ohmsche Verlust und der Polarisations-Widerstand wurden aus den Impedanzmessungen bestimmt. Die elektrochemische Stabilita Èt der Anode

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