Journal Article

FZJ-2013-03627

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Degradation of a High Performance SOFC Cathode by Cr-Poisoning at OCV-Conditions

Kornely, M. (Corresponding author) ; Menzler, N. H. ; Weber, A. ; Ivers-Tiffée, E.

2013
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/fuce.201200182

Abstract: In this work we investigate the effect of Cr-poisoning at OCV-condition by means of electrochemical impedance spectroscopy (EIS). The anode-supported cell (ASC) is operated in Cr-free environment for the first 70 h of the cell test at 800 °C supplying air to the cathode and a varying mixture of H2O/H2 to the anode. The performance of the cell is determined by current-voltage (CV) measurement after the start up. After an operating time of 70 h in the absence of chromium species a Cr-source was switched on by passing the oxidant (air) through a Crofer22APU powder bed. In order to determine the degradation caused by Cr-poisoning electrical impedance spectra are collected at every 29 h of operating time. After further 275 h at OCV-condition in the presence of Cr-source another CV-curve is measured. A detailed analysis of the measured impedance spectra by the distribution of relaxation times (DRT) enables a separation of the cathode polarization resistance. During the Cr-free operation the cathode polarization shows a constant value. After the Cr-source is switched on a strong increase of the cathode polarization resistance is observed. This unique result shows clearly that Cr-poisoning of an LSM/8YSZ-cathode already takes place at OCV-condition.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 123 - Fuel Cells (POF2-123) (POF2-123)
2. SOFC - Solid Oxide Fuel Cell (SOFC-20140602) (SOFC-20140602)

Appears in the scientific report 2013

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Database coverage:
Current Contents - Social and Behavioral Sciences ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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