☆ 4.6 Article

Long-Term Oxygen Exchange Kinetics of Nd(2)NiO(4+delta) in H(2)O- and CO(2)-Containing Atmospheres

JOURNAL OF THE ELECTROCHEMICAL SOCIETY (2010)

期刊

JOURNAL OF THE ELECTROCHEMICAL SOCIETY

卷 157, 期 11, 页码 B1537-B1541

出版社

ELECTROCHEMICAL SOC INC

DOI: 10.1149/1.3481420

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Electrochemistry Materials Science, Coatings & Films

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EC [SOFC600, 020089]

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The degradation of the solid oxide fuel cell cathode material Nd(2)NiO(4+delta) with respect to the oxygen exchange kinetics in H(2)O- and CO(2)-containing atmospheres has been investigated at 700 degrees C. The material exhibits excellent stability in dry Ar + 1% O(2) atmosphere over 1000 h. No appreciable degradation has been observed after exposure to a CO(2)-rich atmosphere, but a decrease in the chemical surface exchange coefficient of oxygen by 1 order of magnitude has been found after 1000 h under moist conditions (30% relative humidity). Post-test X-ray photoelectron spectroscopy depth analysis showed significant changes in the Nd:Ni cation ratio within the topmost 100 nm of the H(2)O-degraded sample. It is concluded that the degradation mechanism involves hydroxides as intermediate species even if the predominant species in the degraded surface is NdNiO(3). (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3481420] All rights reserved.

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