Abstract
The degradation of the solid oxide fuel cell cathode material with respect to the oxygen exchange kinetics in - and -containing atmospheres has been investigated at . The material exhibits excellent stability in dry atmosphere over 1000 h. No appreciable degradation has been observed after exposure to a -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 -degraded sample. It is concluded that the degradation mechanism involves hydroxides as intermediate species even if the predominant species in the degraded surface is .
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