Abstract
In order to reveal the electronic structure of (La,Sr)CoO3-d relevant to the chemistry in SOFC cathode, soft x-ray absorption and photoemission spectroscopy were employed. The lowest energy component in O K-edge XAS spectra of the La0.6Sr0.4CoO3-d is ascribed to the electron holes introduced by Sr-doping, and sensitively changes in intensity with oxygen nonstoichiometry. On the other hand, the Co2p XAS spectrum is insensitive to the oxidation state of the specimen. The increase in oxygen nonstoichiometry is accompanied with upward shift of the Fermi energy, while the binding energy of the Co2p level is almost unchanged. It is suggested that the relevant electron holes are rather associated with oxide ion rather than simple unoccupied state of cobalt ion.
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