Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 33, Pages 16433-16438Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp2029642
Keywords
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Funding
- New Energy and Industrial Technology Development Organization (NEDO) in Japan
- Grants-in-Aid for Scientific Research [22360286, 22350007] Funding Source: KAKEN
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The electronic structural changes of La0.6Sr0.4CoO3-delta cathodes with oxygen vacancy formation by reducing oxygen partial pressures, p(O-2)'s were investigated in detail using X-ray absorption spectroscopy to understand metallic-like electronic conduction mechanism. The oxygen nonstoichiometry of La0.6Sr0.4CoO3-delta was controlled by annealing the samples under various p(O-2)'s and quenched to room temperature. Co K-edge X-ray absorption near edge structure (XANES) spectra revealed that the Co average valence decreased with decreasing p(O-2), which was also confirmed by iodometric titration. The Co L-edge XANES spectra were hardly changed with changing p(O-2)'s. Meanwhile, the peak area of the O K-edge XANES spectra strongly depended on p(O-2). This result revealed the strong hybridization between the O 2p and Co 3d states. It was conduded the introduction of oxygen vacancies narrowed the hybridized orbital of O 2p and Co 3d states, resulted in a decrease in the mobility as well as the concentration of electron holes with decreasing p(O-2).
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