Electrochemical intercalation of oxygen in some oxide lattices
- Laboratoire de Chimie du Solide du CNRS, Talence (France)
Electrochemical intercalation of oxygen has been achieved at room temperature, in KOH solution and under anodic polarisation. The starting materials are oxide ceramics of {approximately} 80% compacity. Mossbauer spectroscopy of {sup 57}Fe has demonstrated the bulk character of the process. For the La{sub 2}NiO{sub 4} oxides, intercalation occurs, as previously described, inside the La{sub 2}O{sub 2} layer. For high rate of intercalation, oxygen species seem to be O associate in polyoxide O{sub 3}{sup 5{minus}} anions. They are ordered along the [111] direction of the tetragonal cell. In the NiO{sub 2} plane, a charge density wave occurs by electron transfer from planar to apical orbitals, inducing semiconducting behavior. The electronic configuration 3d{sup 9} of Cu{sup 2+} does not allow such transfer and induces a metallic behavior.
- OSTI ID:
- 141105
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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