XPS study of surface state of novel perovskite system Dy{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.2}O{sub 3-δ} as cathode for solid oxide fuel cells
- Depatment of Physics, Rashtrasant Tukadoji Maharaj Nagpur University Campus, Nagpur-440033 (India)
- UGC-DAE Consortium for scientific Research, University Campus, Khandwa Road, Indore-452001, Madhya Pradesh,India (India)
In the present attempt,novel perovskite oxide Dy{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.2}O{sub 3–δ} (DSCF) as cathode material has been synthesized by an Ethylene glycol-citrate combined sol-gel combustion route. Orthorhombic symmetry structure is confirmed by X-ray diffraction (XRD) and data is well fitted using Rietveld refinement by Full-Prof software suite. Chemical natureof surface of DSCF has been analyzed by using X-ray photoelectron spectroscopy (XPS). XPS result shows that Dy ions are in +3 oxidation state and Sr in +2 states. However Co2p and Fe2p spectra indicates partial change in oxidation state from Co3+/Fe3+ to Co4+/Fe4+. These attribute to develop active sites on the surface for oxygen ions. O1s XPS spectra shows two oxygen peaks relatedto lattice oxygen in perovskite and absorbed oxygen in oxygen vacancy are detected. O1s spectra demonstrate the existence of adsorbed oxygen species on the surface of DSCF oxide which is quite beneficial for intermediate temperature of Solid Oxide Fuel Cell.
- OSTI ID:
- 22591257
- Journal Information:
- AIP Conference Proceedings, Vol. 1728, Issue 1; Conference: ICC 2015: International conference on condensed matter and applied physics, Bikaner (India), 30-31 Oct 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATHODES
CITRATES
COBALT COMPOUNDS
COMBUSTION
DYSPROSIUM COMPOUNDS
DYSPROSIUM IONS
ELECTRON SPECTRA
FERRATES
GLYCOLS
ORTHORHOMBIC LATTICES
OXYGEN IONS
PEROVSKITE
SOL-GEL PROCESS
SOLID OXIDE FUEL CELLS
STRONTIUM COMPOUNDS
SURFACES
VACANCIES
VALENCE
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY