Elaboration and Electrochemical Performances of Nanostructured Materials for Solid Oxide Fuel Cells

Author
Cyrine Brahim
Year
2006
Language of the thesis
French
Thesis name in original language
Conception et performances électrochimiques de matériaux nanostructurés pour piles à combustible à oxyde solide
Abstract & Cover

The reduction of the SOFC operating temperature causes several problems such as ohmic drop through the electrolyte and electrode overpotentials. To overcome these cell performance losses, the reduction of the electrolyte resistivity is necessary. This can be achieved by lowering the thickness of the electrolyte. Therefore, thin layers of CGO and overlayers of YSZ have been deposited separately or together in a bilayer system by Atomic Layer Deposition (ALD) and DC reactive magnetron sputtering on porous and dense substrates. The Chemical Bath Deposition (CBD) of CGO has also been studied as a cheaper deposition technique. Several techniques (SEM, X-Ray diffraction, EDX) have been used to characterize the physico-chemical properties of the thin layers. Their electrical properties have been studied by impedance spectroscopy and the difficulty of such measurements on ultrathin layers has been underlined. These physico-chemical and electrical characterizations allowed us to highlight and compare the leading characteristics of these elaboration techniques and to show the influence of the choice of the deposition technique on the electrical behaviour of the thin layers. Finally, a preliminary study on the ALD elaboration and the physico-chemical and  

University
Chimie ParisTech
(Paris, France)
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