XPS study of titanium species exposed to molten Li2CO3-Na2CO3 in the anodic conditions used in molten carbonate fuel cells


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Abstract

The surface characterization of titanium, titanium oxide and lithium titanate samples exposed to molten Li2CO3-Na2CO3, in the anodic conditions used in molten carbonate fuel cells, was carried out by X-ray Photoelectron Spectroscopy (XPS). Different elements were identified: Ti(IV), O(-II), Li(I) and Na(I). The amounts of adsorbed sodium and lithium carbonates, as well as inserted lithium were estimated by a semi-quantitative XPS analysis in layers of about 50 Å. A broadening of the Ti 2p3/2 peak was observed. This effect is probably caused by a distorsion of the Li2TiO3 lattice due to the incorporation of lithium within this structure. Li2TiO3 compound was detected by X-ray diffraction (XRD) on Ti, TiO2 as well as Li2TiO3 after treatment in the molten carbonate eutectic.

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