Lanthanum strontium manganite/yttria-stabilized zirconia nanocomposites derived from a surfactant assisted, co-assembled mesoporous phase

Mamak, M., Métraux, G.S., Petrov, S., Coombs, N., Ozin, G.A., Green, M.A. (2003) Lanthanum strontium manganite/yttria-stabilized zirconia nanocomposites derived from a surfactant assisted, co-assembled mesoporous phase. Journal of the American Chemical Society, 125 (17). pp. 5161-5175. ISSN 0002-7863. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

A one-pot, soft-chemistry, surfactant-assisted co-assembly approach to prepare La1-xSrxMnO3 (LSM)/Y2O3-stabilized ZrO2 (YSZ) nanocomposites for use as solid oxide fuel cell (SOFC) cathodes has been investigated. This material with sub-hundred nanometer grain sizes for each phase is the first such nanocomposite where aqueous-based precursors of each component are incorporated in a single synthetic step. This approach utilizes the co-assembly of an anionic yttrium/zirconium acetatoglycolate gel, cetyltrimethylammonium bromide as the cationic surfactant template, and inorganic La, Mn, and Sr salts under alkaline aqueous conditions. The resulting as-synthesized product is an amorphous mesostructured organic/inorganic composite, which is transformed to a mesoporous inorganic oxide with nanocrystalline YSZ walls upon calcination. Calcination to temperatures above 600°C lead to collapse of the mesopores followed by further crystallization of the nanocrystalline YSZ phase and a final crystallization of the LSM perovskite phase above 1000°C. Both the fully crystalline LSM/YSZ and the mesoporous intermediate phase have been investigated for phase homogeneity by TEM energy-dispersive X-ray spectroscopy (EDX) mapping and spot analysis which confirm the dispersion of LSM within a YSZ matrix at the nanometer scale. Impedance spectroscopy analysis of LSM/YSZ nanocomposite electrodes demonstrate a low polarization resistance of around 0.2 Ω cm2 with an activation energy (Ea) as low as 1.42 eV. Cathodic polarization studies show stable current densities over a 40 h test demonstration.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Am. Chem. Soc. [Field not mapped to EPrints] C2 - 12708868 [Field not mapped to EPrints] AD - Materials Chemistry Research Group, Chemistry Department, University of Toronto, 80 St. George St., Toronto, Ont. M5S 3H6, Canada [Field not mapped to EPrints] AD - Davy Faraday Research Laboratory, Royal Institution of Great Britain, 21 Albemarle Street, London, WIX 4BS, United Kingdom [Field not mapped to EPrints] AD - Department of Chemistry, University College London, 20 Gordon Street, London, WCIH OAJ, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Activation energy, Calcination, Cathodes, Energy dispersive spectroscopy, Gels, Grain size and shape, Nanostructured materials, Negative ions, Polarization, Solid oxide fuel cells, Surface active agents, Synthesis (chemical), Transmission electron microscopy, Zirconia, Phase homogeneity, Lanthanum compounds, lanthanum, manganese oxide, metal oxide, nanoparticle, strontium, surfactant, yttrium, zirconium oxide, adsorption, article, controlled study, crystallization, desorption, electrochemistry, energy, energy dispersive X ray spectroscopy, fuel cell, roentgen spectroscopy, solid oxide fuel cell, synthesis, transmission electron microscopy, X ray powder diffraction
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 21 Oct 2015 15:22 UTC
Last Modified: 29 May 2019 16:11 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51134 (The current URI for this page, for reference purposes)
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