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Moran-Ruiz A.,University of the Basque Country | Vidal K.,University of the Basque Country | Larranaga A.,University of the Basque Country | Arriortua M.I.,University of the Basque Country | Arriortua M.I.,aterials Basque Center for Materials
Fuel Cells | Year: 2016

Interconnect-cathode interfacial adhesion is important for the durability of solid oxide fuel cell (SOFC). Thus, the use of a conductive contact layer between interconnect and cathode could reduce the cell area specific resistance (ASR). The use of La0.6Sr0.4FeO3 (LSF) cathode, LaNi0.6Fe0.4O3– δ (LNF) contact layer and Crofer22APU interconnect was proposed as an alternative cathode side. LNF-LSF powder mixtures were heated at 800 °C for 1,000 h and at 1,050 °C for 2 h and analyzed by X-Ray power diffraction (XRD). The results indicated a low reactivity between the materials. The degradation occurring between the components of the half-cell (LSF/LNF/Crofer22APU) was studied. XRD results indicated the formation of secondary phases, mainly: SrCrO4, A(B, Cr)O3 (A = La, Sr; B = Ni, Fe) and SrFe12O19. Scanning electron microscopy with energy dispersive X-Ray spectroscopy (SEM-EDX) and the X-Ray photoelectron spectroscopy (XPS) analyzes confirmed the interaction between LSF/LNF and the metallic interconnect due to the Cr vaporization/migration. An increment of the resistance of ∼0.007 Ω cm2 in 1,000 h is observed for (LSF/LNF/Crofer22APU) sample. However, the ASR values of the cell without contact coating, (LSF/Crofer22APU), were higher (0.31(1) Ω cm2) than those of the system with LNF coated interconnect (0.054(7) Ω cm2), which makes the proposed materials combination interesting for SOFC. Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Source


De Luis R.F.,University of the Basque Country | De Luis R.F.,aterials Basque Center for Materials | Orive J.,University of the Basque Country | Larrea E.S.,University of the Basque Country | And 3 more authors.
CrystEngComm | Year: 2014

The hybrid vanadates exhibit structural archetypes between the hybrid zeotypes, in which the inorganic framework is surrounding an organic cation acting as a template, and metal-organic frameworks whose crystal structures are constructed from metal nodes or clusters linked by organic bridges. Here we present the summary of the studies carried out on hybrid vanadates constructed from extended metal-organic arrays. The crystal structures are systematically described and classified according to the dimensionality of the inorganic and metal-organic frameworks. Finally, the magnetic, thermal and catalytic properties of different structural archetypes are discussed. This journal is © the Partner Organisations 2014. Source


Moran-Ruiz A.,University of the Basque Country | Vidal K.,University of the Basque Country | Larranaga A.,University of the Basque Country | Porras-Vazquez J.M.,University of Birmingham | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2015

An uncoated and MnCo1.9Fe0.1O4 (MCF) coated Fe-22Cr meshes were dipped into LaNi0.6Fe0.4O3-δ (LNF) slurry to form a continuous protective/conductive layer for Crofer22APU interconnect. After aged these samples at 800 °C for 1000 h, energy dispersive X-ray (EDX) results concluded that: if The deposition of The protective coating was not enough to form a dense and continuous layer across The width of The mesh, then The use of MCF spinel layer is not enough to prevent chromium migration. For mesh-LNF/interconnect structure The area specific resistance (ASR) value of 0.0425(2) Ω cm2 was stable for 400 min at 800 °C, indicating initial good adherence between both materials. After aged this structure at 800 °C for 1000 h, without applying a current source, X-ray micro-diffraction (XRMD) results, performed at The rib and channel of The interconnect, revealed that The LNF material is acting as a protective layer. Moreover, X-ray photoelectron spectroscopy (XPS) analysis indicated that manganese is concentrated on The mesh/LNF contact surface. © 2015 Hydrogen Energy Publications, LLC. Source

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