Novel Fabrication of Ca-Doped LaNbO4 Thin-Film Proton-Conducting Fuel Cells by Pulsed Laser Deposition

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Thin films of 0.5% Ca-doped La0.995Ca0.005NbO4− (LCNO) proton-conducting electrolytes of ∼2 m thickness were obtained by pulsed laser deposition on NiO–LaNbO4 composite substrates. The morphology of the films was granular after annealing at T≤1000°C and evolved to spherical-like grains at 1100°C and above. The structure and composition of the films were characterized by X-ray diffraction and X-ray photoelectron spectrocopy. LCNO films showed the monoclinic fergusonite-type structure at room temperature. The area-specific resistance for a ∼2-m-thick electrolyte was in the order of 0.4 Ω·cm2 at 600°C based on estimates of the electrode area. Temperature dependency of the electrical conductivity at 600°–700°C was comparable with that of bulk disks of the material.

Document Type: Research Article


Affiliations: 1: Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, NO-0349 Oslo, Norway 2: CMEM Department, DIOPMA Centre, Chemistry Faculty, University of Barcelona, Barcelona, Spain 3: Department of Applied Physics and Optics and Institute of Nanoscience and Nanotechnology, University of Barcelona, Barcelona, Spain 4: Structural Physics Group, Department of Physics, University of Oslo, NO-0316 Oslo, Norway

Publication date: July 1, 2010

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