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Title: | Sinterability, microstructures and electrical properties of Ni/Gd-doped ceria cermets used as anode materials for SOFCs |
Authors: | Gil, Vanesa CSIC ORCID; Moure Jiménez, Carlos CSIC; Tartaj, Jesús CSIC | Keywords: | Powders-chemical preparation Sintering |
Issue Date: | 2007 | Publisher: | Elsevier | Citation: | Journal of the European Ceramic Society 27 (2007) 4205–4209 | Abstract: | The influence of Ni content in Ni–CGO cermets on their electrical conductivity was investigated in order to create the most suitable microstructure. Ni–CGO (50/50, 45/55 and 40/60 wt%) powder mixtures were prepared by the polymeric organic complex solution method using ethyleneglycol as a polymerized soluble alcohol in water. By heat treatment a composite of ultrafine nickel oxide homogeneously dispersed in the CGO ceramic matrix was attained. After sintering of NiO–CGO composites in air at 1350 ◦C for several times and reducing treatment in N2 90%–H2 10% atmosphere, the microstructures showed a uniform distribution of porous metallic Ni particles surrounded by microporous spaces with total porosity (closed and opened) of ≈20–25%. The electrical properties of Ni–CGO cermets sintered at 1350 ◦C for 2 h were studied using impedance spectroscopy in the temperature range from 500 to about 700 ◦C in argon atmosphere. The Ni–CGO cermets showed metallic behaviour over all the range at temperatures studied, indicating a uniform and fine-grained microstructure in which the Ni–Ni particle contacts were predominant. | Publisher version (URL): | http://dx.doi.org/doi:10.1016/j.jeurceramsoc.2007.02.119 | URI: | http://hdl.handle.net/10261/17744 | DOI: | 10.1016/j.jeurceramsoc.2007.02.119 |
Appears in Collections: | (ICV) Artículos |
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