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http://hdl.handle.net/10773/20725
Title: | Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared by One-Step Synthesis |
Author: | Macedo, D. A. Figueiredo, F. M. L. Patricio, S. G. Nascimento, R. M. Martinelli, A. E. Paskocimas, C. A. Marques, F. M. B. |
Keywords: | OXIDE FUEL-CELLS ANODE MATERIALS TRANSPORT POWDERS |
Issue Date: | 2013 |
Publisher: | ELECTROCHEMICAL SOC INC |
Abstract: | The correlation between the microstructure and electrical properties of NiO-Ce0.9Gd0.1O1.95 (NiO-CGO) composites prepared by a one-step synthesis method is reported in the present work, and compared to conventional samples synthesized by mechanically mixing commercial powders. Samples sintered between 1350 and 1450 degrees C had their microstructures and electrical properties investigated by scanning electron microscopy (SEM) and impedance spectroscopy. The total electrical conductivity in the range of 100 -500 degrees C of one-step composites is more than one order of magnitude higher than for conventional material. This result is associated to the presence of a network of well-connected and homogeneously distributed NiO grains shown by SEM for the one-step composite, which is responsible for its improved percolative behavior and lower activation energy (0.24 eV at 250 - 650 degrees C). |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20725 |
DOI: | 10.1149/05022.0021ecst |
ISBN: | 978-1-60768-410-7 |
ISSN: | 1938-5862 |
Publisher Version: | 10.1149/05022.0021ecst |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared By One-Step Synthesis_10.114905022.0021ecst.pdf | 1.82 MB | Adobe PDF |
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