Electrical Conductivity and Microstructure of NiO-CGO Composites Prepared by One-Step Synthesis
authors Macedo, DA; Figueiredo, FML; Patricio, SG; Nascimento, RM; Martinelli, AE; Paskocimas, CA; Marques, FMB
editors Leonte, OM; Mustain, WE
nationality International
journal NANOTECHNOLOGY (GENERAL) - 222ND ECS MEETING/PRIME 2012
keywords OXIDE FUEL-CELLS; ANODE MATERIALS; TRANSPORT; POWDERS
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).
publisher ELECTROCHEMICAL SOC INC
issn 1938-5862
isbn 978-1-60768-410-7
year published 2013
volume 50
issue 22
beginning page 21
ending page 31
digital object identifier (doi) 10.1149/05022.0021ecst
web of science category Electrochemistry; Nanoscience & Nanotechnology
subject category Electrochemistry; Science & Technology - Other Topics
unique article identifier WOS:000338026300004

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