Influence of the indium concentration on microstructural and electrical properties of proton conducting NiO-BaCe(0.9-x)In(x)Y(0.1)O(3- delta ) cermet anodes for IT-SOFC application

Optimization of the major properties of anodes based on proton conductors, such as microstructure, conductivity and chemical stability, is yet to be achieved. In this study we investigated the influence of indium on the chemical stability, microstructural and electrical characteristics of proton con...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-06, Vol.563, p.254-260
Main Authors: Zunic, Milan, Brankovic, Goran, Foschini, Cesar Renato, Cilense, Mario, Longo, Elson, Varela, Jose Arana
Format: Article
Language:English
Subjects:
Anodes
Corrosion resistance
Electrical properties
Indium
Microstructure
Nickel
Pellets
Resistivity
Online Access:Get full text
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Summary:Optimization of the major properties of anodes based on proton conductors, such as microstructure, conductivity and chemical stability, is yet to be achieved. In this study we investigated the influence of indium on the chemical stability, microstructural and electrical characteristics of proton conducting NiO-BaCe(0.9-x)In(x)Y(0.1)O(3- delta ) (NiO-BCIYx) anodes. Four compositions of cermet anode substrates NiO-BCIYx were prepared using the method of evaporation and decomposition of solutions and suspensions (EDSS). Sintered anode substrates were reduced and their microstructural and electrical properties were examined before and after reduction as a function of the amount of indium. Anode substrates tested on chemical stability in the CO(2) atmosphere showed high stability compared to anode substrates based on commonly used doped barium cerates. Microstructural properties of the anode pellets before and after testing in CO(2) were investigated using X-ray diffraction analysis. Impedance spectroscopy measurements were used for evaluation of electrical properties of the anode pellets and the conductivity values of reduced anodes of more than 14 S cm(-1) at 600 degree C confirmed percolations through Ni particles. Under fuel cell operating conditions, the cell with a Ni-BCIY20 anode achieved the highest performance, demonstrating a peak power density 223 mW/cm(2) at 700 degree C confirming the functionality of Ni-BCIY anodes.
ISSN:0925-8388