Composite electrodes for ceria-carbonate intermediate temperature electrolytes

authors	Pereira, JRS; Rajesh, S; Figueiredo, FML; Marques, FMB
nationality	International
journal	ELECTROCHIMICA ACTA
author keywords	Composite electrodes; Ceria-based composite electrolytes; Electrode microstructure; Chemical stability; Intermediate temperature fuel cells; Electrode performance
keywords	OXIDE FUEL-CELLS; ELECTRICAL-PROPERTIES; CATHODES; POLARIZATION; PERFORMANCE; LICOO2
abstract	Composite electrodes based on several ceramic oxides were tested for their chemical compatibility and electrochemical performance in systems based on composite Gd-doped ceria + alkaline carbonate electrolytes. Reactivity tests performed at 700 degrees C (accelerated testing conditions), involving the ceramic electrode materials and one mixture of Na and Li carbonates, identified two promising perovskyte-type ceramics, LaCoO3 and La0.8Sr0.2Co0.2Fe0.8O3, as the most stable. Co-pressed and co-sintered cell assemblies (electrode/electrolyte/electrode) involving composite electrodes (perovskytes mixed with alkaline carbonates)were studied in detail by scanning electron microscopy and tested by impedance spectroscopy in air in the temperature range 300-600 degrees C. These tests showed the potential of these composite electrodes for intermediate temperature applications, clearly surpassing in performance standard Au electrodes, here used as reference. (c) 2012 Elsevier Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0013-4686
year published	2013
volume	90
beginning page	71
ending page	79
digital object identifier (doi)	10.1016/j.electacta.2012.12.035
web of science category	Electrochemistry
subject category	Electrochemistry
unique article identifier	WOS:000316037600009