Understanding the cathodic polarisation behaviour of the misfit [Ca2CoO3-delta](q)[CoO2] (C349) as oxygen electrode for IT-SOFC

authors	Santos, JRD; Loureiro, FJA; Grilo, JPF; Silva, VD; Simoes, TA; Fagg, DP; Macedo, DA
nationality	International
journal	ELECTROCHIMICA ACTA
author keywords	Cathodic polarisation; [Ca2CoO3-delta](q)[CoO2]; Impedance spectroscopy; Proteic sol-gel synthesis; SOFC cathode
keywords	SOL-GEL SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; THERMOELECTRIC PROPERTIES; COMPOSITE CATHODES; COBALT OXIDE; CA-COBALTITE; O SYSTEM; TEMPERATURE; CALCINATION; KINETICS
abstract	Pure phase misfit Ca-cobaltite powder, [Ca2CoO3-delta](q)[CoO2] (C349), was successfully synthesised by the proteic sol-gel synthesis route and characterised by X-ray diffraction. The electrochemical performance of the C349 cathode screen-printed onto Ce0.9Gd0.1O1.95 (GDC) solid electrolyte was studied employing electrochemical impedance spectroscopy in 3-electrode cell configuration. Cathodic polarisation was evaluated in potentiostatic mode in the temperature range 550-700 degrees C. The C349 cathode prepared by proteic sol-gel synthesis route demonstrates lower polarisation resistances than similar misfit Ca-cobaltite compositions reported in the literature, produced by different synthetic approaches. A highly competitive performance of the formed C349 cathode is also highlighted upon comparison to typical SOFC cathodes under applied DC bias. (C) 2018 Elsevier Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0013-4686
year published	2018
volume	285
beginning page	214
ending page	220
digital object identifier (doi)	10.1016/j.electacta.2018.08.018
web of science category	Electrochemistry
subject category	Electrochemistry
unique article identifier	WOS:000445131700023