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.
keywords
SOL-GEL SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; THERMOELECTRIC PROPERTIES; COMPOSITE CATHODES; COBALT OXIDE; CA-COBALTITE; O SYSTEM; TEMPERATURE; CALCINATION; KINETICS
subject category
Electrochemistry
authors
Santos, JRD; Loureiro, FJA; Grilo, JPF; Silva, VD; Simoes, TA; Fagg, DP; Macedo, DA
our authors
João Grilo
Junior Researcheracknowledgements
The authors acknowledge CNPq (Brazil, 447797/2014-0 and 311883/2016-8) and the Foundation for Science and Technology Portugal, FCT, project grant PTDC CTM-ENE/6319/2014, UID/CTM/50011/2013 e CENTRO-01-0145-FEDER-022083, IF/01344/2014/CP1222/CT0001, QREN, FEDER and COMPETE Portugal and the European Union for the financial support. Jakeline R. D. Santos thanks