abstract
Solid oxide electrochemical cells are promising devices for energy conversion and chemical synthesis. In this respect, one of the main challenges to improving cell performance is the decrease in the polarisation resistance (R-p) of the oxygen electrodes. Here, the electrochemical properties of composite electrodes of Ba2Co9O14/Ce0.8Gd0.2O2-delta (BCO/CGO) are investigated by electrochemical impedance spectroscopy at 600-800 degrees C. The composite with 50 vol% CGO exhibits the lowest polarisation resistance, 0.3 Omega cm(2) at 600 degrees C in O-2. The comparatively superior performance results from an increased triple-phase boundary (TPB) length due to the increased percolation of both phases. This successful result presents a high -performing oxygen electrode for solid oxide electrochemical systems. (C) 2022 Elsevier B.V. All rights reserved.
keywords
FUEL-CELL; ELECTRICAL-CONDUCTIVITY; DOPED CERIA; ELECTROCHEMICAL PERFORMANCE; TRANSPORT-PROPERTIES; CATHODE; LA2NIO4+DELTA; MICROSTRUCTURE; PERMEABILITY; PEROVSKITE
subject category
Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
authors
Araujo, AJM; Loureiro, FJA; Grilo, JPF; Macedo, DA; Paskocimas, CA; Fagg, DP
our authors
Francisco José Almeida Loureiro
Research Fellowship
João Grilo
Junior Researcheracknowledgements
This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) - Finance Code 001. Allan J. M. Araujo acknowledges the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq/Brazil, reference number 200439/2019-7) . Joao P. F. Grilo, Carlos A. Paskocimas and Daniel A. Macedo also thank CNPq/Brazil (482473/2010-0, 446126/2014-4, 308548/2014-0, 307236/2018-8, 431428/2018-2, and 309430/2019-4) . The Aveiro team acknowledges pro-jects PTDC/CTM-CTM/2156/2020, PTDC/QUI-ELT/3681/2020, POCI-01-0145-FEDER-032241, UID/EMS/00481/2019-FCT, CENTRO-01-0145-FEDER-022083, funded by FEDER, Centro Portugal Regional Operational Programme (Centro2020) , under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) and by national funds (OE) , through FCT/MCTES. Francisco J. A. Loureiro acknowledges FCT for the financial support with the reference CEECIND/02797/2020.