THERMAL SCIENCE

International Scientific Journal

A HIERARCHICAL HYBRID ELECTRODE FOR RAPID OXYGEN REDUCTION REACTION BELOW 800°C

ABSTRACT
The 3-D backbones with ionic conductivity are first built by sintering Ce0.8Sm0.2O1.9 silks, then Ca3Co2O6 nanoparticles as electrocatalyst are filled in by infiltrating ionic solution, as a result, a hybrid electrode with hierarchical structure is constructed as the cathode of solid oxide fuel cells. Compared with the single-phase Ca3Co2O6 bulk cathode and common Ca3Co2O6-Ce0.8Sm0.2O1.9 composite one, this hybrid electrode is very active for oxygen reduction reaction. At 800°C, area specific resistance with this cathode is reduced to 0.062 Ωcm2, and power density peak with the electrolyte-supported single-cell is promoted to 760 mW/cm2. The superior catalytical activity is attributed to the enlarged area for surface oxygen exchange kinetics and enhanced ionic transport behaviour.
KEYWORDS
PAPER SUBMITTED: 2019-04-24
PAPER REVISED: 2019-09-29
PAPER ACCEPTED: 2019-09-29
PUBLISHED ONLINE: 2020-06-21
DOI REFERENCE: https://doi.org/10.2298/TSCI2004455L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE 4, PAGES [2455 - 2462]
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© 2020 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence