Proton uptake into the protonic cathode material BaCo^sub 0.4^Fe^sub 0.4^Zr^sub 0.2^O^sub 3-d^ and comparison to protonic electrolyte materials

Proton uptake in mixed-conducting cathode materials is of particular interest as it allows the oxygen reduction reaction to proceed via the bulk path in proton conducting ceramic fuel cells (PCFC). This work investigates the proton concentration of BaCo0.4 Fe0.4 Zr0.2 O3-d (BCFZr) and the predominan...

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Published in:Solid state ionics 2017-01, Vol.299, p.64
Main Authors: Zohourian, R, Merkle, R, Maier, J
Format: Article
Language:English
Subjects:
Basicity
Cathodes
Electrode materials
Electrolytic cells
Iron
Oxidation
Protons
Thermodynamics
Thermogravimetric analysis
Thermogravimetry
Valence
Zirconium
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Merkle, R
Maier, J
description Proton uptake in mixed-conducting cathode materials is of particular interest as it allows the oxygen reduction reaction to proceed via the bulk path in proton conducting ceramic fuel cells (PCFC). This work investigates the proton concentration of BaCo0.4 Fe0.4 Zr0.2 O3-d (BCFZr) and the predominant proton uptake reactions using thermogravimetry. Based on the obtained proton concentrations increasing from 0.5 mol% at 400 °C to 1.5 mol% at 200 °C, the bulk path is expected to be active for BCFZr. The variation of proton concentrations with the concentration of electronic defects indicates nonideal behavior with detrimental interactions between protons and (trapped) holes. The comparison of BCFZr with other materials emphasizes that several factors determine the proton concentration such as oxide ion basicity, B-site cations and their oxidation state and B-O covalency.
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source ScienceDirect Freedom Collection 2022-2024
subjects Basicity
Cathodes
Electrode materials
Electrolytic cells
Iron
Oxidation
Protons
Thermodynamics
Thermogravimetric analysis
Thermogravimetry
Valence
Zirconium
title Proton uptake into the protonic cathode material BaCo^sub 0.4^Fe^sub 0.4^Zr^sub 0.2^O^sub 3-d^ and comparison to protonic electrolyte materials
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