Details
| Original language | English |
|---|---|
| Pages (from-to) | 26266-26279 |
| Number of pages | 14 |
| Journal | Journal of Materials Chemistry A |
| Volume | 12 |
| Issue number | 38 |
| Early online date | 11 Sept 2024 |
| Publication status | Published - 2024 |
Abstract
Current research in oxygen electrodes for Solid Oxide Fuel Cell applications underscores that the commercialization process of this technology remains severely limited by the poor oxygen reduction reaction performance of cathode materials. The misfit calcium cobalt oxide [Ca2CoO3−δ]0.62[CoO2] (CCO) presents a promising prospect in this regard, boasting fast surface-exchange kinetics coupled to a thermal expansion coefficient closely aligned with that of standard electrolytes. Nevertheless, its polarization losses are limited by a poor bulk oxygen-ion conduction, which confines the oxygen diffusion to a surface pathway, where the microstructure plays a significant role. Therefore, this study explores an alternative processing route for the synthesis of CCO via the electrospinning technique, resulting in a microstructure composed of small platelet-like grains with increased surface area, as well as enhanced grain-to-grain connectivity. Our work comprehensively assesses the particular benefits of electrospinning, where both the fiber breakage during the electrode preparation and the higher aspect ratio of the synthesized particles play a key role in the final electrode microstructure. This modification significantly enhances the electrochemical processes of the CCO electrode prepared by this route, resulting in a reduction of the total polarization resistance between 60% and 69% in the temperature range (800 to 600) °C, compared to a sample produced by the state-of-the-art solid-state reaction. Overall, our work highlights electrospinning as a promising alternative methodology for fabricating CCO cathodes with superior electrochemical performance.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- General Materials Science
Sustainable Development Goals
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In: Journal of Materials Chemistry A, Vol. 12, No. 38, 2024, p. 26266-26279.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Optimization of misfit calcium cobaltite oxygen electrodes for solid oxide fuel cells through electrospinning processing
AU - Araújo, Allan J.M.
AU - Maor, Itzhak I.
AU - Holz, Laura I.V.
AU - Mann-Lahav, Meirav
AU - Beilin, Vadim
AU - Feldhoff, Armin
AU - Grader, Gideon S.
AU - Loureiro, Francisco J.A.
N1 - Publisher Copyright: © 2024 The Royal Society of Chemistry.
PY - 2024
Y1 - 2024
N2 - Current research in oxygen electrodes for Solid Oxide Fuel Cell applications underscores that the commercialization process of this technology remains severely limited by the poor oxygen reduction reaction performance of cathode materials. The misfit calcium cobalt oxide [Ca2CoO3−δ]0.62[CoO2] (CCO) presents a promising prospect in this regard, boasting fast surface-exchange kinetics coupled to a thermal expansion coefficient closely aligned with that of standard electrolytes. Nevertheless, its polarization losses are limited by a poor bulk oxygen-ion conduction, which confines the oxygen diffusion to a surface pathway, where the microstructure plays a significant role. Therefore, this study explores an alternative processing route for the synthesis of CCO via the electrospinning technique, resulting in a microstructure composed of small platelet-like grains with increased surface area, as well as enhanced grain-to-grain connectivity. Our work comprehensively assesses the particular benefits of electrospinning, where both the fiber breakage during the electrode preparation and the higher aspect ratio of the synthesized particles play a key role in the final electrode microstructure. This modification significantly enhances the electrochemical processes of the CCO electrode prepared by this route, resulting in a reduction of the total polarization resistance between 60% and 69% in the temperature range (800 to 600) °C, compared to a sample produced by the state-of-the-art solid-state reaction. Overall, our work highlights electrospinning as a promising alternative methodology for fabricating CCO cathodes with superior electrochemical performance.
AB - Current research in oxygen electrodes for Solid Oxide Fuel Cell applications underscores that the commercialization process of this technology remains severely limited by the poor oxygen reduction reaction performance of cathode materials. The misfit calcium cobalt oxide [Ca2CoO3−δ]0.62[CoO2] (CCO) presents a promising prospect in this regard, boasting fast surface-exchange kinetics coupled to a thermal expansion coefficient closely aligned with that of standard electrolytes. Nevertheless, its polarization losses are limited by a poor bulk oxygen-ion conduction, which confines the oxygen diffusion to a surface pathway, where the microstructure plays a significant role. Therefore, this study explores an alternative processing route for the synthesis of CCO via the electrospinning technique, resulting in a microstructure composed of small platelet-like grains with increased surface area, as well as enhanced grain-to-grain connectivity. Our work comprehensively assesses the particular benefits of electrospinning, where both the fiber breakage during the electrode preparation and the higher aspect ratio of the synthesized particles play a key role in the final electrode microstructure. This modification significantly enhances the electrochemical processes of the CCO electrode prepared by this route, resulting in a reduction of the total polarization resistance between 60% and 69% in the temperature range (800 to 600) °C, compared to a sample produced by the state-of-the-art solid-state reaction. Overall, our work highlights electrospinning as a promising alternative methodology for fabricating CCO cathodes with superior electrochemical performance.
UR - http://www.scopus.com/inward/record.url?scp=85204113658&partnerID=8YFLogxK
U2 - 10.1039/d4ta04085f
DO - 10.1039/d4ta04085f
M3 - Article
AN - SCOPUS:85204113658
VL - 12
SP - 26266
EP - 26279
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 38
ER -