Optimisation of the Solid Oxide Fuel Cell (SOFC) cathode material Ca 3Co4O9-δ

Aurélie Rolle; Samir Boulfrad; Kensaku Nagasawa; Hiroshi Nakatsugawa; Olivier Mentré; John Irvine; Sylvie Daviero-Minaud

doi:10.1016/j.jpowsour.2011.02.030

Optimisation of the Solid Oxide Fuel Cell (SOFC) cathode material Ca ₃Co₄O_9-δ

Aurélie Rolle^*, Samir Boulfrad, Kensaku Nagasawa, Hiroshi Nakatsugawa, Olivier Mentré, John Irvine, Sylvie Daviero-Minaud

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

This paper focuses on the electrochemical potentialities of the 2D misfit compound Ca₃Co₄O_9-δ, so far mainly investigated for its thermoelectric properties. Its expansion coefficient (TEC = (9-10) × 10^-6 °C^-1) and its chemical stability are compatible with standard CGO IT-electrolyte and the first optimisation steps of the deposited cathode have been performed with the aim to minimise the ASR and increase the cell durability. Particular attention has been paid on the effect of thickness and microstructure for pure and composite cathodes. The electrode reaction was performed on symmetrical cells. The preliminary results presented here show that the composite (70 wt.% Ca₃Co ₄O_9-δ-30 wt.% CGO) gives the lowest ASR values compare to single-phased electrodes. Strikingly, the ASR values increase for thinner deposited layers. The effect of various current collectors (gold grid vs. platinum paste) has been also checked.

Original language	English (US)
Pages (from-to)	7328-7332
Number of pages	5
Journal	Journal of Power Sources
Volume	196
Issue number	17
DOIs	https://doi.org/10.1016/j.jpowsour.2011.02.030
State	Published - Sep 1 2011

Keywords

Cathode
Electrochemical impedance spectroscopy
Mixed ionic electronic conductor
Scanning electron microscopy
Solid oxide fuel cell

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2011.02.030

Cite this

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title = "Optimisation of the Solid Oxide Fuel Cell (SOFC) cathode material Ca 3Co4O9-δ ",

abstract = "This paper focuses on the electrochemical potentialities of the 2D misfit compound Ca3Co4O9-δ, so far mainly investigated for its thermoelectric properties. Its expansion coefficient (TEC = (9-10) × 10-6 °C-1) and its chemical stability are compatible with standard CGO IT-electrolyte and the first optimisation steps of the deposited cathode have been performed with the aim to minimise the ASR and increase the cell durability. Particular attention has been paid on the effect of thickness and microstructure for pure and composite cathodes. The electrode reaction was performed on symmetrical cells. The preliminary results presented here show that the composite (70 wt.% Ca3Co 4O9-δ-30 wt.% CGO) gives the lowest ASR values compare to single-phased electrodes. Strikingly, the ASR values increase for thinner deposited layers. The effect of various current collectors (gold grid vs. platinum paste) has been also checked.",

keywords = "Cathode, Electrochemical impedance spectroscopy, Mixed ionic electronic conductor, Scanning electron microscopy, Solid oxide fuel cell",

author = "Aur{\'e}lie Rolle and Samir Boulfrad and Kensaku Nagasawa and Hiroshi Nakatsugawa and Olivier Mentr{\'e} and John Irvine and Sylvie Daviero-Minaud",

year = "2011",

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AU - Rolle, Aurélie

AU - Boulfrad, Samir

AU - Nagasawa, Kensaku

AU - Nakatsugawa, Hiroshi

AU - Mentré, Olivier

AU - Irvine, John

AU - Daviero-Minaud, Sylvie

PY - 2011/9/1

Y1 - 2011/9/1

N2 - This paper focuses on the electrochemical potentialities of the 2D misfit compound Ca3Co4O9-δ, so far mainly investigated for its thermoelectric properties. Its expansion coefficient (TEC = (9-10) × 10-6 °C-1) and its chemical stability are compatible with standard CGO IT-electrolyte and the first optimisation steps of the deposited cathode have been performed with the aim to minimise the ASR and increase the cell durability. Particular attention has been paid on the effect of thickness and microstructure for pure and composite cathodes. The electrode reaction was performed on symmetrical cells. The preliminary results presented here show that the composite (70 wt.% Ca3Co 4O9-δ-30 wt.% CGO) gives the lowest ASR values compare to single-phased electrodes. Strikingly, the ASR values increase for thinner deposited layers. The effect of various current collectors (gold grid vs. platinum paste) has been also checked.

AB - This paper focuses on the electrochemical potentialities of the 2D misfit compound Ca3Co4O9-δ, so far mainly investigated for its thermoelectric properties. Its expansion coefficient (TEC = (9-10) × 10-6 °C-1) and its chemical stability are compatible with standard CGO IT-electrolyte and the first optimisation steps of the deposited cathode have been performed with the aim to minimise the ASR and increase the cell durability. Particular attention has been paid on the effect of thickness and microstructure for pure and composite cathodes. The electrode reaction was performed on symmetrical cells. The preliminary results presented here show that the composite (70 wt.% Ca3Co 4O9-δ-30 wt.% CGO) gives the lowest ASR values compare to single-phased electrodes. Strikingly, the ASR values increase for thinner deposited layers. The effect of various current collectors (gold grid vs. platinum paste) has been also checked.

KW - Cathode

KW - Electrochemical impedance spectroscopy

KW - Mixed ionic electronic conductor

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