TY - JOUR
T1 - Optimisation of the Solid Oxide Fuel Cell (SOFC) cathode material Ca 3Co4O9-δ
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
KW - Scanning electron microscopy
KW - Solid oxide fuel cell
UR - http://www.scopus.com/inward/record.url?scp=79958815880&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2011.02.030
DO - 10.1016/j.jpowsour.2011.02.030
M3 - Article
AN - SCOPUS:79958815880
SN - 0378-7753
VL - 196
SP - 7328
EP - 7332
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 17
ER -