TY - JOUR

T1 - High Performance Cathodes for Solid Oxide Fuel Cells Prepared by Infiltration of La0.6Sr0.4CoO32d into Gd-Doped Ceria

A1 - Samson,Alfred Junio

A1 - Søgaard,Martin

A1 - Knibbe,Ruth

A1 - Bonanos,Nikolaos

AU - Samson,Alfred Junio

AU - Søgaard,Martin

AU - Knibbe,Ruth

AU - Bonanos,Nikolaos

PB - Electrochemical Society, Inc.

PY - 2011

Y1 - 2011

N2 - Cathodes prepared by infiltration of La0.6Sr0.4CoO3d (LSC40) into a porous Ce0.9Gd0.1O1.95 (CGO10) backbone have been developed for low temperature solid oxide fuel cells. The CGO10 backbone has been prepared by screen printing a CGO10 ink on both sides of a 180 m dense CGO10 electrolyte-tape followed by firing. LSC40 was introduced into the CGO10 porous backbone by multiple infiltrations of aqueous nitrate solutions followed by firing at 350C. A systematic study of the performance of the cathodes was performed by varying the CGO10 backbone firing temperature, the LSC40 firing temperature and the number of infiltrations. The cathode polarization resistance was measured using electrochemical impedance spectroscopy on symmetrical cells in ambient air, while the resulting structures were characterized by scanning electron microscopy (SEM) and high temperature X-ray diffraction (HT-XRD). The firing temperature of 600C for the LSC40 infiltrate was found to provide a balance between LSC40 material formation and high surface area micro=nanostructure. The lowest polarization resistances measured at 600 and 400C were 0.044 and 2.3 X cm2 in air, respectively. During degradation tests at 600C, the cathode polarization resistance levels out after about 450 h of testing, giving a final polarization resistance of 0.07 X cm2. copyright 2011 The Electrochemical Society.

AB - Cathodes prepared by infiltration of La0.6Sr0.4CoO3d (LSC40) into a porous Ce0.9Gd0.1O1.95 (CGO10) backbone have been developed for low temperature solid oxide fuel cells. The CGO10 backbone has been prepared by screen printing a CGO10 ink on both sides of a 180 m dense CGO10 electrolyte-tape followed by firing. LSC40 was introduced into the CGO10 porous backbone by multiple infiltrations of aqueous nitrate solutions followed by firing at 350C. A systematic study of the performance of the cathodes was performed by varying the CGO10 backbone firing temperature, the LSC40 firing temperature and the number of infiltrations. The cathode polarization resistance was measured using electrochemical impedance spectroscopy on symmetrical cells in ambient air, while the resulting structures were characterized by scanning electron microscopy (SEM) and high temperature X-ray diffraction (HT-XRD). The firing temperature of 600C for the LSC40 infiltrate was found to provide a balance between LSC40 material formation and high surface area micro=nanostructure. The lowest polarization resistances measured at 600 and 400C were 0.044 and 2.3 X cm2 in air, respectively. During degradation tests at 600C, the cathode polarization resistance levels out after about 450 h of testing, giving a final polarization resistance of 0.07 X cm2. copyright 2011 The Electrochemical Society.

KW - Solid Oxide Fuel Cells

U2 - 10.1149/1.3571249

DO - 10.1149/1.3571249

JO - Electrochemical Society. Journal

JF - Electrochemical Society. Journal

SN - 0013-4651

IS - 6

VL - 158

SP - B650-B659

ER -