Degradation of La0.6Sr0.4CoO3-based cathode performance in solid oxide fuel cells due to the presence of aluminum oxide deposited through atomic layer deposition

Title
Degradation of La0.6Sr0.4CoO3-based cathode performance in solid oxide fuel cells due to the presence of aluminum oxide deposited through atomic layer deposition
Authors
Eui-Hyun KimHyo-Jun JungKi-Seok AnJeong-Yong ParkJun LeeIl-Doo HwangJae-Yuk KimMi-Jai LeeYongwoo KwonJin-Ha Hwang
Keywords
Degradation; Atomic layer deposition; Aluminum oxides; Impedance spectroscopy; Triplephase boundaries
Issue Date
2014-07
Publisher
Ceramics international
Citation
VOL 40, NO 6, 7817-7822
Abstract
Aluminum oxide was deposited into the porous cathode compartment of the (Sc,Al)-doped ZrO2 electrolyte cell through atomic layer deposition involving trimethyl aluminum and water as aluminum and oxygen sources, respectively. The deposited aluminum oxide had a detrimental effect on the cell performance of the zirconia-based SOFC unit cells in terms of the output power but did not change the open-cell voltage. Based on impedance spectroscopy, the open-cell voltage, and the output performance, the resultant degradation is attributed to the geometrical blockade of functional triple phase boundaries in La0.6Sr0.4CoO3 (LSCo)-based cathode materials of mixed ionic electronic conduction, indicating that there is a disruption at the interface between the charge collector and cathode that is proportional to the amount of deposited Al2O3.
URI
http://pubs.kist.re.kr/handle/201004/48496
ISSN
02728842
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KIST Publication > Article
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