Ceria-based electrolyte reinforced by sol-ge technique for intermediate-temperature solid oxide fuel cells

Title
Ceria-based electrolyte reinforced by sol-ge technique for intermediate-temperature solid oxide fuel cells
Authors
최윤겸박준영손지원이종호제해준김병국이해원윤경중
Keywords
Gadolinia-doped ceria; Electrolyte; Sol-gel; Impedance spectroscopy; Solid oxide fuel cell
Issue Date
2013-08
Publisher
International journal of hydrogen energy
Citation
VOL 38, NO 23, 9867-9872
Abstract
High performance solid oxide fuel cells (SOFCs) based on gadolinia-doped ceria (GDC) electrolyte are demonstrated for intermediate temperature operation. The inherent technical limitations of the GDC electrolyte in sinterability and mechanical properties are overcome by applying solegel coating technique to the screen-printed film. When the quality of the electrolyte film is enhanced by the additional sol-gel coating, the OCV and maximum power density increase from 0.73 to 0.90 V and from 0.55 to 0.95 W cm-2, respectively, at 650 ℃ with humidified hydrogen (3% H2O) as fuel and air as oxidant. The impedance analysis reveals that the reinforcement of the thin electrolyte with solegel coating significantly reduces the polarization resistance. Elementary reaction steps for the anode and cathode are analyzed based on the systematic impedance study, and the relation between the structural integrity of the electrolyte and the electrode polarization is discussed in detail.
URI
http://pubs.kist.re.kr/handle/201004/50181
ISSN
03603199
Appears in Collections:
KIST Publication > Article
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