Electrochemical estimation of GBCO(GdBaCo2O5+delta)/GDC(Gd2O3-doped CeO2) cathode composites designed for intermediate-temperature solid oxide electrochemical cells
- Authors
- Ko, Myeong-Hee; Yoo, Young-Sung; Hwang, Jin-Ha
- Issue Date
- Apr-2015
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Double perovskite; GdBaCo2O5+delta; Impedance spectroscopy; Electrochemical polarization
- Citation
- CERAMICS INTERNATIONAL, v.41, no.3, pp.4616 - 4620
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 41
- Number
- 3
- Start Page
- 4616
- End Page
- 4620
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/10064
- DOI
- 10.1016/j.ceramint.2014.12.005
- ISSN
- 0272-8842
- Abstract
- Double (or layered) perovskite GdBaCo2O5+delta (GBCO) was synthesized via a glycin nitrate process. This mixed ionic-electronic GBCO was composited to ionic GDC conductors as a cathode system for intermediate-temperature solid oxide fuel cells. The electrochemical features of these GBCO/GDC cathodes were investigated via frequency-dependent impedance spectroscopy with a geometric restriction at the cathode/electrolyte interface. Compared to the pure GBCO system, the GBCO/GDC composites exhibited a gradual increase in their electrochemical polarization. The optimized composition was determined to be 75 wt%:25 wt% GBCO:GDC. The larger GBCO fraction is believed to exhibit high mixed ionic-electronic conduction due to the oxygen vacancies in its crystal structure, found in the [Gd-O] layers. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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Collections - College of Engineering > Materials Science and Engineering Major > 1. Journal Articles
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