期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 695, 期 -, 页码 871-876出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.10.175
关键词
Solid oxide fuel cell; EDTA-citrate complexing method; Oxygen ion conductivity; Electrochemical impedance spectroscopy
In the present study, gadolinium doped ceria (Ce0.8Gd0.2O2-delta, GDC) electrolytes at different pH have been successfully prepared by EDTA-citrate complexing method for intermediate temperature solid oxide fuel cells (IT-SOFCs). XRD, Raman, FE-SEM, TEM and electrochemical impedance spectroscopy are used for structural and electrical characterizations. XRD patterns of the GDC powder calcined at 873 K for 5 h exhibits the cubic fluorite structure with space group Fm3m. Raman spectra of sintered GDC powder confirms the formation solid solution in corroboration with XRD data. FE-SEM images of sintered GDC pellets at different pH shows well defined grains separated from grain boundaries with good densification. Highest relative density (99%) is obtained for sintered GDC pellet with pH = 10. Electrical conductivity of GDC depends on pH of the solution and the maximum conductivity is 1.6 x 10(-2) S cm(-1) at 973 K with pH = 10. These preliminary results indicate the possible application of GDC as a potential electrolyte for IT-SOFCs. (C) 2016 Elsevier B.V. All rights reserved.
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