Composite electrolytes for fuel cells: Long-term stability under variable atmosphere
authors Rondao, AIB; Patricia, SG; Figueiredo, FML; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Composite electrolytes; Impedance spectroscopy; Long-term stability; Fuel cells; Equivalent circuit
keywords PERCENT EUTECTIC MIXTURE; DOPED-CERIA; MOLTEN-CARBONATE; IMPEDANCE SPECTROSCOPY; ITSOFC APPLICATIONS; 973 K; PERFORMANCE; BEHAVIOR; DIOXIDE; OXIDE
abstract Ceria-based composites (50 vol% of the ceramic phase) including one mixture of Li and Na carbonates (1:1 molar ratio), were prepared using either pure ceria (modest conductor) or Gd-doped ceria (excellent oxide ion conductor) as ceramic matrix. These materials were aged for periods of up to 1000 h at 550 degrees C, under pure CO2, in air and in H-2 diluted in N-2, to test their stability and electrical performance. Impedance spectroscopy measurements performed between 300 and 600 degrees C were complemented by structural and microstructural characterization. The excellent long-term stability in CO2 drops slightly when moving to air and in a pronounced manner when moving to diluted H-2. In all cases and in all conditions the best performance is observed for pure ceria-based composites. Electrode (Au) and electrolyte degradation were found interrelated. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2014
volume 39
issue 10
beginning page 5460
ending page 5469
digital object identifier (doi) 10.1016/j.ijhydene.2013.12.125
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000334130800079
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journal impact factor 4.229
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