Intrinsic and extrinsic compositional effects in ceria/carbonate composite electrolytes for fuel cells
authors Ferreira, ASV; Soares, CMC; Figueiredo, FMHLR; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Fuel cell; Ceria; Alkaline carbonate; Mechanosynthesis; Humidity; Ionic conductivity
keywords LOW-TEMPERATURE SOFCS; GAS SHIFT REACTION; DOPED CERIA; NANOCRYSTALLINE CERIA; ELECTRICAL-PROPERTIES; ITSOFC APPLICATIONS; CONDUCTIVITY; MICROSTRUCTURE; CONDUCTORS; ATMOSPHERE
abstract Composite ionic conductors for fuel cells were produced by combination of one ceria-based ceramic electrolyte and various mixtures of Na and Li carbonates, using several processing routes. These materials were characterized by impedance spectroscopy, scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy with attenuated total reflectance. The chemical composition of the mixed carbonates and the processing route were influential in the development of impressive conductivity levels (close to 0.1 S/cm) at modest temperatures (below 600 degrees C), suggesting a complex role of chemical composition (Na/Li ratio), phase composition (solid/liquid ratio), processing route (mechanothermal history) and microstructure. Furthermore, exposure to humidity showed formation of OH groups. Such hydrogenated species are believed to increase the complexity of the global surface processes and charge transport mechanisms where several native and foreign species may play a significant role. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2011
volume 36
issue 5
beginning page 3704
ending page 3711
digital object identifier (doi) 10.1016/j.ijhydene.2010.12.025
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000288833600051
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journal impact factor 4.229
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