Performance of homogeneous and layered ceria/carbonate composite electrolytes
authors Saradha, T; Fereira, AS; Patricio, SG; Figueiredo, FML; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Nanocomposite; Electrolyte; Fuel cell; Microstructure
keywords LOW-TEMPERATURE SOFCS; FUEL-CELL SYSTEM; DOPED CERIA; ELECTRICAL-PROPERTIES; ANODE
abstract Multilayer ceramic and salt composite cells were prepared superimposing up to seven alternate layers of Ce0.9Gd0.1O1.95 (CGO) and mixtures of Na2CO3 (NC) and Li2CO3 (LC), with final sintering around 500 degrees C. Various other single component cells (CGO or NC + LC) and homogeneous composites (consisting of intimate mixtures of ceramics and salts) were prepared and used as reference. All these materials were characterized by X-ray diffraction, scanning electronic microscopy and impedance spectroscopy, in air. The layered cells electrical performance was studied both as series or parallel associations to try to inspect the specific electrical performance of the ceramic/salt interface. The multilayer cells resistance showed a close agreement with prediction based on classical series or parallel association models, and no sign of special contributions originated in the ceramic/salt interface. However, the electrode impedance appeared quite distinct for the various types of cells under analysis (single component, homogeneous and layered composites). This indeed suggests that interfaces play a role on the overall cell performance. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2012
volume 37
issue 8
beginning page 7235
ending page 7241
digital object identifier (doi) 10.1016/j.ijhydene.2011.11.013
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000303952300097

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