resumo
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.
palavras-chave
LOW-TEMPERATURE SOFCS; FUEL-CELL SYSTEM; DOPED CERIA; ELECTRICAL-PROPERTIES; ANODE
categoria
Chemistry; Electrochemistry; Energy & Fuels
autores
Saradha, T; Fereira, AS; Patricio, SG; Figueiredo, FML; Marques, FMB
nossos autores
Fernando Manuel Bico Marques
Professor Catedrático
Filipe Miguel H Lebre R Figueiredo
Investigador Principal
Sónia Gonçalves Patrício
Investigador AuxiliarGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G5 - Materiais Biomiméticos, Biológicos e Vivos
Projectos
NANOCELL - Nanocomposite Electrolytes for Intermediate Temperature Fuel Cells (PTDC/CTM/098486/2008)
agradecimentos
Financial support from Project NANOCELL, PTDC/CTM/098486/2008, FCT/COMPETE/FEDER (Portugal), and Project NANOCOFC, NMP3-CT-2007-032308, CEC (Brussels) is greatly appreciated. Professor Mahmut D. Mat, from Nigde University (Turkey), kindly provided the CGO tapes.