Cellulose-precursor synthesis of nanocrystalline Ce0.8Gd0.2O2-delta for SOFC anodes
authors Tsipis, EV; Kharton, VV; Bashmakov, IA; Naumovich, EN; Frade, JR
nationality International
journal JOURNAL OF SOLID STATE ELECTROCHEMISTRY
author keywords cellulose-precursor synthesis; cermet; electrode polarization; nanocrystalline ceria; solid oxide fuel cell anode
keywords OXIDE FUEL-CELLS; PR-DOPED CE(GD)O2-DELTA; ELECTROCHEMICAL PROPERTIES; CERAMIC MICROSTRUCTURE; IONIC-CONDUCTIVITY; CERIA; ELECTROLYTE; PERFORMANCE; CONDUCTORS; TRANSPORT
abstract Developments of intermediate-temperature solid oxide fuel cells (IT SOFCs) require novel anode materials with a high electrochemical activity at 800-1070 K. The polarization of cermet anodes, made of nickel, ceria and yttria-stabilized zirconia (YSZ) and applied onto a YSZ solid electrolyte, can be significantly reduced by catalytically active ceria additions, the relative role of which increases with decreasing temperature. Further improvement is observed when using Ce0.8Gd0.2O2-delta (CGO) having a high oxygen ionic conductivity instead of undoped ceria, owing to enlargement of the electrochemical reaction zone. Nanocrystalline CGO powders with grain sizes of 8-35 nm were thus synthesized via the cellulose-precursor technique and introduced into Ni-CGO-YSZ cermets, and tested in contact with a (La0.9Sr0.1)(0.98)Ga0.8Mg0.2O3-delta (LSGM) electrolyte at 873-1073 K. The results showed that the anode performance can be enhanced by additional surface activation, in particular by impregnation with a Ce-containing solution, and also by incorporation of YSZ, which probably acts as a cermet-stabilizing component. The overpotential of the surface-modified Ni-CGO (25 wt%-75 wt%) anode in a 10% H-2/90% N-2 atmosphere was approximately 110 mV at 1073 K with a current density of 200 mA/cm(2).
publisher SPRINGER
issn 1432-8488
year published 2004
volume 8
issue 9
beginning page 674
ending page 680
digital object identifier (doi) 10.1007/s10008-004-0507-z
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000223022400017
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