New synthesis of nanopowders of proton conducting materials. A route to densified proton ceramics

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.12.020· OSTI ID:21370339

Khani, Zohreh; Taillades-Jacquin, Melanie; Taillades, Gilles ^[1]; Marrony, Mathieu ^[2]; Roziere, Jacques ^[1]

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1. Institut Charles Gerhardt Montpellier, UMR 5253, Laboratoire des Agregats, Interfaces et Materiaux pour l'Energie, Universite Montpellier II, 34095 Montpellier (France)
2. European Institute for Energy Research, Emmy-Noether Strasse 11, 76131 Karlsruhe (Germany)

Low temperature routes have been developed for the preparation of BaCe{sub 0.9}Y{sub 0.1}O{sub 2.95} (BCY10) and BaZr{sub 0.9}Y{sub 0.1}O{sub 2.95} (BZY10) in the form of nanoparticulate powders for use after densification as ceramic membranes for a proton ceramic fuel cell. These methods make use on the one hand of the chelation of metal (II), (III) and (IV) ions by acrylates (hydrogelation route) and on the other of the destabilisation and precipitation of micro-emulsions. Both routes lead to single phase yttrium doped barium cerate or zirconate perovskites, as observed by X-ray diffraction, after thermal treatment at 900 deg. C for 4 h for BCY10 and 800 deg. C for BZY10. These temperatures, lower than those usually used for preparation of barium cerate or zirconate, lead to oxide nanoparticles of size <40 nm. Dense ceramics (>=95%) are obtained by sintering BCY10 pellets at 1350 deg. C and BZY10 pellets at 1500 deg. C for 10 h. The water uptake of compacted samples at 500 deg. C is 0.14 wt% for BCY10 and 0.26 wt% for BZY10. Total conductivities in the range 300-600 deg. C were determined using impedance spectroscopy in a humidified nitrogen atmosphere. The total conductivity was 1.8x10{sup -2} S/cm for BCY10 and 2x10{sup -3} S/cm for BZY10 at 600 deg. C. The smallest perovskite nanoparticles and highest conductivities were obtained by hydrogelation of precursor barium, zirconium, cerium and yttrium acrylates. - Graphical Abstract: Low temperature hydrogelation and micro-emulsion routes have been developed for the preparation of rare earth doped barium and zirconium cerates in the form of nanoparticulate powders for use after densification as ceramic membranes for a proton ceramic fuel cell.

• OSTI ID: 21370339
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CERAMICS
CERIUM COMPOUNDS
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTROCHEMICAL CELLS
FUEL CELLS
MATERIALS
NANOSTRUCTURES
OXYGEN COMPOUNDS
PROTON EXCHANGE MEMBRANE FUEL CELLS
RARE EARTH COMPOUNDS
SOLID ELECTROLYTE FUEL CELLS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONATES
ZIRCONIUM COMPOUNDS