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Title: Fabrication of Sr- and Co-doped lanthanum chromite interconnectors for SOFC

Abstract

Graphical abstract: FESEM micrographs of the fresh fracture surfaces for the La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3} sintered specimens cast from optimised suspensions with 13.5, 15 and 17.5 vol.% solids loading. Aqueous suspensions were prepared using ammonium polyacrylate (PAA) as dispersant and tetramethylammonium hydroxide (TMAH) to assure a basic pH and providing stabilization. Sintering of the green discs was performed in air at 1600 {sup o}C for 4 h. Highlights: {yields} Optimum casting slips were achieved with 3 wt.% of ammonium polyacrylate and 1 wt.% of tetramethylammonium hydroxide. -- Abstract: Many studies have been performed dealing with the processing conditions of electrodes and electrolytes in solid oxide fuel cells (SOFCs). However, the processing of the interconnector material has received less attention. Lanthanum chromite (LaCrO{sub 3}) is probably the most studied material as SOFCs interconnector. This paper deals with the rheology and casting behaviour of lanthanum chromite based materials to produce interconnectors for SOFCs. A powder with the composition La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3} was obtained by combustion synthesis. Aqueous suspensions were prepared to solids loading ranging from 8 to 17.5 vol.%, using ammonium polyacrylate (PAA) as dispersant and tetramethylammonium hydroxide (TMAH) to assure a basic pH and providing stabilization.more » The influence of the additives concentrations and suspension ball milling time were studied. Suspensions prepared with 24 h ball milling, with 3 wt.% and 1 wt.% of PAA and TMAH, respectively, yielded the best conditions for successful slip casting. Sintering of the green discs was performed in air at 1600 {sup o}C for 4 h leading to relatively dense materials.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [4]
  1. Departamento de Engenharia de Materiais, Universidade Federal de Sao Carlos - DEMa/UFSCar (Brazil)
  2. (Brazil)
  3. Departamento de Quimica Inorganica, Cristalografia y Mineralogia, Universidad de Malaga, 29071 Malaga (Spain)
  4. Instituto de Ceramica y Vidrio, ICV (CSIC), 28049 Madrid (Spain)
  5. Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN (Brazil)
Publication Date:
OSTI Identifier:
22212196
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 46; Journal Issue: 7; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DOPED MATERIALS; ELECTRODES; ELECTROLYTES; MICROSTRUCTURE; MILLING; OXIDES; POWDERS; SINTERING; SLIP CASTING; SOLID OXIDE FUEL CELLS; SOLIDS; STABILIZATION; SURFACES; SUSPENSIONS; SYNTHESIS; X-RAY DIFFRACTION

Citation Formats

Setz, L.F.G., Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN, Santacruz, I., Colomer, M.T., E-mail: tcolomer@icv.csic.es, Mello-Castanho, S.R.H., and Moreno, R. Fabrication of Sr- and Co-doped lanthanum chromite interconnectors for SOFC. United States: N. p., 2011. Web. doi:10.1016/J.MATERRESBULL.2011.03.019.
Setz, L.F.G., Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN, Santacruz, I., Colomer, M.T., E-mail: tcolomer@icv.csic.es, Mello-Castanho, S.R.H., & Moreno, R. Fabrication of Sr- and Co-doped lanthanum chromite interconnectors for SOFC. United States. doi:10.1016/J.MATERRESBULL.2011.03.019.
Setz, L.F.G., Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN, Santacruz, I., Colomer, M.T., E-mail: tcolomer@icv.csic.es, Mello-Castanho, S.R.H., and Moreno, R. Fri . "Fabrication of Sr- and Co-doped lanthanum chromite interconnectors for SOFC". United States. doi:10.1016/J.MATERRESBULL.2011.03.019.
@article{osti_22212196,
title = {Fabrication of Sr- and Co-doped lanthanum chromite interconnectors for SOFC},
author = {Setz, L.F.G. and Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN and Santacruz, I. and Colomer, M.T., E-mail: tcolomer@icv.csic.es and Mello-Castanho, S.R.H. and Moreno, R.},
abstractNote = {Graphical abstract: FESEM micrographs of the fresh fracture surfaces for the La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3} sintered specimens cast from optimised suspensions with 13.5, 15 and 17.5 vol.% solids loading. Aqueous suspensions were prepared using ammonium polyacrylate (PAA) as dispersant and tetramethylammonium hydroxide (TMAH) to assure a basic pH and providing stabilization. Sintering of the green discs was performed in air at 1600 {sup o}C for 4 h. Highlights: {yields} Optimum casting slips were achieved with 3 wt.% of ammonium polyacrylate and 1 wt.% of tetramethylammonium hydroxide. -- Abstract: Many studies have been performed dealing with the processing conditions of electrodes and electrolytes in solid oxide fuel cells (SOFCs). However, the processing of the interconnector material has received less attention. Lanthanum chromite (LaCrO{sub 3}) is probably the most studied material as SOFCs interconnector. This paper deals with the rheology and casting behaviour of lanthanum chromite based materials to produce interconnectors for SOFCs. A powder with the composition La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3} was obtained by combustion synthesis. Aqueous suspensions were prepared to solids loading ranging from 8 to 17.5 vol.%, using ammonium polyacrylate (PAA) as dispersant and tetramethylammonium hydroxide (TMAH) to assure a basic pH and providing stabilization. The influence of the additives concentrations and suspension ball milling time were studied. Suspensions prepared with 24 h ball milling, with 3 wt.% and 1 wt.% of PAA and TMAH, respectively, yielded the best conditions for successful slip casting. Sintering of the green discs was performed in air at 1600 {sup o}C for 4 h leading to relatively dense materials.},
doi = {10.1016/J.MATERRESBULL.2011.03.019},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 7,
volume = 46,
place = {United States},
year = {2011},
month = {7}
}