2024-03-29T10:15:03Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1485802020-05-25T10:03:25Zcom_10261_31com_10261_3col_10261_284
High-performance Ni-YSZ thin-walled microtubes for anode-supported solid oxide fuel cells obtained by powder extrusion moulding
Arias, B. I.
Sotomayor, M. E.
Várez, A.
Levenfeld, Belén
Monzón, Hernán
Laguna-Bercero, M. A.
Larrea, A.
European Commission
Ministerio de Ciencia e Innovación (España)
Ministerio de Economía y Competitividad (España)
Comunidad de Madrid
Aiming at the fabrication of microtubular anode-supports for Solid Oxide Fuel Cell (SOFC) applications, this contribution deals with the production of Ni-YSZ thin-walled tubes (<1 mm thickness) via Powder Extrusion Moulding (PEM). The overall method has been optimized with an emphasis on the effect of NiO particle size using two commercial NiO powders with mean sizes of 0.7 and 8 μm. A thermoplastic binder system based on polypropylene (PP), paraffin wax (PW) and stearic acid (SA) in volume ratios of 50, 46 and 4, respectively, was used along with corn starch as a pore forming agent. Different feedstocks with solid loadings varying from 45 to 65 vol% were processed and characterized to determine the optimal formulation. Typically, the mixtures exhibited a pseudoplastic behaviour from 100 to 1000 s. Feedstocks with finer NiO particles had the most balanced properties for PEM purposes and an optimal powder volume content of 65 vol% was established. After extrusion and debinding steps, defect-free and constant cross-section tubes with 15 mm of length and 4 mm of nominal diameter were obtained. The final microstructure and DC conductivity were found to be closely linked to the NiO particle size, yielding a higher degree of open porosity and a better performance when using finer NiO powder. Based on this study, the packing mechanism was found to be likely limited by the contribution of steric hindrances when dissimilar and coarse powders are mixed, which may play a decisive role in order to set tailored formulations.
Authors would like to thank financial support received from MICINN and Feder program of the European Community (MAT2013-46452-C4-3R and MAT2012-30763 projects), and Madrid regional government (MATERYENER3CM S2013/MIT-2753 Program).
Peer Reviewed
2017-04-20T10:35:11Z
2017-04-20T10:35:11Z
2016
2017-04-20T10:35:11Z
artículo
http://purl.org/coar/resource_type/c_6501
doi: 10.1039/c5ra28183k
e-issn: 2046-2069
RSC Advances 6(23): 19007-19015 (2016)
http://hdl.handle.net/10261/148580
10.1039/c5ra28183k
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100004837
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/100012818
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-46452-C4-3-R
S2013/MIT-2753/MATERYENER3CM
Postprint
https://doi.org/10.1039/c5ra28183k
Sí
open
Royal Society of Chemistry (UK)