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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electric field-assisted sintering (gadolinia-doped ceria/alkali salts) composite membranes

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Author(s):
Carvalho, S. G. M. [1] ; Muccillo, E. N. S. [1, 2] ; Marques, F. M. B. [3] ; Muccillo, R. [1, 2]
Total Authors: 4
Affiliation:
[1] Energy & Nucl Res Inst IPEN, Ctr Sci & Technol Mat CCTM, BR-05508000 Sao Paulo, SP - Brazil
[2] Marques, F. M. B., Univ Aveiro, Dept Mat Engn \& Ceram, Aveiro, Portugal.Carvalho, S. G. M., Energy & Nucl Res Inst IPEN, Ctr Sci & Technol Mat CCTM, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Aveiro, Dept Mat Engn & Ceram, Aveiro - Portugal
Total Affiliations: 3
Document type: Journal article
Source: MATERIALIA; v. 11, JUN 2020.
Web of Science Citations: 0
Abstract

Composite ceramic membranes were prepared according to two routes: (i) vacuum impregnation of molten eutectic sodium-lithium carbonates (NLC) into porous ceria-20 mol% gadolinia (20GDC) solid electrolytes; (ii) electric field-assisted sintering of a 25 wt% NLC/75 wt% 20GDC mixture. Porous 20GDC ceramics were obtained by controlled thermal removal of 40 vol%KCl added as pore former. Electric field-assisted (flash) sintering was carried out monitoring thickness during application of 200 V cm(-1) to the specimen positioned in a sample chamber inserted in a vertical dilatometer. The surfaces of the sintered membranes were observed in a scanning electron microscope. Electrochemical impedance spectroscopy measurements were performed in the 5 Hz to 13 MHz frequency range in the 280-580 degrees C range. Arrhenius plots showed the transition from oxide ion conduction (due to the solid electrolyte) to carbonate ion conduction (due to the molten NLC). Membranes flash sintered at 420 degrees C in 2 min showed electrical conductivity similar to membranes conventionally sintered at 690 degrees C for 2 h. (AU)

FAPESP's process: 17/11937-4 - A sustainable path to methane conversion by advanced electrochemical technologies
Grantee:Fabio Coral Fonseca
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC