Effects of NiO loading and pre-calcination temperature on NiO-SDCC composite anode powder for low-Temperature solid oxide fuel cells

N. K. Hoa, H. A. Rahman, Mahendra Rao Somalu

Research output: Contribution to journalArticle

Abstract

The microstructural and thermal characteristics of NiO-samarium-doped ceria carbonate (NiO-DCC) composite powders have been explored in terms of NiO loading and pre-calcination temperature. NiO-SDCC composite powders were intimately mixed via fast ball-milling using different NiO loadings (50 -70 wt. %) and subjected to various pre-calcination temperatures (600 -800°C). Subsequently, the pre-calcined powders were then used to fabricate composite pellets using a uniaxial press and sintered at a low temperature of 600°C. The crystalline phase, carbonate bonding, microstructure and thermal behaviour of the composite anode powders were investigated. The microstructure, porosity, and hardness of sintered composite pellets were also evaluated. All samples maintained their chemical compatibility and carbonate bonding after various processes. The findings indicated that the pre-calcination factor was more important than NiO loading in terms of powder and pellet morphologies as well as the thermal expansion behaviour. Moreover, the composite pellets prepared with composite powders pre-calcined at increasing temperatures exhibited an increase in porosity, but within an acceptable range (30 -40 %). Overall, composite pellets fabricated with 50 wt. % NiO exhibited the optimum hardness values of 21 -31 HV and the lowest thermal expansion of 12.2 -12.7 × 10-6 K-1.

Original languageEnglish
Pages (from-to)50-58
Number of pages9
JournalCeramics - Silikaty
Volume62
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Powders
Calcination
roasting
Anodes
anodes
pellets
composite materials
Composite materials
Carbonates
carbonates
Temperature
temperature
Thermal expansion
thermal expansion
hardness
Porosity
Hardness
Samarium

Keywords

  • Calcination
  • Nickel oxide (NiO)
  • Samarium-doped ceria carbonate (SDCC)
  • Solid oxide fuel cell
  • Thermal behaviour

ASJC Scopus subject areas

  • Analytical Chemistry
  • Ceramics and Composites
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Effects of NiO loading and pre-calcination temperature on NiO-SDCC composite anode powder for low-Temperature solid oxide fuel cells. / Hoa, N. K.; Rahman, H. A.; Somalu, Mahendra Rao.

In: Ceramics - Silikaty, Vol. 62, No. 1, 01.01.2018, p. 50-58.

Research output: Contribution to journalArticle

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abstract = "The microstructural and thermal characteristics of NiO-samarium-doped ceria carbonate (NiO-DCC) composite powders have been explored in terms of NiO loading and pre-calcination temperature. NiO-SDCC composite powders were intimately mixed via fast ball-milling using different NiO loadings (50 -70 wt. {\%}) and subjected to various pre-calcination temperatures (600 -800°C). Subsequently, the pre-calcined powders were then used to fabricate composite pellets using a uniaxial press and sintered at a low temperature of 600°C. The crystalline phase, carbonate bonding, microstructure and thermal behaviour of the composite anode powders were investigated. The microstructure, porosity, and hardness of sintered composite pellets were also evaluated. All samples maintained their chemical compatibility and carbonate bonding after various processes. The findings indicated that the pre-calcination factor was more important than NiO loading in terms of powder and pellet morphologies as well as the thermal expansion behaviour. Moreover, the composite pellets prepared with composite powders pre-calcined at increasing temperatures exhibited an increase in porosity, but within an acceptable range (30 -40 {\%}). Overall, composite pellets fabricated with 50 wt. {\%} NiO exhibited the optimum hardness values of 21 -31 HV and the lowest thermal expansion of 12.2 -12.7 × 10-6 K-1.",
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AB - The microstructural and thermal characteristics of NiO-samarium-doped ceria carbonate (NiO-DCC) composite powders have been explored in terms of NiO loading and pre-calcination temperature. NiO-SDCC composite powders were intimately mixed via fast ball-milling using different NiO loadings (50 -70 wt. %) and subjected to various pre-calcination temperatures (600 -800°C). Subsequently, the pre-calcined powders were then used to fabricate composite pellets using a uniaxial press and sintered at a low temperature of 600°C. The crystalline phase, carbonate bonding, microstructure and thermal behaviour of the composite anode powders were investigated. The microstructure, porosity, and hardness of sintered composite pellets were also evaluated. All samples maintained their chemical compatibility and carbonate bonding after various processes. The findings indicated that the pre-calcination factor was more important than NiO loading in terms of powder and pellet morphologies as well as the thermal expansion behaviour. Moreover, the composite pellets prepared with composite powders pre-calcined at increasing temperatures exhibited an increase in porosity, but within an acceptable range (30 -40 %). Overall, composite pellets fabricated with 50 wt. % NiO exhibited the optimum hardness values of 21 -31 HV and the lowest thermal expansion of 12.2 -12.7 × 10-6 K-1.

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