A study on the chemical stability and electrode performance of modified NiO cathodes for molten carbonate fuel cells

Seung G. Kim, Sung Pil Yoon, Jonghee Han, SukWoo Nam, Tae Hoon Lim, In Hwan Oh, Seong A. Hong

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The chemical stabilities of modified NiO cathodes doped with 1.5 mol% CoO and 1.5 mol% LiCoO2 fabricated by a conventional tape casting method were evaluated through the real MCFC single cell operation. The heat-treated samples before oxidation had proper porosities and microstructures for a MCFC cathode. At 150 mAcm-2 in current density, the MCFC single cell using a CoO-doped NiO cathode showed stable cell voltages in the range of 0.833-0.843 V for 1000 h. In contrast, the cell using a LiCoO2-doped NiO cathode with a maximum of 0.836 V at 500 h degraded to 0.826 V at 1000 h due to a wet seal breakdown at the cathode side. The amounts of nickel precipitated in the electrolytes of the cells using modified NiO cathodes doped with CoO and LiCoO2 after the operation for 1000 h were 1.2 and 1.4 wt.%, respectively, which were about 60% lower than that of the standard cells using pure NiO cathodes. The enhanced chemical stability of modified NiO cathodes seems to be attributed to the fact that the presence of cobalt increases the lithium content in the cathodes by converting Ni2+ to Ni 3+, resulting in stabilizing the layered crystal structure.

Original languageEnglish
Pages (from-to)3081-3089
Number of pages9
JournalElectrochimica Acta
Volume49
Issue number19
DOIs
Publication statusPublished - 2004 Aug 15
Externally publishedYes

Fingerprint

Molten carbonate fuel cells (MCFC)
Chemical stability
Cathodes
Electrodes
Cobalt
Nickel
Lithium
Tapes
Electrolytes
Seals
Casting
Current density
Porosity
Crystal structure
Oxidation
Microstructure

Keywords

  • Cathode dissolution
  • Cathode stability
  • Li-Co-Ni oxides
  • Molten carbonate fuel cell
  • Single cell performance

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

A study on the chemical stability and electrode performance of modified NiO cathodes for molten carbonate fuel cells. / Kim, Seung G.; Yoon, Sung Pil; Han, Jonghee; Nam, SukWoo; Lim, Tae Hoon; Oh, In Hwan; Hong, Seong A.

In: Electrochimica Acta, Vol. 49, No. 19, 15.08.2004, p. 3081-3089.

Research output: Contribution to journalArticle

Kim, Seung G. ; Yoon, Sung Pil ; Han, Jonghee ; Nam, SukWoo ; Lim, Tae Hoon ; Oh, In Hwan ; Hong, Seong A. / A study on the chemical stability and electrode performance of modified NiO cathodes for molten carbonate fuel cells. In: Electrochimica Acta. 2004 ; Vol. 49, No. 19. pp. 3081-3089.
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abstract = "The chemical stabilities of modified NiO cathodes doped with 1.5 mol{\%} CoO and 1.5 mol{\%} LiCoO2 fabricated by a conventional tape casting method were evaluated through the real MCFC single cell operation. The heat-treated samples before oxidation had proper porosities and microstructures for a MCFC cathode. At 150 mAcm-2 in current density, the MCFC single cell using a CoO-doped NiO cathode showed stable cell voltages in the range of 0.833-0.843 V for 1000 h. In contrast, the cell using a LiCoO2-doped NiO cathode with a maximum of 0.836 V at 500 h degraded to 0.826 V at 1000 h due to a wet seal breakdown at the cathode side. The amounts of nickel precipitated in the electrolytes of the cells using modified NiO cathodes doped with CoO and LiCoO2 after the operation for 1000 h were 1.2 and 1.4 wt.{\%}, respectively, which were about 60{\%} lower than that of the standard cells using pure NiO cathodes. The enhanced chemical stability of modified NiO cathodes seems to be attributed to the fact that the presence of cobalt increases the lithium content in the cathodes by converting Ni2+ to Ni 3+, resulting in stabilizing the layered crystal structure.",
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