Modification of Ni-based cathode material for molten carbonate fuel cells using Co3O4

Young Suk Kim, Cheol Woo Yi, Hee Seon Choi, Keon Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The degradation of cathode materials due to the so-called 'NiO dissolution' problem, is one of the most critical issues restricting the long-term operation of molten carbonate fuel cells (MCFCs). To overcome this problem, a modified NiO powder is prepared by the annealing of a pre-mixed powder consisting of Ni powder and Co3O4 nano-particles (n-Co3O 4) at 650 °C. Annealing above 300 °C plays an important role in converting the physically bound mixed oxide system to a chemically bound system and, therefore, the separation of n-Co3O4 from Ni is prevented. This modification leads to the formation of a Ni 0.9Co0.1O solid solution, and the lithiated Ni 0.9Co0.1O has a core-shell structure that consists of different Li contents. Whereas the core phase has a low concentration of lithium, the outer layer is a highly lithiated phase. Since the highly lithiated outer phase, acting as a barrier, minimizes the dissolution of NiO, the modified cathode demonstrates good electrochemical properties and chemical stability under actual operating conditions. This study can provide an effective way to mass produce MCFC cathode materials.

Original languageEnglish
Pages (from-to)1886-1893
Number of pages8
JournalJournal of Power Sources
Volume196
Issue number4
DOIs
Publication statusPublished - 2011 Feb 15

Fingerprint

molten carbonate fuel cells
Molten carbonate fuel cells (MCFC)
Powders
Cathodes
cathodes
dissolving
Dissolution
Annealing
cell cathodes
annealing
Chemical stability
mixed oxides
Electrochemical properties
Lithium
Oxides
low concentrations
Solid solutions
solid solutions
lithium
degradation

Keywords

  • Cathode material
  • Lithiation
  • Molten carbonate fuel cell
  • Neutron diffraction
  • Solubility

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Modification of Ni-based cathode material for molten carbonate fuel cells using Co3O4 . / Kim, Young Suk; Yi, Cheol Woo; Choi, Hee Seon; Kim, Keon.

In: Journal of Power Sources, Vol. 196, No. 4, 15.02.2011, p. 1886-1893.

Research output: Contribution to journalArticle

Kim, Young Suk ; Yi, Cheol Woo ; Choi, Hee Seon ; Kim, Keon. / Modification of Ni-based cathode material for molten carbonate fuel cells using Co3O4 In: Journal of Power Sources. 2011 ; Vol. 196, No. 4. pp. 1886-1893.
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