Dissolution behavior of Co-coated NiO cathode in molten (Li 0.62K0.38)2CO3 eutectics

B. H. Ryu, Jonghee Han, S. P. Yoon, SukWoo Nam, T. H. Lim, S. A. Hong, K. B. Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The dissolution behavior of the NiO-CoO electrodes in molten (Li 0.62K0.38)2CO3 eutectics as a function of Co content was investigated under the standard cathodic gas composition at 650°C. In order to prepare NiO-CoO electrodes, Co was deposited on the porous Ni electrode using galvanostatic pulse plating technique followed by the oxidation process. Compared to the pure NiO electrode, NiO-CoO electrodes showed low Ni solubility in molten (Li0.62K 0.38)2CO3 eutectics. Solubility of NiO-CoO electrodes depended on the partial pressure of carbon dioxide (PCO2) and the Ni solubility increased with PCO2. On the other hand, the Ni solubility was not affected by the partial pressure of oxygen (PO2). The XRD analysis after the dissolution experiment, showed that the Ni solubility decreased with increase of the amount of lithium incorporated in the electrodes and that the lithium incorporation was promoted by the formation of NiO-CoO solid solution. The results obtained in the present study suggested that NiO-CoO solid solution could effectively suppress the NiO dissolution in the molten (Li0.62K0.38)2CO3 eutectics.

Original languageEnglish
Pages (from-to)62-70
Number of pages9
JournalJournal of Power Sources
Volume137
Issue number1
DOIs
Publication statusPublished - 2004 Oct 5
Externally publishedYes

Fingerprint

eutectics
Eutectics
Molten materials
dissolving
Dissolution
Cathodes
cathodes
Electrodes
electrodes
solubility
Solubility
Lithium
Partial pressure
partial pressure
Solid solutions
solid solutions
lithium
gas composition
plating
Plating

Keywords

  • Cathode
  • Co
  • Galvanostatic pulse plating
  • MCFC
  • NiO dissolution

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Dissolution behavior of Co-coated NiO cathode in molten (Li 0.62K0.38)2CO3 eutectics. / Ryu, B. H.; Han, Jonghee; Yoon, S. P.; Nam, SukWoo; Lim, T. H.; Hong, S. A.; Kim, K. B.

In: Journal of Power Sources, Vol. 137, No. 1, 05.10.2004, p. 62-70.

Research output: Contribution to journalArticle

Ryu, B. H. ; Han, Jonghee ; Yoon, S. P. ; Nam, SukWoo ; Lim, T. H. ; Hong, S. A. ; Kim, K. B. / Dissolution behavior of Co-coated NiO cathode in molten (Li 0.62K0.38)2CO3 eutectics. In: Journal of Power Sources. 2004 ; Vol. 137, No. 1. pp. 62-70.
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