Explicit study on the oxidation mechanism of nickel in molten Li2CO3-K2CO3

Mohamed Mohamedi, Yasunari Hisamitsu, Takashi Kudo, Takashi Itoh, Isamu Uchida

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The oxidation behavior of nickel in Li + K carbonate melt is followed by measuring the open-circuit potential and by electrochemical impedance spectroscopy under an O2 + CO2 gas mixture in the ratio 90/10 at a total pressure of 1 atm at 650 °C. X-ray diffraction (XRD) and energy-dispersive spectroscopy are employed for qualitative and quantitative analyses of the different compounds involved during the oxidation of nickel. Atomic force microscopy is used for both imaging the evolution of the oxide layer and determining its surface roughness. The in situ oxidation process of nickel demonstrates three stages: rapid formation of a compact surface oxide (first stage), thicker oxide layer (second stage), and a porous oxide structure (third stage). The lithiation reaction has been identified to occur during the second stage. Formation of an intermediate and unstable compound, namely NiCO3, has been confirmed by XRD.

Original languageEnglish
Pages (from-to)538-545
Number of pages8
JournalJournal of Solid State Electrochemistry
Issue number7-8
Publication statusPublished - 2001 Dec 1


  • Impedance spectroscopy
  • Lithiation
  • Molten carbonates
  • Nickel oxidation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering


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