Explicit study on the oxidation mechanism of nickel in molten Li2CO3-K2CO3 |
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Authors: | Mohamed Mohamedi Yasunari Hisamitsu Takashi Kudo Takashi Itoh Isamu Uchida |
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Affiliation: | (1) Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 07 Aramaki-Aoba, Aoba-Ku, Sendai 980-8579, Japan,;(2) Research and Development Center, Tohoku Electric Power Co. Inc., 7-2-1 Nakayama, Aoba-Ward, Sendai 981-0952, Japan, |
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Abstract: | 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. Electronic Publication |
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Keywords: | Molten carbonates Nickel oxidation Lithiation Impedance spectroscopy |
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