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Hu X.-W.,Northeastern University China | Hu X.-W.,Engineering Research Center for Process Technology of Nonferrous Metallurgy | Sheng Z.,Northeastern University China | Sheng Z.,Engineering Research Center for Process Technology of Nonferrous Metallurgy | And 8 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2014

The construction and characteristics of sample cell used for electrochemical in situ Raman spectra research on molten salts in the previous literatures and the development in that research field were reviewed. The sample cells in the previous researches were mainly used for the right (θ=90°) scattering mode, and the measurements were usually carried out under inert atmosphere. The constant current or constant potential method was mainly used, and the research involves the cathodic behavior of electrolysis of metal Al, Hg, Cd, and Ta in molten chloride, reduction process of oxygen in molten (Li-K)CO3 and Li2CO3, electrochemical process of I2 in molten AlCl3-NaCl of the high energy molten salt battery using metal aluminum as the anode, behavior of element sulfur in molten AlCl3-NaCl during the discharge process of sodium-sulfur battery, the electrochemical corrosion of oxygen ion conductor of Y2O3-stabilized ZrO2 in molten Na2SO4, and the change on structure of melts in the interface between molten KNO3 and NaNO3 and platinum electrode. At last, the development directions of the electrochemical in situ Raman spectroscopy in molten salts are pointed out.


Hu X.,Northeastern University China | Hu X.,Engineering Research Center for Process Technology of Nonferrous Metallurgy | Yu Z.,Northeastern University China | Yu Z.,Engineering Research Center for Process Technology of Nonferrous Metallurgy | And 8 more authors.
Chinese Optics Letters | Year: 2014

We study ionic structure of KNO3-NaNO2 melts under air atmosphere by using Raman spectroscopy. Molar fraction of NO3 - and NO2 - is obtained and thermal stability of this kind of melts system is then analyzed. The results show that when the temperature is increased to a certain value, equilibrium between the decomposition of NO3 -and the oxidation of NO2 - exists in KNO3 -NaNO2 melts. When temperature is higher than 644 K, the molar fraction of NO3 -decreases a little with temperature increasing for the melts in which the initial fraction of KNO3 is 90 wt%, but for the melts in which the initial fraction of KNO3 is 10-80 wt%, the molar fraction of NO3 - increases with temperature, and the increasing rate is slower for a higher initial fraction of KNO3. Molar fraction of NO3 - increment increases linearly with initial fraction of NaNO2. The sample in which the initial fractions of NaNO2 are 11.3 and 14.5 wt% under air atmosphere shows the best thermal stability at 762 and 880 K, respectively. © 2014 Chinese Optics Letters


Chen G.,Northeastern University China | Shi Z.,Northeastern University China | Shi Z.,Engineering Research Center for Process Technology of Nonferrous Metallurgy | Liu A.,Northeastern University China | And 8 more authors.
Electrochemistry | Year: 2013

The electrochemical behavior of graphite anode in KF-KBF4 molten salt at 500°C was studied by means of cyclic voltammetry, electrochemical impedance spectroscopy and chronopotentiometry techniques in this present work. The results showed that I-type "CF" compound is formed at 1.5 V vs. Pt-QRE, and II-type "CF" compound is formed at 2.1 V, while fluorine gas is formed at 4.9 V. The electrochemical reaction at 1.5 V is quasi-reversible, while the electrochemical reaction at 2.1 V is irreversible. The resistance of II-type "CF" compound is higher than I-type "CF" compound, and the value of charge transfer coefficient (β) for electrochemical formation II-type "CF" compound is calculated to be 0.26. © The Electrochemical Society of Japan 2013.

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