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Received June 20, 2012
Accepted July 20, 2012
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MgCl2-CaCl2-NaCl 혼합용융염에서 Mg2+ 이온의 전기화학적 거동
Electrochemical Behavior of Mg2+ Ions in MgCl2-CaCl2-NaCl Molten Salt
충북대학교 화학공학과, 361-763 충북 청주시 흥덕구 내수동로 52 1한국원자력연구원, 305-353 대전광역시 유성구 대덕대로 989번길 111
Department of Chemical Engineering, Chungbuk National University, 52 Naesudong-ro, Heungdeok-gu, Cheongju, Chungbuk 361-763, Korea 1Korea Atomic Energy Research Insitute, Daedeok-daero 989-111, Yuseong-gu, Daejeon 305-353, Korea
smjeong@chungbuk.ac.kr
Korean Chemical Engineering Research, December 2012, 50(6), 939-944(6), 10.9713/kcer.2012.50.6.939 Epub 29 November 2012
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Abstract
본 연구에서는 MgCl2-CaCl2-NaCl 혼합용융염에서 Mg2+ 이온의 전기화학적 거동을 평가하였다. MgCl2-CaCl2-NaCl 용융염에서 순환전압전류법 측정을 통해 Mg2+ 이온의 환원전위를 측정하였고, MgCl2의 농도 변화 및 용융염의 온도 변화에 따른 환원전위의 영향에 대해 살펴보았다. 그리고 각각 660, 680, 700, 720 및 740 ℃의 온도에서 Mg2+ 이온의 확산계수를 계산한 결과 8.79×10^(-6), 9.56×10^(-6), 1.17×10^(-5), 1.4×10^(-5) 및 1.77×10^(-5) cm2 s^(-1)로 측정되었다. 또한 Arrhenius_x000D_
식을 통해 Mg2+ 이온의 확산에 대한 활성화 에너지는 70.28 kJ mol^(-1)로 계산되었다.
The electrochemical behavior of magnesium ions was examined by cyclic voltammetry in a molten MgCl2-CaCl2-NaCl salt. The reduction potential of magnesium ions was measured and those values were estimated with the variation of the concentration of MgCl2 and the temperature of molten salts. The diffusion coefficient of the Mg2+ ions has been determined at 660, 680, 700, 720 and 740 ℃. The values were 8.79×10^(-6), 9.56×10^(-6), 1.17×10^(-5), 1.4×10^(-5) and_x000D_
1.77×10^(-5) cm2 s^(-1). The activation energy for the diffusion processes of Mg2+ ions was found to be 70.28 kJ mol^(-1) by using the Arrhenius equation.
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