CAJ | 학술논문

研究了773 K时GdCl3在LiCl-KCl熔盐体系中在Mo和Al电极上的电化学行为和热力学特性.利用开路计时电位曲线得到了Gd(III)/Gd(0)体系在723-873 K温度范围的平衡电极电位和表观电极电位.结果表明：平衡电极电位和表观电极电位随着温度的升高而变正.通过吉布斯自由能变进一步计算得到了GdCl3在LiCl-KCl熔盐体系中不同温度下的活度系数.结合稳态极化曲线,求得去极化值,并通过热力学计算,求得773 K时Gd的理论提取效率.在773 K时,在LiCl-KCl-GdCl3体系中,以Al为工作电极在-1.5 V左右通过恒电位电解提取Gd,电解20 h后实际电解提取效率为94.22%.对电解沉积物进行X射线衍射(XRD)分析,检测到了Al3Gd合金相.
연구료773 K시GdCl3재LiCl-KCl용염체계중재Mo화Al전겁상적전화학행위화열역학특성.이용개로계시전위곡선득도료Gd(III)/Gd(0)체계재723-873 K온도범위적평형전겁전위화표관전겁전위.결과표명：평형전겁전위화표관전겁전위수착온도적승고이변정.통과길포사자유능변진일보계산득도료GdCl3재LiCl-KCl용염체계중불동온도하적활도계수.결합은태겁화곡선,구득거겁화치,병통과열역학계산,구득773 K시Gd적이론제취효솔.재773 K시,재LiCl-KCl-GdCl3체계중,이Al위공작전겁재-1.5 V좌우통과항전위전해제취Gd,전해20 h후실제전해제취효솔위94.22%.대전해침적물진행X사선연사(XRD)분석,검측도료Al3Gd합금상.
The electrochemical behavior and thermodynamic properties of GdCl3 in LiCl-KCl molten salt system on both Mo and Al electrodes at 773 K were investigated. An open circuit chronopotentiogram was used to determine the equilibrium potentials and standard apparent potentials of the Gd(III)/Gd(0) system in the temperature range 723-873 K. The results showed that the equilibrium potentials and apparent standard potentials became positive with increasing temperature. The activity coefficients of GdCl3 were calculated at different temperatures. The depolarization values were calculated by steady state polarization tests, and the theoretical extraction efficiency was obtained at 773 K. Potentiostatic electrolysis was performed to extract gadolinium from LiCl-KCl-GdCl3 molten salt on Al electrodes at-1.5 V. The extraction efficiency was about 94.22%after 20 h. The Al3Gd phase was identified in the deposit by X-ray diffraction (XRD).