本文利用循环V-A法(CV)研究了Nd~(3+)在液体Ga电极上还原的电化学反应动力学。结果表明,Nd~(3+)在Ga电极上的还原是分步进行的。第一步在较高的电位扫描速度下为扩散控制的可逆电荷传递反应,即Nd~(3+)+e?Nd~(2+);在电位扫描速度较低时,随后的化学反应为第一步反应的控制步骤,即Nd~(3+)+e?快Nd~(2+)+mCl→慢NdCl_m~(2-m)。第二步为不可逆的电荷传递反应,即沉积的金属Nd与Ga合金化,Nd~(2+)+2e→Nd(Ga)。估算了该反应的标准反应速度常数为7.0×10~(-3)cm/s。
The kinetics of electrochemical reaction of Nd~(3+) reduced on liquid Gaelectrode has been studied by cyclic voltammetry (CV) in molten chloride at 1073K.The results show that the reduction of Nd~(3+)? on Ga electrode proceeds in consequenttwo steps. For the first step, it is found to be a diffusion controlled reversible re-action at higher rate of potential scan, i. c., Nd~(3+)+e=Nd~(2+) and an irreversible rea-ction controlled by following chemical reaction at lower rate, i. c., Nd~(3+)+e?Nd~(2+)+mCl NdCl'_m~(-m). For the second step, alloying reaction of deposited Nd with Ga canbe observed and the reaction is found to irreversible, Nd~(2+)+2e→Nd(Ga). The stand-ard rate constant of this reactiin is estimated to be 7.0×10~(-3) cm/s.
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