Electrochemical Studies of ZnCl 2 Urea Melts

Abstract

研究了温度、浓度对ZnCl2-尿素熔体电导的影响,ZnCl2-NaCl-尿素熔体的电导率(125℃)可达30ms·cm-1以上.用循环伏安曲线、恒电位电解及断电后的电位-时间曲线,研究尿素熔体中Zn2+的电还原和锌在钛、铜电极上的电沉积.Zn2+的电还原为一步可逆过程,锌沉积在铜电极上会形成CuZn5合金.Zn2+在熔体中扩散系数为1.3×10-6cm2·s-1(125℃)The electric conductivities of ZnCl 2 Urea melts were determined.The influences of temperature and concentration on the conductance have been studied.The cylic voltammetry,potentiostatic electrolysis and open circuit potential time curve after electrolysis,X ray diffraction were used to investigate the electroreduction of Zn 2+ , electrodeposition of zinc on some electrodes in urea metal chlorides melt. The conductivity of urea NaCl ZnCl 2 melt can reach to over 30 ms·cm -1 (125 ℃), and has a liner relationship with temperature from 108 to 140 ℃. The electroreduction of Zn 2+ to zinc is reversible at one step, and CuZn 5 alloy has been found on copper electrode. The diffusion coefficient of Zn 2+ in urea NaCl ZnCl 2 melt was determined as 1.3×10 -6 cm 2·s -1 (125 ℃).作者联系地址:中山大学化学系Author's Address: Department of Chemistry, Zhongshan Universit

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