Abstract:The electrochemical behavior of Cu(I) in eutectic LiCl-KCl (58.5︰41.5 mol ratio) melt was investigated on graphite and Mo electrodes at 500 ℃ by cyclic voltammetry, square wave voltammetry, chronopotentiometry, and linear sweep voltammetry. The cathodic peak currents and initial deposition potentials of copper under different concentrations of CuCl were obtained. The results show that two initial reduction potentials of copper ions are obtained at -1.05 V and -1.55 V on graphite electrode, which correspond to Cu(II)/Cu(I), and Cu(I)/Cu(0) couples, respectively. Reduction of Cu(I) is a quasi-reversible process controlled by diffusion mass transfer. The diffusion coefficients of Cu(I), calculated by the results of cyclic voltammetry and chronopotentiometry, is 1.79×10-5 cm2/s and 1.26×10-5 cm2/s, respectively.