中國有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 31 No. 5 May 2021 |
（1. Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology, Ma’anshan 243032, China;
2. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, China;
3. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China）
Abstract:An electrochemical study on the redox behavior of indium in the eutectic LiCl-KCl system at 450 °C was carried out with the transient techniques of cyclic voltammetry and chronopotentiometry on an inert molybdenum electrode. The reduction of In(III) was found to be a two-step process involving In(III)/In(I) and In(I)/In couples at the potentials of about -0.4 and -0.8 V versus Ag/AgCl, respectively. The redox mechanism was further confirmed by the theoretical evaluation of the number of transferred electrons based on cyclic voltammetry and characterizations of the precipitates generated by the potentiostatic electrolysis. The diffusion coefficients of indium ions in the eutectic LiCl-KCl melt at 450 °C were estimated by cyclic voltammetry and chronopotentiometry. The results obtained through the two methods are in fair agreement, delivering an average diffusion coefficient of approximately 1.8×10-5 cm2/s for In(III), and 1.4×10-4 cm2/s for In(I).
Key words: indium ions; redox behavior; eutectic LiCl-KCl melt; end-of-life LCDs; resources recycling
