Electrochemical upcycling of indium-gallium-zinc oxide scraps
At present, the processes of recovering indium-gallium-zinc oxide (IGZO) scraps through hydrometallurgy, pyrometallurgy, or molten salt electro-deoxidation are cumbersome, impurities cannot well be effectively removed, and the environmental benefits are inferior. We herein firstly propose a facile electrochemical method for upcycling of IGZO scraps in ammonium salt aqueous solution at ambient temperature. The feasibility of electro-deoxidation of IGZO in aqueous solution has been verified, using IGZO scraps without further crushing as the cathode and anode. The electro-deoxidation behavior of various oxides exhibits differentiation, among which indium oxide is the most easily deoxidized. This difference hinders the formation of a dense alloy layer on the surface of the IGZO substrate, facilitating the transfer of oxygen ions and enabling continuous electro-deoxidation. Impurities such as aluminum and silicon can be significantly removed, with removal rates of 95.8 % and 75.7 %, respectively, which is also attributed to the difference in electrochemical reduction ability between impurity oxides and IGZO, as well as the solid-state existence of cathode products. The process of upcycling IGZO scraps contributes to recovery with straightforward operation and more adaptable implementation environment, which endows it with optimistic application potential.
危险品化学品经营许可证（带存储）