Preparation and Electrochemical Characterization of ZnRE(Y, La, Dy) Bimetallic MOFs for Supercapacitor Electrodes

Three bimetallic coordination frameworks, ZnDy-MOF, ZnY-MOF, and ZnLa-MOF, were synthesized through hydrothermal method and characterized by XRD and SEM. All three exhibited smooth rod-like morphologies with uniform size distributions, indicating high sample purity. Electrochemical performance was evaluated using cyclic voltammetry, galvanostatic charge-discharge, electrochemical impedance spectroscopy, and cyclic stability testing. All three MOFs demonstrated good electrochemical stability and energy storage capability. Among them, ZnLa-MOF showed significantly superior performance, including longer discharge time, higher specific capacitance, and better rate capability. When assembled into an asymmetric device, ZnLa-MOF delivered an energy density of 60.12 Wh kg^-1 at a power density of 412.24 W kg^-1. These results highlight its potential for application in high-performance supercapacitors.