The Effect of Metal Cation Doping on the Microstructure and Electrochemical Properties of Co-Fe Layered Double Hydroxide

A hydrothermal method is employed to successfully fabricate Co-Fe LDH self-supported materials on a nickel foam substrate. Ni 2+ and Mn 2+ are additionally incorporated into the materials. The electrode materials are subjected to phase analysis using an X-ray diffractometer. The electrode materials are analyzed for morphology employing a scanning electron microscope. Electrochemical characteristics of the electrode materials are assessed by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy tests using an electrochemical workstation. The research results demonstrate that the electrode materials doped with Ni 2+ and Mn 2+ exhibit significantly enhanced electrochemical properties. The Ni 2+ -doped Co-Fe LDH exhibits a charge–discharge duration of 2200 s with a specific capacitance of 1036.4 C g −1 , whereas the Mn 2+ -doped Co-Fe LDH shows a specific capacitance of 708.1 C g −1 . Furthermore, the calculation of specific capacitance at different current densities indicates that the electrode doped with Ni 2+ (71.20%) and Mn 2+ (74.00%) outperform the Co-Fe LDH electrode (67.39%) in terms of rate capability.