Realizing High-Performance NiFe Layered Double Hydroxide (LDH) Composite Electrode Materials for Supercapacitors

Abstract

This study presents the synthesis and electrochemical evaluation of NiFe-LDH electrode materials with varying Ni/Fe ratios, developed via a hydrothermal method for application in high-performance supercapacitors. Among the samples, NiFe-LDH-1:3 demonstrated the highest mass-specific and area-specific capacitance, attributed to its optimized charge storage and transport properties. An asymmetric supercapacitor was developed, featuring NiFe-LDH-1:3 as the positive electrode paired with activated carbon as the negative electrode. This configuration achieved an energy density of 499.1625 Wh/cm 2 and a power density of 4050 W/cm 2 , operating reliably within a voltage window of 1.7 V. These findings underscore the critical role of Ni/Fe ratio optimization in enhancing the electrochemical performance of NiFe-LDH materials, positioning NiFe-LDH-1:3 as a promising candidate for next-generation energy storage applications.