Enhanced Electrochemical Performance of NiCo‐Layered Double Hydroxides: Optimal Synthesis Conditions and Supercapacitor Applications

Abstract In the quest for high‐performance supercapacitor electrode materials, layered double hydroxides (LDHs) containing transition metals, particularly nickel–cobalt layered double hydroxides (NiCo‐LDH), have garnered significant attention due to their distinctive structural and electrochemical properties. In this study, five different temperatures, five distinct reaction times, and four varied Ni:Co ratios to determine the optimal reaction conditions are established. Utilizing these parameters, NiCo‐LDH via a one‐step hydrothermal method is synthesized. Under optimal conditions the specific capacitance reaches 400.2 C g −1 at a current density of 1 A g −1 . The assembled supercapacitor has a high energy density of 51.59 µWh cm −2 at a power density of 1.125 mW cm −2 . After 10 000 cycles, the capacity retention is 70%, indicating good cycling stability and demonstrating potential for application in supercapacitors. These tests provide theoretical and data‐based support for subsequent experiments and present new opportunities for advancing energy storage and conversion technologies.