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

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.