Fabrication of a High‐Performance In Situ Synthesized N‐Doped Graphene Aerogel Decorated with Copper Oxide Nanocomposites for Supercapacitor Applications

In this research, high‐surface‐area graphene aerogel‐based electrodes are synthesized using a hydrothermal method to prepare N‐doped copper oxide/graphene aerogel (N‐doped CuO/GA) composites for supercapacitor applications. For the first time, nitrogen doping is introduced into the CuO/GA composite to enhance specific capacitance. Structural characteristics are evaluated using Fourier‐transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy, while the Brunauer–Emmett–Teller method is employed to analyze porosity. Electrochemical behavior and supercapacitive performance of the composite electrode are evaluated in a three‐electrode system using cyclic voltammetry (CV), electrochemical impedance spectroscopy, and galvanostatic charge–discharge (GCD) techniques. The composite exhibits a high specific capacitance of 333.3 F g −1 at a current density of 0.2 A g −1 , with energy and power densities of 33.3 and 0.59 kW kg −1 , respectively. Remarkably, the composite maintains 100% capacitance retention after 3000 charge–discharge cycles. Additionally, CV and GCD analyses are performed in a symmetric two‐electrode system, further validating the composite's potential for high‐performance supercapacitor applications.