Synthesis of Nitrogen-Doped Activated Carbon Nanosheets Based on Biomass Derived from Waste Wheat Husks for Energy Storage

An issue confronting supercapacitors is the sustainability of their materials. Consequently, our research has concentrated on creating eco-friendly materials that have elevated energy density. We synthesized and regulated nitrogen-doped activated carbon from wheat husks (NWHC) using urea and FeCl 2 . We used techniques such as XRD, SEM, TEM, TGA, XPS, Raman spectra, and N 2 adsorption–desorption isotherm. The NWHC-800 has a large surface area of 1134.78 m 2 g −1 , a high nitrogen content of 5.25 wt.%, and is excellent at attracting water. The NWHC demonstrates exceptional electrochemical performance as an electrode material for supercapacitors. The symmetric supercapacitor, which is manufactured using the NWHC-800//NWHC-800 configuration, has an energy density of 21.33 Wh kg −1 at a power density of 450 W kg −1 . It also has exceptional cycling stability, with 87.2% retention of specific capacitance after 10,000 cycles. We obtained these results in a voltage range of 1.8 V using a 0.5 M Na 2 SO 4 aqueous solution. These results indicate that using NWHC-800 as the electrode material is a good choice for making high-performance supercapacitors. Graphical Our research focused on developing environmentally friendly materials with high energy density. We fabricated and structured nitrogen-enriched wheat husk activated carbon (NWHC) using urea and iron chloride. We used techniques such as XRD, SEM, TEM, TGA, XPS, Raman spectroscopy, and nitrogen adsorption equation.