Preparation and Electrochemical Performance of Abaca‐Cotton Fabric Coated With Sugarcane Bagasse Biochar‐ NiCo ₂ O ₄ and Polypyrrole as Electrode for Energy Storage Applications

Abaca‐cotton fabric coated with sugarcane bagasse biochar‐NiCo 2 O 4 and polypyrrole, utilized as an electrode, which not only boosts the material's electrochemical performance but also promotes sustainability by utilizing bio‐waste for energy storage applications. Hydrothermal synthesis was used to prepare the biochar‐metal oxide. It was decorated on the fabric via the dip‐and‐dry method, followed by in situ polymerization of pyrrole. The successful incorporation of the materials onto the fabric is confirmed by several physicochemical characterization techniques, including SEM–EDX, FTIR, and XRD. The resulting fabric electrode was then used to assemble a symmetric coin cell supercapacitor. In CV testing, it exhibited a high areal capacitance of 769.77 ± 61.90 mF cm −2 at 5 mV s −1 scan rate, indicating excellent charge storage capacity. In GCD experiments, the cell demonstrated an areal capacitance of 972.37 ± 90.64 mFcm −2 ( n = 3) at 1 mA cm −2 , with the ability to store up to 12.36 ± 0.84 Wh kg −1 ( n = 3) of energy at 1.0 mA cm −2 . Additionally, the coin cell achieved a specific power of 654.13 ± 42.98 W kg −1 ( n = 3) at 6 mAcm −2 . The coin cell demonstrated high‐rate capability (80%) from 1 to 6 mA cm −2 current densities, good coulombic efficiency (> 90%), and retained 73% capacitance after 1000 cycles, showcasing the potential of fabric‐based electrodes for energy storage applications.