GREEN TEA BIOMASS-DERIVED CARBON MATERIAL FOR SODIUM-ION BATTERY APPLICATIONS
Keywords:
Battery Energy Storage, Green tea, hydrothermal synthesis, hydrochar, Specific capacitance; electrochemical performance.Abstract
The growing demand for sustainable and cost-effective energy storage technologies has led to the consideration of renewable biomass-derived electrode materials for sodium-ion battery applications. This work directly utilized green tea biomass as a renewable carbon precursor to prepare carbon-based electrode material via a simple hydrothermal treatment route without chemical activation or using any additional activating agents. The effect of hydrothermal reaction time was studied by preparing samples at 220 °C with 6hr, 9hr and 12hr that is GT-6, GT-9 and GT-12. The structural, elemental and surface functional properties of the obtained carbon materials were investigated by X-ray diffraction, energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The electrochemical behavior was studied by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy using a three-electrode cell. Out of the samples studied, the material synthesized by 12hr i.e. GT-12 of hydrothermal treatment showed best electrochemical performance with specific capacitance of 52 F g-1 at current density of 1 A g−1 and satisfactory impedance characteristics. The results indicate that long-term hydrothermal treatment can change the structural and surface properties of biomass-derived carbon material and enhance its charge-storage performance. To summarize, the present work demonstrates a simple, activation-free, renewable and potentially low-cost method to convert green tea biomass into a functional carbon-based electrode material for potential Sodium Ion battery applications.
