Fabrication of Low-Cost and High-Energy Storage Capacitor Electrode from Teak (Tectona grandis) Leaves

In this work, the preparation of porous carbon obtainedfrom teak(Tectona grandis) leaves is reportedand used for supercapacitors (SCs). The teak leaf carbon (TLC) wasprepared using the biowaste as the carbon source precursors by NaOHactivation and pyrolysis at 700-1000 & DEG;C under a nitrogenatmosphere. The crystallinity, structural features, textural properties,and thermal stability of TLCs were characterized by a variety of state-of-the-arttechniques. Further electrochemical (EC) measurements, such as cyclicvoltammetry, electrochemical impedance spectroscopy, and galvanostaticcharge-discharge using a three-electrode setup, were done.The TLC-900 has micro- and mesoporous materials with large surfaceareas and pore volumes as high as 1692.6 m(2) g(-1) and 0.86 cm(3) g(-1), respectively. Also,they exhibit remarkable EC and capacitive properties, achieving amaximum high specific capacitance (C (sp)) of 310 F g(-1) with a current density of 1.0 Ag-1 in a 3.0 M KOH solution. Notably, TLC-900 attaineda EC stability, achieving 123% retention in the same electrolyte after10,000 cycles at a current of 1.0 A g(-1). As a result,the fabricated device displayed a maximum energy density of 24 W hkg(-1) and power density of 1818 W kg(-1) at a current density of 10 A g(-1). These outstandingEC behaviors, oxygen-containing functional groups, and structuralcharacteristics of this porous carbon material indicate that TLCsare attractive for the fabrication of future large-scale industrialSCs.

Automated summary

This study reports the preparation of porous carbon material from teak leaves and its application in supercapacitors. The teak leaf carbon (TLC) was prepared through NaOH activation and pyrolysis under a nitrogen atmosphere. The TLC-900 exhibited micro- and mesoporous structures with high surface areas and pore volumes. It showed remarkable electrochemical properties and achieved high specific capacitance and stability in 3.0 M KOH electrolyte.