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

Abstract

In this work, the preparation of porous carbon obtained from teak (Tectona grandis) leaves is reported and used for supercapacitors (SCs). The teak leaf carbon (TLC) was prepared using the biowaste as the carbon source precursors by NaOH activation and pyrolysis at 700−1000 °C under a nitrogen atmosphere. The crystallinity, structural features, textural properties, and thermal stability of TLCs were characterized by a variety of state-of-the-art techniques. Further electrochemical (EC) measurements, such as cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge−discharge using a three-electrode setup, were done. The TLC-900 has micro-and mesoporous materials with large surface areas 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 a maximum high specific capacitance (C sp ) of 310 F g −1 with a current density of 1.0 A g −1 in a 3.0 M KOH solution. Notably, TLC-900 attained a EC stability, achieving 123% retention in the same electrolyte after 10,000 cycles at a current of 1.0 A g −1 . As a result, the fabricated device displayed a maximum energy density of 24 W h kg −1 and power density of 1818 W kg −1 at a current density of 10 A g −1 . These outstanding EC behaviors, oxygen-containing functional groups, and structural characteristics of this porous carbon material indicate that TLCs are attractive for the fabrication of future large-scale industrial SCs.

New Understanding of Meta-Topolin Riboside Metabolism in Micropropagated Woody Plants

“…T. grandis is widely utilized for its wood in constructing floors, cabinets, and boats. Traditionally employed for sculpting and everyday household items, a recent discovery highlighted the capacities of T. grandis leaves for wastewater treatment, dye removal, and biogas production [19].…”