Bulletin of ANPA

Abstract submitted to ANPA Conference July 14–16, 2023

Volume 5, Number 1

Condensed Matter Physics and Material Science
Abstract ID: ANPA2023-N00046

Abstract:

ANPA2023-N00046: Hierarchically Porous Carbon Materials from Phyllanthus emblica Seed Stones as the Electrode Materials for the High-Performance Supercapacitors

Authors:

  • Chhabi Lal Gnawali; Department of Applied Sciences and Chemical Engineering, Pulchowk Campus, Institute_x000D_ of Engineering (IOE), Tribhuvan University, Lalitpur, Nepal
  • Rekha Goswami Shrestha, Rinita Rajbhandari , Bhadra P. Pokharel, Lok Kumar Shrestha; NIMS Japan, TU Nepal, TU Nepal, NIMS Japan

High surface area nanoporous activated carbon materials synthesized from natural carbon sources such as biowaste with large porosity and well-defined pore structures are preferred as electrode materials for high-performance supercapacitors. Here we report the fabrication of novel nanoporous activated carbon material from Phyllanthus emblica (Amala) seed stones by the chemical activation using potassium hydroxide (KOH) as an activator at different carbonization temperatures (700-1000 °C) under the nitrogen gas atmosphere. The precursor and the prepared carbon materials were characterized by the thermogravimetric analysis (TGA), Fourier transform-infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Raman scattering, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Nitrogen adsorption-desorption isotherms estimated the specific surface area, pore size distribution, and average pore size. The total specific surface area ranges from 1360 to 1946 m2 g-1, and the total pore volume ranges from 0.664 to 1.328 cm3 g-1. The electrochemical energy storage performance was studied by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) in an aqueous 1 M sulfuric acid (H2SO4) solution in a three-electrode cell set up. The specific capacitance of the sample with best surface area was found to be 272 F g-1 at a current density of 1 A g-1 followed by 60% capacitance retention at a high current density of 50 A g-1. Additionally, the electrode showed outstanding cycle performance of 98 % after 10,000 charging/discharging cycles. These results indicate that the prepared nanoporous activated carbon material from Phyllanthus emblica seed stones led to the excellent supercapacitor electrode material for high-energy-storage supercapacitor applications. Keywords: Phyllanthus emblica seed, KOH activation, nanoporous activated carbon, electrochemical measurement, supercapacitor

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00046