Kenaf-based activated carbon: A sustainable solution for high-performance aqueous symmetric supercapacitors

Subramaniam T 1 , Ansari MNM 2 , Krishnan SG 3 , Khalid M 4

Affiliations 

  • 1 Mechanical Engineering Department, Universiti Tenaga Nasional (UNITEN), 43000, Kajang, Malaysia
  • 2 Mechanical Engineering Department, Universiti Tenaga Nasional (UNITEN), 43000, Kajang, Malaysia; Institute of Power Engineering, Universiti Tenaga Nasional, Kajang, 43000, Selangor, Malaysia. Electronic address: [email protected]
  • 3 Sunway Centre for Electrochemical Energy and Sustainable Technology (SCEEST), School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, 47500, Petaling Jaya, Selangor, Malaysia; Department of Chemical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne, Victoria, 3010, Australia. Electronic address: [email protected]
  • 4 Sunway Centre for Electrochemical Energy and Sustainable Technology (SCEEST), School of Engineering and Technology, Sunway University, No. 5 Jalan Universiti, Bandar Sunway, 47500, Petaling Jaya, Selangor, Malaysia; Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India; Centre of Research Impact and Outcome, Chitkara University, Punjab, 140401, India. Electronic address: [email protected]
Chemosphere, 2024 Apr;354:141593.
PMID: 38460854 DOI: 10.1016/j.chemosphere.2024.141593

Abstract

This study presents an innovative method for synthesizing activated carbon with an exceptionally high surface area (3359 m2 g-1) using kenaf fiber-based biochar through chemical activation. The achieved specific surface area surpasses activated carbon derived from other reported fiber-based precursors. The resulting activated carbon was investigated as electrodes for supercapacitors, revealing a remarkable maximum capacitance of 312 F g-1 at a current density of 0.5 A g-1. An aqueous symmetric supercapacitor employing these high-surface-area electrodes exhibited an outstanding energy density of 18.9 Wh kg-1 at a power density of 250 W kg-1. Notably, the supercapacitor retained exceptional capacitance, maintaining 93% of its initial capacitance even after 5000 charge-discharge cycles.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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