A comparative study on electrochemical performance of KOH activated carbons derived from different biomass sources - Musa acuminata stem, Pongamia pinnata seed oil extract cake, cajanus cajan stem and Asclepias syriaca floss

• DOI: 10.1016/j.heliyon.2023.e15399
• Publication Date: 2023-04-18T08:26:19Z
• Authors: Gopalakrishna Bya...; Radhika M. G; Srilakshmi R; Tejashree V; Krishna Venkatesh; Nagaraju N; Kathyayini Nagaraju
• Keywords: Pongamia; Cajanus

In the present scenario of research, recycling inexpensive widely available agricultural waste/biowaste to activate carbon (AC) and procurement value-added product has significant impact on energy storage systems, particularly in Electrochemical double layer capacitors (EDLCs). Herein, we report production KOH activated carbons from different biomass sources such as Musa Acuminata stem (MAC), Pongamia pinnata seed oil extract cake (PPC), Cajanus Cajan (CCC) Asclepias syriaca floss (ASC) for said purpose. Initially, materials were pyrolyzed at 550 °C then with 800 °C. All characterized their physico-chemical properties by various analytical techniques compared. Further, these studied electrochemical performance using suitable electro-analytical 1 M solution. ACs (Activated carbons) derived MAC, PPC, CCC & ASC estimated three electrode system found exhibit a specific capacitance (Cs) 358, 343, 355 540 F/g scan rate 2 mV/s 102, 188, 253 256 current density 2.5 A/g respectively. The main novel objective this work is correlate morphological surface obtained performance. A symmetric coin cell constructed material exhibited Cs 67 maximum power densities (ED PD) 37.2 W h/kg 19.9 kW/kg Further showed 25,000 cycles stability 86% retention 100% coulombic efficiency.