Activated carbon from wasp hive for aqueous electrolyte supercapacitor application

[Display omitted] •Hierarchical interconnected porous activated carbon from wasp hive was produced.•A surface area of 765 m2/g and a pore size of 2.4 nm was obtained.•225F/g and 5.33 Wh/kg at 0.25 A/g was achieved in H2SO4 electrolyte.•The W800-3 retained 83.6% of original capacitance after 5000 cyc...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-11, Vol.901, p.115777, Article 115777
Main Authors: Lobato-Peralta, Diego Ramón, Amaro, Rayko, Arias, D.M., Cuentas-Gallegos, Ana Karina, Jaramillo-Quintero, Oscar Andrés, Sebastian, P.J., Okoye, Patrick U.
Format: Article
Language:English
Subjects:
Activated carbon
Amorphous materials
Aqueous electrolytes
Capacitance
Electrodes
Electrolyte
Electrolytes
Electrolytic cells
Energy storage
Potassium carbonate
Supercapacitors
Surface properties
Wasp-hive
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Summary:[Display omitted] •Hierarchical interconnected porous activated carbon from wasp hive was produced.•A surface area of 765 m2/g and a pore size of 2.4 nm was obtained.•225F/g and 5.33 Wh/kg at 0.25 A/g was achieved in H2SO4 electrolyte.•The W800-3 retained 83.6% of original capacitance after 5000 cycles. In this work, a honeycomb-like hierarchical porous activated carbon derived from a sustainable wasp hive was produced by single-step chemical activation with potassium carbonate (K2CO3) as an activating agent at 800 °C for 1 h. The activated carbon was tested as a supercapacitor electrode for energy storage. The chemical activation with K2CO3 tailored the topography and surface properties to realize an amorphous macro-meso-microporous activated carbon material with a specific surface area of 765 m2/g and an average pore diameter of 2.4 nm. The highest specific capacitance (225 F/g) in 3-electrode cells was obtained in an acid electrolyte, whereas the neutral and alkaline electrolytes have lower specific capacitance. The wasp hive activated carbon electrode presented specific energy of 5.33 Wh/kg at 0.25 A/g, which exceeds the specific energy of a commercial activated carbon at the same conditions. About 100% coulombic efficiency was achieved with capacitance retention of 83.6% after 5000 charge/discharge cycles.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2021.115777