Activated biomass-derived 3-dimensional porous graphene-like carbon for high-performance energy storage electrode materials
Beissenov R. Duisenbek A. Beisenova Y. Askaruly K. Yeleuov M. Abdisattar A.
November 2024Elsevier Ltd
Diamond and Related Materials
2024#149
This article reports studies on the fabrication of active material for supercapacitor electrodes, from 3D porous graphene-like carbon (GLC), synthesized by carbonization from coffee waste (CW) and tea waste (TW) at 550 °C, followed by thermochemical activation in KOH at 850 °C in a quartz tubular furnace. The microstructure of coffee and tea waste shows the form of micro- and mesopores during carbonization and further chemical activation forms hierarchically highly porous 3D graphene-like carbon. GLC-CW exhibited a higher specific surface area (SSA) of 3486 m2/g according to the Brunauer-Emmett-Teller (BET) method, compared to GLC-TW, which had an SSA of 2407 m2/g. These results highlight the effectiveness of graphene-like carbon derived from coffee and tea waste, demonstrating its potential as a promising material for high-capacity supercapacitors. The electrochemical characteristics of the assembled supercapacitors using GLC-CW and GLC-TW revealed significantly higher specific capacitance values of 214 F/g and 182 F/g respectively, along with cycling stability of 98 % and 95 % during 5000 cycles of charge and discharge at 2 A/g current density. This approach can produce high-performance electrode materials for supercapacitors at a reasonable cost and with easy scalability.
Activated carbon , Biomass , Carbonization , Coffee waste , Energy storage , Tea waste , Thermochemical activation
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Kazakh-British Technical University, Almaty, Kazakhstan
The Institute of Combustion Problems, Almaty, Kazakhstan
Satbayev University, Almaty, Kazakhstan
Kazakh-British Technical University
The Institute of Combustion Problems
Satbayev University
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