Journal
JOURNAL OF ENERGY STORAGE
Volume 40, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.102823
Keywords
Hierarchical porous; Activated carbon; Banana leaves; Electrode materials; Supercapacitor
Categories
Funding
- first year Project of Word Class Research (WCR) in DRPM Kemenristek/BRIN, Republic of Indonesia [474/UN.19.5.1.3/PT.01.03/2021]
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This research successfully converted banana leaves biomass into porous carbon without using complicated techniques, such as hard/salt-templates or heteroatoms-doping. The obtained activated carbon exhibited a 3D porous structure with enhanced specific surface area and mesoporosity, leading to the production of high-capacity symmetric supercapacitors. This study provided a feasible approach to obtain hierarchical activated porous carbon as an electrode material for energy storage devices.
A practical and effective approach is needed to obtain micro-meso porous carbon in order to enhance electrode materials performance as energy storage applications. Therefore, this research aims at converting banana leaves biomass as a precursor into porous carbon via potassium hydroxide impregnation and physical activation at varying temperatures in the range of 700-900 degrees C. Most importantly, in this research, porous carbon is hierarchically prepared without complicated techniques such as hard/salt-templates, heteroatoms-doping, metal framework, or using graphene/metal oxides. Furthermore, the activated carbon is exhibited in the form of a binder-free coin/monolith solid design with the 3D porous structure clearly observed to determine the suitable micro/meso combinations. More importantly, activated carbon enhances the specific surface area of 623.491 m(2) g(-1) using a high temperature and mesoporosity value of 46%. Therefore, the symmetric supercapacitor produced a high specific capacitance of 245 F g(-1) in an acid electrolyte of 1 M H2SO4 and 211 F g(-1) in an alkaline electrolyte of 6 M KOH. The result showed that the hierarchical porous activated carbon based on banana leaf waste increases the specific energy by 34.67 Wh kg(-1) with a specific power of 97.68 Wh kg(-1). In conclusion, this utilized an effectively feasible approach to obtaining biomass-based hierarchical activated porous carbon as an electrode material for energy storage devices.
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