Preparation of Hierarchical Porous Activated Carbon from Banana Leaves for High-performance Supercapacitor: Effect of Type of Electrolytes on Performance

Chanchal Kumar Roy; Syed Shaheen Shah; Akter H Reaz; Sharmin Sultana; Al-Nakib Chowdhury; Shakhawat H Firoz; Md Hasan Zahir; Mohammed Ameen Ahmed Qasem; Md Abdul Aziz

doi:10.1002/asia.202001342

Preparation of Hierarchical Porous Activated Carbon from Banana Leaves for High-performance Supercapacitor: Effect of Type of Electrolytes on Performance

Chem Asian J. 2021 Feb 15;16(4):296-308. doi: 10.1002/asia.202001342. Epub 2021 Jan 19.

Authors

Chanchal Kumar Roy¹, Syed Shaheen Shah², Akter H Reaz¹, Sharmin Sultana¹, Al-Nakib Chowdhury¹, Shakhawat H Firoz¹, Md Hasan Zahir³, Mohammed Ameen Ahmed Qasem², Md Abdul Aziz²

Affiliations

¹ Department of Chemistry, Bangladesh University of Engineering and Technology, 1000, Dhaka, Bangladesh.
² Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, 31261, Dhahran, Saudi Arabia.
³ Center of Research Excellence in Renewable Energy, King Fahd University of Petroleum & Minerals, 31261, Dhahran, Saudi Arabia.

PMID: 33237636
DOI: 10.1002/asia.202001342

Abstract

We demonstrate a facile efficient way to fabricate activated carbon nanosheets (ACNSs) consisting of hierarchical porous carbon materials. Simply heating banana leaves with K₂ CO₃ produce ACNSs having a unique combination of macro-, meso- and micropores with a high specific surface area of ∼1459 m² g^-1 . The effects of different electrolytes on the electrochemical supercapacitor performance and stability of the ACNSs are tested using a two-electrode system. The specific capacitance (C_sp ) values are 55, 114, and 190 F g^-1 in aqueous 0.5 M sodium sulfate, organic 1 M tetraethylammonium tetrafluoroborate in acetonitrile, and pure ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF₆ ]) electrolytes, respectively. The ACNSs also shows the largest potential window of 3.0 V, the highest specific energy (59 Wh kg^-1 ) and specific power (750 W kg^-1 ) in [BMIM][PF₆ ]. A mini-prototype device is prepared to demonstrate the practicality of the ACNSs.

Keywords: 1-butyl-3-methylimidazolium hexafluorophosphate; Activated porous carbon nanosheets; Banana leaves; Energy storage; Mesoporous materials; Symmetric supercapacitor; Tetraethylammonium tetrafluoroborate/acetonitrile.

Abstract

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