KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

Chaitra, K.; Vinny, R.T.; Sivaraman, P.; Reddy, Narendra; Hu, Chunyan; Venkatesh, Krishna; Vivek, C.; Nagaraju, N.; Nagaraju, Kathyayini

doi:10.1016/j.jechem.2016.07.003

Cited by 63 publications

(1 citation statement)

References 38 publications

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“…Another team investigated the output of ACs formulated from fruit aridity bio wastes for SC utilization by deploying physical and chemical processes [72,[93][94][95][96], and the performance of ACs electrode synthesised from two varying dried fruit left-overs via a hydrothermal carbonization-HTC at 250°C for 30 minutes under nitrogen, then further activated at 900°C with phosphoric acid to create ACs and chemical activation process is investigated in this study. The two commercial fruit dehydration wastes produced ACs (AC-CSOS & AC-BSOS) are with varied pore properties, with the AC-CSOS having a bigger number of microporosity diversity and a enhanced surface area compared to the AC-BSOS.…”

Section: For the Field Emission Scanning Electron Microscopy-(fesem) ...mentioning

confidence: 99%

Investigation of Several Bio Wastes as Sustainable Carbon Materials for Supercapacitor Manufacturing

Jerome, F. N.,

Obiukwu, O. O.,

Okonkwo, B. U.

et al. 2024

AJOCR

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This work presents various inquests on the utilization of bio wastes, agricultural wastes and sea shells to develop activated carbon as a veritable and sustainable electrode (terminals) substance for supercapacitors-(SC) also known as electrochemical double layer capacitors (EDLC) gadgets for preserving energy. We also looked at how electrode materials are processed with a view to improve or maximise the supercapacitor performance. This review entails how several bio wastes has been singed, synthesized and utilized to produce activated carbon material for long lasting, low-cost and environmentally-friendly EDLCs via the processes of pyrolysis, carbonization, physical activation and/or chemical activation with reagents and then characterized to show attributes making them suitable for application in supercapacitor manufacturing. Some of the features making the samples suitable for use as EDLC electrode materials include pore structure, very large surface area, power density, energy density, pore volume, cyclic stability specific capacitance, iodine adsorption with other attributes. This work also showcases how the various properties were determined by different tests including Brunauer-Emmett-Teller-(BET), Fourier Transform Infrared-(FTIR) Spectrometry, Field Emission Scanning Electron Microscopy-(FESEM), Raman-Spectroscopy, Scanning Electron Microscopy-(SEM), Energy Dispersive X-Ray-(EDX), X-Ray Diffraction-(XRD), TGA-Thermo-Gravimetric Analysis, Cyclic Voltammetry-(CV), Transmission Electron Microscopy-(TEM), and other procedures.

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Section: For the Field Emission Scanning Electron Microscopy-(fesem) ...mentioning

confidence: 99%

Investigation of Several Bio Wastes as Sustainable Carbon Materials for Supercapacitor Manufacturing

Jerome, F. N.,

Obiukwu, O. O.,

Okonkwo, B. U.

et al. 2024

AJOCR

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Robust Negative Electrode Materials Derived from Carbon Dots and Porous Hydrogels for High‐Performance Hybrid Supercapacitors

et al. 2018

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3-5 folds or more amounts of carbon materials are required to fill the capacitance gap between the positive/negative electrodes, which finally restrict the whole energy densities of the devices. To improve electrochemical capacitances of carbon materials, three main strategies have been investigated thoroughly: enlarging specific surface areas, [19] constructing porous structures, [20,21] and introducing pseudocapacitive reactions. [22] But each strategy is not perfect. When the surface areas and the pore volumes are improved, the tap densities of electrodes will be reduced. Moreover, enhancing pseudocapacitance by modifying too many functional groups will decrease the whole conductivity and stability of electrode materials. [23] In the present work, we suggest a new concept of building electron-rich regions on the electrode surface, so as to adsorb more cations and accelerate the charge transfer. As a result, the capacitance of carbon materials will be increased reasonably without sacrificing the density, conductivity, and stability of the whole electrode. However, this idea brings a new challenge because the desired groups with abundant electrons (like phosphate groups) are usually difficult to be modified on the carbon materials. In order to resolve this problem, we used carbon dots (CDs, sub-10 nm) [24,25] with desired groups as the guest, and the commercial polyacrylamide (PAM) hydrogel as the host. After calcination on the host-guest composites, we obtained new carbon frameworks which have abundant electron-rich regions, large surface areas, and appropriate porous structures in the meantime. The optimal sample exhibits a specific capacitance up to 468, 510, and 438 F g −1 in alkaline, acidic, and neutral electrolytes, respectively. When it is fabricated into a hybrid supercapacitors with the positive electrode material Ni(OH) 2 /CNTs using an alkaline electrolyte, the mass ratio of positive/negative electrodes is less than 2, an energy density over 90 Wh kg −1 is realized successfully, and 100% of capacity retention rate is recorded after 10 000 cycles. This material also shows excellent performances in both acidic (PbO 2 as positive electrode) and neutral (LiMn 2 O 4 as positive electrode) systems. Detailed structural characterizations and theoretical calculations prove that the well-preserved phosphate/nitrogen groups from the CDs precursors can effectively modulate the electronic structure and form electron-rich regions on the electrode Hybrid supercapacitors generally show high power and long life spans but inferior energy densities, which are mainly caused by carbon negative electrodes with low specific capacitances. To improve the energy densities, the traditional methods include optimizing pore structures and modifying pseudocapacitive groups on the carbon materials. Here, another promising way is suggested, which has no adverse effects to the carbon materials, that is, constructing electron-rich regions on the electrode surfaces for absorbing cations as much as possible. For this aim, a series of hi...

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Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

et al. 2019

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KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

Cited by 63 publications

References 38 publications

Investigation of Several Bio Wastes as Sustainable Carbon Materials for Supercapacitor Manufacturing

Investigation of Several Bio Wastes as Sustainable Carbon Materials for Supercapacitor Manufacturing

Robust Negative Electrode Materials Derived from Carbon Dots and Porous Hydrogels for High‐Performance Hybrid Supercapacitors

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

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