Investigation of different aqueous electrolytes on the electrochemical performance of activated carbon-based supercapacitors

Barzegar, Farshad; Momodu, Damilola Y.; Fashedemi, Omobosede O.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Manyala, Ncholu I.

doi:10.1039/c5ra21962k

Cited by 87 publications

(45 citation statements)

References 37 publications

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“…(a-c) CV plots of ACB-1 sample in different electrolytes at different activation temperatures (d) CV plotshowing reversibility of ACB-1 700 material electrode in Na 2 SO 4 aqueous electrolyte response in Na 2 SO 4 is attributed to its unique properties such as the hydration sphere radius, ionic mobility, the electrolyte pH-value, conductivity etc. as reported in earlier studies[48][49][50] on activated carbon materials for both alkaline and neutral electrolytes.In addition, all CV plots of the sample electrodes carbonized at 700 °C show the highest current response, indicating superior capacitance and an optimum carbonization temperature of 700 °C for the ACB material. To further confirm this assertion made based on the current response in relation to capacitance, the galvanostatic charge-discharge (GCD)…”

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confidence: 72%

Activated carbon derived from tree bark biomass with promising material properties for supercapacitors

Momodu

Madito

Barzegar

et al. 2016

J Solid State Electrochem

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Activated carbon from tree bark (ACB) has been synthesized by a facile and environmentally friendly activation and carbonization process at different temperatures (600, 700, and 800 °C) using potassium hydroxide (KOH) pellets as an activation agent with different mass loading. The physicochemical and microstructural characteristics of the as-obtained material revealed interconnected micro/mesoporous architecture with increasing trend in specific surface area (SSA) as carbonization temperatures rises. The SSA values of up to 1018 m 2 g -1 and a high pore volume of 0.67 cm 3 g -1 were obtained. The potential of the ACB material as suitable supercapacitor electrode was investigated in both a three and two electrode configuration in different neutral aqueous electrolytes. The electrodes exhibited EDLC behaviour in all electrolytes with the Na 2 SO 4 electrolyte working reversibly in both the negative (-0.80 V to -0.20 V) and positive (0.0 V to 0.6 V) operating potentials. A specific capacitance (C S ) of up to 191 F g -1 at a current density of 1 A g -1 was obtained for the optimized ACB electrode material in 1 M Na 2 SO 4 electrolyte. A symmetric device fabricated exhibited specific C S of 114 F g -1 at 0.3 A g -1 and excellent stability with a coulombic efficiency of a 100% after 5000 constant charge-discharge cycles at 5.0 A g -1 and a low capacitance loss for a floating time of 70 h.

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confidence: 72%

Activated carbon derived from tree bark biomass with promising material properties for supercapacitors

Momodu

Madito

Barzegar

et al. 2016

J Solid State Electrochem

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“…These are significant considering that this is arising from the double‐layer capacitance formed by the Na + ions at the Cu 2 P 2 O 7 surface (Figure C) . Notably, there was no psuedocapacitiative behavior at the Cu 2+ sites, which in principle could cause sample degradation (Supporting Information, Figures S52, S54, S55).…”

Section: Methodsmentioning

confidence: 99%

Facile Exfoliation of Single‐Crystalline Copper Alkylphosphates to Single‐Layer Nanosheets and Enhanced Supercapacitance

et al. 2019

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Manipulation of low‐dimensional solids through soft chemical routes is an elegant way to realize newer materials. A new family of single‐crystalline transition‐metal layered organophosphates, with about 185 000 metal phosphate layers in a single crystal, can be exfoliated to a single‐layer nanosheet by a facile and rapid solvent assisted method. This exfoliation aids the formation of high‐surface‐area pyrophosphates with enhanced supercapacitance.

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“…An electrochemical workstation, CH‐Instruments (CHI600E), was used for electrochemical characterizations at RT. The 6 m KOH electrolytic solution was used for analysis . The 0–0.9 V potential window was implemented for GCD and CV analyses.…”

Section: Methodsmentioning

confidence: 99%

Waste‐Derived Heteroatom‐Doped Activated Carbon/Manganese Dioxide Trio‐Composite for Supercapacitor Applications

2020

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The utilization of biological‐waste materials to synthesize heteroatom‐doped activated carbon (AC), followed by metal oxide functionalization for high‐performance supercapacitors is described. Herein, easily available and cheap biowaste, i.e., cow dung (CD), and low priced‐nontoxic waste melamine sponge (MS) are consumed to produce nitrogen‐doped AC followed by functionalization with economically inexpensive manganese dioxide (MnO2), that is utilized to provide an efficient energy‐storage material. The use of CD, MS, and MnO2 materials furnishes the process with sustainability, cost‐effectiveness, and safe components for the doping of heteroatoms and metal oxide on the carbon framework for energy‐storage applications. The subsequent material exhibits maximum specific capacitance, i.e., 424 F g−1, at a current density of 1 A g−1, which relates to maximum power as well as the energy density of 1817 W kg−1 and 47.7 Wh kg−1, respectively. The resultant material shows high‐performance specific capacitance and excellent cyclic stability for supercapacitor applications. This modest process of the direct production of N‐doped AC followed by MnO2 functionalization is a simple, economical, large production of a nanomaterial prototype for different applications including supercapacitor applications.

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Investigation of different aqueous electrolytes on the electrochemical performance of activated carbon-based supercapacitors

Cited by 87 publications

References 37 publications

Activated carbon derived from tree bark biomass with promising material properties for supercapacitors

Activated carbon derived from tree bark biomass with promising material properties for supercapacitors

Facile Exfoliation of Single‐Crystalline Copper Alkylphosphates to Single‐Layer Nanosheets and Enhanced Supercapacitance

Waste‐Derived Heteroatom‐Doped Activated Carbon/Manganese Dioxide Trio‐Composite for Supercapacitor Applications

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