Supercapacitors (electrochemical capacitors)

Conder, Joanna; Fic, Krzysztof; Ghimbeu, Camélia Matei

doi:10.1016/b978-0-12-814893-8.00010-9

Cited by 6 publications

(6 citation statements)

References 223 publications

(266 reference statements)

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“…This behavior was attributed to the presence of quinone groups on the surface that may bring pseudocapacitance into the system. 39 Moreover, the trend observed in the specific capacities of all the samples matches well with the results obtained for the microporous area and microporous volume (Figure 2c), in which it is evidenced that AC-10% possesses both the higher microporous area and micropore volume. In addition, the high phase angle observed for the AC-10% sample also reveals an improved mass/charge transfer through the porous layer.…”

Section: Electrochemical Characterizationsupporting

confidence: 86%

“…These efforts include exploring the precursor composition, pyrolysis temperature, activating agent, precursor to activating agent molar ratio, and other factors. 38,39 Potassium hydroxide (KOH) is one of the most commonly used activating agent because of its ability to produce microporous 40 and promote the formation of oxygenated groups (e.g., C = O) on the AC surface. 41 Moreover, although the key role of the carbonaceous texture, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, some researchers have been working on improving the conditions for synthesizing ACs. These efforts include exploring the precursor composition, pyrolysis temperature, activating agent, precursor to activating agent molar ratio, and other factors. , Potassium hydroxide (KOH) is one of the most commonly used activating agent because of its ability to produce microporous and promote the formation of oxygenated groups (e.g., C = O) on the AC surface …”

Section: Introductionmentioning

confidence: 99%

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Activated Carbon Electrodes for Supercapacitors from Purple Corncob (Zea mays L.)

Huarote-Garcia,

Cardenas-Riojas,

Monje

et al. 2024

ACS Environ. Au

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Activated carbon-based supercapacitor electrodes synthesized from biomass or waste-derived biomass have recently attracted considerable attention because of their low cost, natural abundance, and power delivery performance. In this work, purplecorncob-based active carbons are prepared by KOH activation and subsequently evaluated as a composite electrode for supercapacitors using either an acidic or an alkali solution as the electrolyte. The synthesis of the material involves mixing the purple corncob powder with different concentrations of KOH (in the range of 5% to 30%) and a thermal treatment at 700 °C under an inert atmosphere. Physicochemical characterizations were performed using scanning electron microscopy, Raman spectroscopy, N 2 physisorption analysis, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, while the electrochemical characteristics were determined using cyclic voltammetry, a galvanostatic charge/discharge curve, and electrochemical impedance techniques measured in a three-and two-electrode system. Composite electrodes activated with 10% KOH had a specific surface area of 728 m 2 g −1 , and high capacitances of 195 F g −1 at 0.5 A g −1 in 1 mol L −1 H 2 SO 4 and 116 F g −1 at 0.5 A g −1 in 1 mol L −1 KOH were obtained. It also presented a 76% capacitance retention after 50 000 cycles. These properties depend significantly on the microporous area and micropore volume characteristics of the activated carbon. Overall, our results indicate that purple corncob has an interesting prospect as a carbon precursor material for supercapacitor electrodes.

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Section: Electrochemical Characterizationsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Activated Carbon Electrodes for Supercapacitors from Purple Corncob (Zea mays L.)

Huarote-Garcia,

Cardenas-Riojas,

Monje

et al. 2024

ACS Environ. Au

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“…The success of the electrochemical results is attributed to the natural lignocellulosic fibers in C. sativa that can achieve a high rate capability due to the nature of the open-pore system that enables homogeneous electrical contact to accelerate the motion of electrons and pave the pathway for ion mobility through the interior of the electrode [31,51,52]. These works prove that the C. sativa-derived activated carbons can serve as robust, active supports for metal oxides in pseudocapacitors to enhance the internal redox activity and confirm the success of a synergistic relationship between the two materials.…”

Section: Supercapacitorsmentioning

confidence: 99%

A new high: Cannabis as a budding source of carbon-based materials for electrochemical power sources

Rana

Shah

Llewellyn

et al. 2022

Current Opinion in Electrochemistry

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“…Furthermore, biomass-derived carbon tends to have functional groups, which interact directly with the electrolyte, causing protonation or deprotonation on the surface [51]. In the case of the KOH electrolyte, its surface is smoothed by the acidic O-groups into carboxylic groups during prolonged cycling; however, compared to other electrolytes, a more stable capacitance and cycling is obtained [51,52]. Regarding the electrochemical performance, the values obtained were lower than those reported in other studies; however, a competitive surface area with respect to what has already been researched was obtained, which was due to the porosity achieved by hydrothermal treatment.…”

Section: Electrochemical Behavior Tested In a Three-electrode Systemmentioning

confidence: 99%

Revalorization of Pleurotus djamor Fungus Culture: Fungus-Derived Carbons for Supercapacitor Application

et al. 2021

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Currently, there is increasing interest and effort directed to developing sustainable processes, including in waste management and energy production and storage, among others. In this research, corn cobs were used as a substrate for the cultivation of Pleurotus djamor, a suitable feedstock for the management of these agricultural residues. Revalorization of this fungus, as an environmentally friendly carbon precursor, was executed by taking advantage of the intrinsic characteristics of the fungus, such as its porosity. Obtaining fungus-derived porous carbons was achieved by hydrothermal activation with KOH and subsequent pyrolysis at 600, 800, and 1000 °C in an argon atmosphere. The morphologies of the fungal biomass and fungus-derived carbons both exhibited, on their surfaces, certain amorphous similarities in their pores, indicating that the porous base matrix of the fungus was maintained despite carbonization. From all fungus-derived carbons, PD1000 exhibited the largest superficial area, with 612 m2g−1 and a pore size between 3 and 4 nm recorded. Electrochemical performance was evaluated in a three-electrode cell, and capacitance was calculated by cyclic voltammetry; a capacitance of 60 F g−1 for PD1000 was recorded. Other results suggested that PD1000 had a fast ion-diffusion transfer rate and high electronic conductivity. Ultimately, Pleurotus djamor biomass is a suitable feedstock for obtaining carbon in a sustainable way, and it features a defined intrinsic structure for potential energy storage applications, such as electrodes in supercapacitors.

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Supercapacitors (electrochemical capacitors)

Cited by 6 publications

References 223 publications

Activated Carbon Electrodes for Supercapacitors from Purple Corncob (Zea mays L.)

Activated Carbon Electrodes for Supercapacitors from Purple Corncob (Zea mays L.)

A new high: Cannabis as a budding source of carbon-based materials for electrochemical power sources

Revalorization of Pleurotus djamor Fungus Culture: Fungus-Derived Carbons for Supercapacitor Application

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