On the causes of non-linearity of galvanostatic charge curves of electrical double layer capacitors

Esarev, Igor V.; Агафонов, Д. В.; Surovikin, Yuri V.; Несов, С. Н.; Лавренов, А. В.

doi:10.1016/j.electacta.2021.138896

Cited by 12 publications

(3 citation statements)

References 26 publications

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“…The GCD curve (Figure b) shows that in the potential window range of 0–0.5 V, all charge and discharge curves show nonlinear characteristics and the pseudocapacitance characteristics are reflected in combination with the voltage platform on the GCD curve . These voltage platforms on the GCD curve are mainly caused by reversible redox reactions on the surface of electrode material, and these voltage platforms coincide with the peak positions on the CV curve, respectively. This agrees well with the CV curve in Figure a.…”

Section: Resultsmentioning

confidence: 92%

Boosting the Electrochemical Storage Properties of Co₃O₄ Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Wang,

Zhang,

Duan

et al. 2024

ACS Omega

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High specific capacitance, high energy density, and high power density have always been important directions for the improvement of electrode materials for supercapacitors. In this paper, Co 3 O 4 nanowire arrays with various Mn doping concentrations (Mn:Co molar ratio = 1:11, 1:5, 1:2) directly grown on nickel foam (NF) were prepared by a simple hydrothermal method and annealing process. The influence of Mn doping on the morphology, structure, and electrochemical behaviors of Co 3 O 4 was investigated. The results show that partial substitution of Co ions with Mn ions in the spinel structure does not change the nanowire morphology of pure Co 3 O 4 but increases the lattice parameter and decreases the crystallinity of cobalt oxide. Electrochemical measurements showed that Mn doping in Co 3 O 4 could effectively enhance the redox activity, especially Co 3 O 4 with a Mn doping ratio of 1:5, which exhibits the most excellent electrochemical performance, with the maximum specific capacitance of 1210.8 F•g −1 at 1 A•g −1 and a rate capability of 33.0% at 30 A•g −1 . The asymmetric supercapacitor (ASC) device assembled with the optimal Mn−Co 3 O 4 (1:5) and activated carbon (AC) electrode performs a high specific capacitance of 105.8 F•g −1 , a high energy density of 33 Wh•kg −1 at a power density of 748.1 W•kg −1 , and a capacitance retention of 60.2% after 5000 cycles. This work indicates that an appropriate Mn doping concentration in the Co 3 O 4 lattice structure will have great potential in rationalizing the design of spinel oxides for efficient electrochemical performance.

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Section: Resultsmentioning

confidence: 92%

Boosting the Electrochemical Storage Properties of Co₃O₄ Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Wang,

Zhang,

Duan

et al. 2024

ACS Omega

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“…The CV curves also indicate the presence of small redox peaks and therefore, in accordance with the GCD results. Apart from the Faraday processes on the electrode surface, the internal resistance at the electrode–electrolyte interface, charge redistribution from the electrode surface into the bulk solid, and porosity of the electrode material may also induce deviations from the linearity and trailing profiles of the GCD curves. , The specific capacitances of all the tested electrode materials are calculated from the GCD curves, as shown in Figure i. The specific capacitance of AMO/MWCNT-in electrode is 580.2 F g –1 at 1.0 A g –1 , which is significantly larger than the AMO-S (334.0 F g –1 ) and AMO/MWCNT-ex (396.5 F g –1 ) electrodes at the same current density.…”

Section: Resultsmentioning

confidence: 99%

Amorphous MnO_x Nanostructure/Multiwalled Carbon Nanotube Composites as Electrode Materials for Supercapacitor Applications

Keshari

Dubey

2022

ACS Appl. Nano Mater.

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Disordered nanostructures with abundant defects and porous microstructures have drawn tremendous interest in the energy storage application. Herein, a simple synthesis of amorphous MnO x nanostructures (AMO-S) is demonstrated by a redox reaction between carbon dots (CD-S, derived from sucrose via hydrothermal method) and KMnO 4 at room temperature. The obtained AMO-S displays a nanoparticulate/nanorod-like irregular morphology and mesoporous structure. Experimental observations illustrate that the presence of CD-S is essential for the precipitation of AMO-S under ambient conditions. Afterward, a small amount of multiwalled carbon nanotubes (MWCNTs) is incorporated before (in situ) and after (ex situ) the formation of AMO-S, which resulted in AMO/MWCNT-in and AMO/MWCNT-ex nanocomposites, respectively. Electrochemical tests of the synthesized materials are conducted to evaluate their charge storage characteristics. It is found that the AMO/MWCNT-in nanocomposite with a small MWCNT content (∼3.0 wt %) exhibits a high specific capacitance of 580.2 F g −1 at 1.0 A g −1 based on the total mass of electrode material, promising rate capability (57.1% retention after 6-fold increase in the current density), and high cycling stability (96.9% @ 3000 charge−discharge cycles at 1.0 A g −1 ). The excellent electrochemical performance of the AMO/MWCNT-in electrode is mainly attributed to the better intermixing of two components along with the synergistic contributions of CD-S, resulting in a high electronic conductivity, fast ion diffusion ability, abundant electroactive sites, and mesoporosity. Moreover, the assembled aqueous AMO/MWCNT-in//activated carbon asymmetric supercapacitor can work properly in a significantly large potential window of 0−2.2 V, which delivers a high specific capacitance (76.2 F g −1 @ 1.0 A g −1 ) and excellent energy density (51.2 Wh kg −1 ) at a power density of 1100 W kg −1 . This study suggests that the in situ incorporation of a small amount of MWCNTs may be an effective approach to improve the energy storage ability of pseudocapacitive AMO-S.

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“…The formation of electrical double layer of electrolyte ions on the surface of meso-and macropores was relatively easy but the electrolyte ions had difficulty to transport into micropores and access their surface for charge storage, which led to deviation from the linearity of charging. The meso-microporous electrode material is ideal for the supercapacitor designed for the accumulation of maximum capacity and operation in relatively long-time range [36].…”

Section: Two-electrode Analysismentioning

confidence: 99%

Meso-Microporous Carbon Nanofibrous Aerogel Electrode Material with Fluorine-Treated Wood Biochar for High-Performance Supercapacitor

Hasan,

Asare,

Mantripragada

et al. 2024

Gels

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A supercapacitor is an electrical energy storage system with high power output. With worldwide awareness of sustainable development, developing cost-effective, environmentally friendly, and high-performance supercapacitors is an important research direction. The use of sustainable components like wood biochar in the electrode materials for supercapacitor uses holds great promise for sustainable supercapacitor development. In this study, we demonstrated a facile and powerful approach to prepare meso-microporous carbon electrode materials for sustainable and high-performance supercapacitor development by electrospinning polyacrylonitrile (PAN) with F-treated biochar and subsequent aerogel construction followed by stabilization, carbonization, and carbon activation. The resultant carbon nanofibrous aerogel electrode material (ENFA-FBa) exhibited exceptional specific capacitance, attributing to enormously increased micropore and mesopore volumes, much more activated sites to charge storage, and significantly greater electrochemical interaction with electrolyte. This electrode material achieved a specific capacitance of 407 F/g at current density of 0.5 A/g in 1 M H2SO4 electrolyte, which outperformed the state-of-the-art specific capacitance of biochar-containing electrospun carbon nanofibrous aerogel electrode materials (<300 F/g). A symmetric two-electrode cell with ENFA-FBa as electrode material showed an energy density of 11.2 Wh/kg at 125 W/kg power density. Even after 10,000 cycles of charging-discharging at current density of 10 A/g, the device maintained a consistent coulombic efficiency of 53.5% and an outstanding capacitance retention of 91%. Our research pointed out a promising direction to develop sustainable electrode materials for future high-performance supercapacitors.

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On the causes of non-linearity of galvanostatic charge curves of electrical double layer capacitors

Cited by 12 publications

References 26 publications

Boosting the Electrochemical Storage Properties of Co₃O₄ Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Boosting the Electrochemical Storage Properties of Co₃O₄ Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Amorphous MnO_x Nanostructure/Multiwalled Carbon Nanotube Composites as Electrode Materials for Supercapacitor Applications

Meso-Microporous Carbon Nanofibrous Aerogel Electrode Material with Fluorine-Treated Wood Biochar for High-Performance Supercapacitor

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On the causes of non-linearity of galvanostatic charge curves of electrical double layer capacitors

Cited by 12 publications

References 26 publications

Boosting the Electrochemical Storage Properties of Co3O4 Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Boosting the Electrochemical Storage Properties of Co3O4 Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Amorphous MnOx Nanostructure/Multiwalled Carbon Nanotube Composites as Electrode Materials for Supercapacitor Applications

Meso-Microporous Carbon Nanofibrous Aerogel Electrode Material with Fluorine-Treated Wood Biochar for High-Performance Supercapacitor

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Product

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Boosting the Electrochemical Storage Properties of Co₃O₄ Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Boosting the Electrochemical Storage Properties of Co₃O₄ Nanowires by the Mn Doping Strategy with Appropriate Mn Doping Concentrations

Amorphous MnO_x Nanostructure/Multiwalled Carbon Nanotube Composites as Electrode Materials for Supercapacitor Applications