Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

Piñeiro-Prado, Isabel; Salinas-Torres, David; Ruiz-Rosas, Ramiro; Morallón, Emilia; Cazorla‐Amorós, Diego

doi:10.3389/fmats.2016.00016

Cited by 58 publications

(39 citation statements)

References 48 publications

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“…[42][43][44] If mass on both electrodes did not match with each other, the potential of one electrode should firstly reach a limit to ensure charge equalization, resulting in waste in working potentials of the opposite electrode. [42,45,46] Hence, the narrowing of potential window of the negative electrode (Figure 8c) should be related to mass ratio of electrodes in RuO 2 //RuO 2 .…”

Section: Resultsmentioning

confidence: 97%

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Wang

Guo

et al. 2020

ChemElectroChem

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In this study, a stepwise cyclic voltammetry approach was proposed to clarify the potential dependence of specific capacitance for reduced graphene oxide and ruthenium oxide electrodes. Based on the relationship between specific capacitance and potential, the working voltage window and energy density of RuO2//RuO2 supercapacitors (SCs) were maximized by modulating the mass ratio. The working voltage window of RuO2//RuO2 with a mass ratio of 2.03 (close to optimum mass ratio m+/m-OPTM=2.04 ) was extended by about 188 % when compared to that calculated at a mass ratio of 0.56. The former was equivalent to a 304 % increase in energy density. In addition, the source of wasted potential window of electrodes on RuO2//RuO2 was investigated in an effort to design and produce better SCs.

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Section: Resultsmentioning

confidence: 97%

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Wang

Guo

et al. 2020

ChemElectroChem

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“…The increase in the amount of gas adsorbed from the AC-BSOS to AC-CSOS, as seen in Figure 1, also verifies that there were specific surface area differences between AC-BSOS and AC-CSOS. Figure 1 also shows a sharp stepdown on the desorption part at p/ p 0~0 .4-0.5; therefore, it is valid to claim that the samples are mainly mesoporous and microporous and the contribution from macroporosity is very limited [9]. However, both AC-BSOS and AC-CSOS present a knee at the low adsorption pressure that indicates the pore size distribution is not narrow, and it also shows the development of some small size mesopores [33].…”

Section: Porosity Characteristicsmentioning

confidence: 85%

Performance of activated carbons synthesized from fruit dehydration biowastes for supercapacitor applications

Çiftyürek

Bragg

Oginni

et al. 2018

Env Prog and Sustain Energy

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This research documents variability in electrode performance of activated carbons (ACs) produced from two different commercial fruit dehydration wastes through hydrothermal carbonization and chemical activation pathway. Commercial spent osmotic solutions (SOSs) from blueberry dehydration (BSOS) and glycerated cherry dehydration (CSOS) waste materials were subjected to hydrothermal carbonization at 250°C under nitrogen conditions for 30 min to extract hydrochars. BSOS‐ and CSOS‐derived hydrochar powders were further activated using phosphoric acid at 900°C to produce ACs. Results showed that the two commercial fruit dehydration wastes resulted in ACs with different pore characteristics, where the AC‐CSOS showed a higher level diversity in mesoporosity in addition higher surface area once compared to AC‐BSOS. The produced ACs were utilized in a symmetrical electrical double layer supercapacitor (EDLCs) to measure their performance as an electrode. The EDLCs fabricated from AC‐CSOS delivered a higher level of performance, where these materials showed up to 48 F/g specific capacity. Overall, the AC electrodes derived from the SOSs were comparable to many bio‐derived electrodes used for EDLCs, but subsequent enhancement to surface chemistry and surface area is required to outperform some of the best ACs and engineered carbon materials in this application. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13030, 2019

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“…Corresponding to the same power density variation, the reported data fall within the range of 1 to 10 Wh kg −1 with most of them dispersed in the middle to high branch of this range. 8,[50][51][52] These strongly indicate the reasonability of Equations 5 and 6 used for the calculation of the energy densities and power densities, respectively.…”

Section: Charge / MCmentioning

confidence: 85%

High Temperature Monolithic Biochar Supercapacitor Using Ionic Liquid Electrolyte

Jiang

2017

J. Electrochem. Soc.

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A supercapacitor comprising of two binder-free biochar monolith electrodes and 1-butyl-3-methylimidazolium tetrafluoroborate based ionic liquid electrolyte was studied at room temperature and 140 • C by cyclic voltammetry, constant-current charge-discharge, and electrochemical impedance spectroscopy. The supercapacitor exhibits an operating voltage window of approximately 6 V. It is found that increasing temperature from room temperature to 140 • C considerably increases its specific mass capacity and its charge-discharge rate by a factor of approximately 10. The specific capacity of the supercapacitor calculated from the voltammetric measurements depended on scan rates. At 140 • C, a capacity of 21 F g −1 was obtained at 5 mV s −1 and this value decreases to around 10 F g −1 at 100 mV s −1 ; the constant-current charge-discharge profiles exhibit pseudo-linear voltage-time responses during the discharges. The supercapacitor shows good stability characteristics of no obvious performance decay after 1000 cycles within a voltage window of 6 V. Electrochemical impedance spectra of the supercapacitor display a wide linear region corresponding to diffusion control. The energy densities of the supercapacitor that are normalized to the total active electrode materials are higher than 20 Wh kg −1 when its power density is lower than 2000 W kg −1 . These facts suggest that the high-temperature biochar supercapacitor would be a promising energy-storage device with high energy and power density. Securing our energy future is the most important problem that humanity faces in this century. Electrochemical energy storage systems such as batteries and electrochemical capacitors (or supercapacitors) have been considered the most effective technologies for practical applications, 1,2 however, the battery front-runner, Li-ion batteries, suffer from a sluggish charge/discharge and a limited lifespan.3 Due to these limitations, supercapacitors have received rapidly increasing attention for their applications in energy storage due to their high power density, rapid charge-discharge capability, and long life cycle.4-7 Currently, more than 80% of commercial supercapacitors utilize carbon as a primary active electrode material. The energy is stored at the electrolyte/carbon interfaces through two primary mechanisms: electrochemical double layer capacitance (EDLC) which involves physical adsorption of ions from the electrolyte, and pseudocapacitance involving reversible faradaic redox reactions. 8,9 The stored energy of a supercapacitor (E) can be calculated based on the following equation:where C is the dc capacitance in F, and V is the nominal voltage. The most important challenge supercapacitors are facing today is increasing the cell energy density beyond 10 Wh kg −1 and reducing costs at the same time.11 This can be potentially achieved by increasing the cell capacitance and/or operating voltage. The capacitance is generally determined by the carbon/electrolyte interface and electrochemical behavior of carbon surfaces. To increase t...

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Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

Cited by 58 publications

References 48 publications

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Performance of activated carbons synthesized from fruit dehydration biowastes for supercapacitor applications

High Temperature Monolithic Biochar Supercapacitor Using Ionic Liquid Electrolyte

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Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

Cited by 58 publications

References 48 publications

Maximized Energy Density of RuO2//RuO2 Supercapacitors through Potential Dependence of Specific Capacitance

Maximized Energy Density of RuO2//RuO2 Supercapacitors through Potential Dependence of Specific Capacitance

Performance of activated carbons synthesized from fruit dehydration biowastes for supercapacitor applications

High Temperature Monolithic Biochar Supercapacitor Using Ionic Liquid Electrolyte

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Product

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Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance

Maximized Energy Density of RuO₂//RuO₂ Supercapacitors through Potential Dependence of Specific Capacitance