Optimisation of an asymmetric manganese oxide/activated carbon capacitor working at 2V in aqueous medium

Khomenko, Volodymyr; Raymundo-Piñero, E.; Béguin, François

doi:10.1016/j.jpowsour.2005.03.210

Cited by 715 publications

(467 citation statements)

References 27 publications

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“…In addition, to investigate the relationship between the ERS and power density of our printed SWNT thin film electrodes, we performed EIS measurements on samples with different thicknesses (40 nm, 80 nm, 0.1 μm, 0.17 μm, and 0.2 μm). The ESR of printed SWNT thin film electrodes can usually be extracted from the high frequency part of EIS curves [34]. For instance, the ESR of a 0.2 μm SWNT film is about 90.7 Ω, as can be observed in Fig.…”

Section: Resultsmentioning

confidence: 99%

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

et al. 2010

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Single-walled carbon nanotube (SWNT) thin film electrodes have been printed on flexible substrates and cloth fabrics by using SWNT inks and an off-the-shelf inkjet printer, with features of controlled pattern geometry (0.4-6 cm 2 ), location, controllable thickness (20-200 nm), and tunable electrical conductivity. The as-printed SWNT films were then sandwiched together with a piece of printable polymer electrolyte to form flexible and wearable supercapacitors, which displayed good capacitive behavior even after 1,000 charge/discharge cycles. Furthermore, a simple and efficient route to produce ruthenium oxide (RuO 2 ) nanowire/SWNT hybrid films has been developed, and it was found that the knee frequency of the hybrid thin film electrodes can reach 1,500 Hz, which is much higher than the knee frequency of the bare SWNT electrodes (~158 Hz). In addition, with the integration of RuO 2 nanowires, the performance of the printed SWNT supercapacitor was significantly improved in terms of its specific capacitance of 138 F/g, power density of 96 kW/kg, and energy density of 18.8 Wh/kg. The results indicate the potential of printable energy storage devices and their significant promise for application in wearable energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

et al. 2010

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“…This configuration have been profited for the development of Li-ion capacitors that combines an activated carbon electrode with graphite (Khomenko et al, 2008) or crystalline intercalation compounds (Amatucci et al, 2001). Wide voltage in water-based electrolytes capacitors can be also achieved using in the same cell an electrode made with transition metal oxides (Cottineau et al, 2006;Khomenko et al, 2006) and conducting polymers (Laforgue et al, 2001;Salinas-Torres et al, 2013) supported over a carbon material and combined with an activated carbon electrode.…”

Section: Introductionmentioning

confidence: 99%

“…In the first case, using activated carbons with optimized surface chemistry for each electrode, the operating voltage of acidbased supercapacitors can be expanded up to 1.6 V (Khomenko et al, 2010), while those prepared in neutral aqueous electrolytes can reach outstanding voltage values as high as 2.0 V (Khomenko et al, 2006;Gao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

et al. 2016

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Supercapacitors are energy storage devices that offer a high power density and a low energy density in comparison with batteries. Their limited energy density can be overcome by using asymmetric configuration in mass electrodes, where each electrode works within their maximum available potential window, rendering the maximum voltage output of the system. Such asymmetric capacitors are optimized using the capacitance and the potential stability limits of the electrodes, with the reliability of the design largely depending on the accuracy and the approach taken for the electrochemical characterization. Therefore, the performance could be lower than expected and even the system could break down, if a well thought out procedure is not followed.In this work, a procedure for the development of asymmetric supercapacitors based on activated carbons is detailed. Three activated carbon materials with different textural properties and surface chemistry have been systematically characterized in neutral aqueous electrolyte. The asymmetric configuration of the masses of both electrodes in the supercapacitor has allowed to cover a higher potential window, resulting in an increase of the energy density of the three devices studied when compared with the symmetric systems, and an improved cycle life.

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“…7,8 However, energy density is highly limited due to the restricted (due to water splitting issue) operating potential (∼1.23 V) of such aqueous electrolyte solutions. 9,10 Hence, the concept of making asymmetric SC has emerged to suppress the negative and positive polarization and thereby widening the operating potential in an aqueous medium up to ∼2 V. 11 However, still the energy density of such asymmetric SC system is far below than the desired level to power HEV and EV, poor cycleability being another important concern. Another approach to enhance the energy density is employing non-aqueous electrolytes without compromising power density according to the equation, E = 1/2 CV 2 .…”

Section: Introductionmentioning

confidence: 99%

Non-aqueous energy storage devices using graphene nanosheets synthesized by green route

et al. 2013

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In this paper we report the use of triethylene glycol reduced graphene oxide (TRGO) as an electrode material for non-aqueous energy storage devices such as supercapacitors and Li-ion batteries. TRGO based non–aqueous symmetric supercapacitor is constructed and shown to deliver maximum energy and power densities of 60.4 Wh kg–1 and 0.15 kW kg–1, respectively. More importantly, symmetric supercapacitor shows an extraordinary cycleability (5000 cycles) with over 80% of capacitance retention. In addition, Li-storage properties of TRGO are also evaluated in half-cell configuration (Li/TRGO) and shown to deliver a reversible capacity of ∼705 mAh g–1 with good cycleability at constant current density of 37 mA g–1. This result clearly suggests that green-synthesized graphene can be effectively used as a prospective electrode material for non-aqueous energy storage systems such as Li-ion batteries and supercapacitors

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Optimisation of an asymmetric manganese oxide/activated carbon capacitor working at 2V in aqueous medium

Cited by 715 publications

References 27 publications

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

Inkjet printing of single-walled carbon nanotube/RuO2 nanowire supercapacitors on cloth fabrics and flexible substrates

Design of Activated Carbon/Activated Carbon Asymmetric Capacitors

Non-aqueous energy storage devices using graphene nanosheets synthesized by green route

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