All-carbon hybrids for high performance supercapacitors

Yüksel, Recep; Kaplan, Begüm Yarar; Biçer, Emre; Yürüm, Alp; Gürsel, Selmiye Alkan; Ünalan, Hüsnü Emrah

doi:10.1002/er.4103

Cited by 44 publications

(37 citation statements)

References 61 publications

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“…There is a great need to develop “green” materials and technologies for the energy storage due to the demand of sustainable energy, the lack of fossil fuels, and the environmental concerns. Supercapacitors (SCs), possessing outstanding performance of high power, fast charge/discharge rates, and long‐term stability, have potential applications in electronics, electric vehicles, etc, which need high‐power pulses …”

Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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Summary In this work, we prepare a series of activated carbons (ACs) from xylose with different combinations of hydrothermal synthesis (HTS) and chemical activation with KOH. The prepared ACs exhibit a variety of morphologies and porous structures, which depend on the conditions used in the hydrothermal synthesis and the chemical activation. The largest surface area (SBET) of the prepared ACs, which is calculated by the Brunauere Emmette Teller (BET) method, is ~3500 m2/g, and the largest volume fraction of mesopores of the prepared ACs is 60%. The correlations between the specific electrochemical properties of the ACs and the structures of the ACs (ie, porous structures and morphologies) are discussed. Spherical ACs exhibit superior rate performance with low impedance. The ACs with three‐dimensional interconnected network of large surface area and porosity possess high specific capacitance. The largest specific capacitance reaches 340 F/g at a current density of 0.5 A/g and 220 F/g at a current density of 50 A/g, which are superior or comparable to those of similar systems. The long‐term capacitance retention is ~86.8% after 10 000 cycles at a current density of 50 A/g. The energy density reaches 48 Wh/kg at a power density of 13.6 kW/kg.

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Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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“…It has a larger discharging curve than charging curve, which is probably because of the surface reaction happening between the surface of cathode and ions of electrolyte and hysteresis in intercalation/ deintercalation of ions at anode in process of charging and discharging. [49][50][51][52][53] The key factor in obtaining ultra-high energy density is the kinetic stability between the electrodes at wide working potentials of this device. The device delivers an E-P density of 91 W h kg −1 and 424.95 W kg −1 , respectively, which is higher than previous reports (40-70 Wh kg −1 at maximum).…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

All graphene electrode for high‐performance asymmetric supercapacitor

et al. 2019

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Electrode imbalance" is one of the major issues that hinders the potential performance of asymmetric supercapacitors (ASCs), which arises mainly due to the huge dissimilarities of the electrodes microstructures. Herein, an "allgraphene" electrode system is designed by simple chemo-thermal modification of graphene oxide. Chemically functionalized graphene (FG) cathode and two anodes based on thermally reduced graphene oxide (TrGO) and iodine-doped graphene (IG) prepared via simple synthetic routes, followed by assembling into ASCs. The ASC comprising FG cathode-IG anode delivers phenomenally high energy-power (E-P) density (91 W h kg −1 and 424.95 W kg −1 ) and a good capacitance retention after 10 000 cycles. This outcome is accredited to the similar chemistry of electrodes resulting in a minimal electrode imbalance.The developed scheme has capacity to be employed as all-graphene hybrid energy storage system outputting enhanced performance and cyclic stability.asymmetric supercapacitor, all-graphene electrode system, functionalized graphene, iodinedoped graphene, ultra-high energy density

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“…Supercapacitors (SCs) were regarded as one of the most promising energy storage devices because of their superior power density, fast charge/discharge process, and ultralong cycle stability . But the practical applications of SCs were dramatically limited by the low energy density . Currently, battery‐supercapacitor hybrid (BSH) device composed of a capacitive electrode and a battery‐type electrode was used to increase energy density .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

et al. 2020

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The synergistic effects of multiple components and unique nanostructures were contributed to prepare the high‐performance battery‐type electrode materials. In this work, Mo element was introduced to form the ternary transition metal oxides/hydroxides of Ni‐Co to improve conductivity, and then charge transfer was accelerated to enhance the capacity storage. After sulfidation, the electrical conductivity was further improved, and a porous flower‐like nanostructure was formed. Except for that, the composites of transition metal oxides/hydroxides and sulfides were formed via sulfidation. With the help of the synergistic effects of multiple components and a porous flower‐like nanostructure, more Faradic redox reactions occurred. Therefore, the as‐prepared porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam exhibited an excellent areal capacitance of 7.22 C·cm−2 at 5 mA·cm−2 and long‐cycle stability (96.9% retention after 5000 cycles). Furthermore, a coin‐type battery‐supercapacitor hybrid (BSH) device was assembled, which achieved 54.54 Wh·kg−1 at 540 W·kg−1 and displayed 74.8% capacitance retention after 3500 cycles. All mentioned above demonstrated that ternary transition metal oxides/hydroxides precursors via sulfidation can form special structures and the composites of transition metal oxides/hydroxides and sulfides to prepare high‐performance battery‐type electrodes for energy storage.

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All-carbon hybrids for high performance supercapacitors

Cited by 44 publications

References 61 publications

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

All graphene electrode for high‐performance asymmetric supercapacitor

Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

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