N-doped reduced graphene oxide aerogel coated on carboxyl-modified carbon fiber paper for high-performance ionic-liquid supercapacitors

Iamprasertkun, Pawin; Krittayavathananon, Atiweena; Sawangphruk, Montree

doi:10.1016/j.carbon.2015.12.092

Cited by 157 publications

(85 citation statements)

References 38 publications

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“…The amounts of C, N, and O in the materials are 75.8, 16.3, and 7.9 at%, respectively. The high‐resolution C1s XPS spectrum corresponds to the following five carbon bonds: 284.6 eV (CC), 286.1 eV (CO), 287.0 eV (CN), 288.3 eV (CO), and 289.6 eV (OCO) . The CN peaks demonstrated the successful nitrogen doping in the material.…”

Section: Resultsmentioning

confidence: 98%

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Liu

Wang

et al. 2018

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Flexible supercapacitors have shown enormous potential for portable electronic devices. Herein, hierarchical 3D all-carbon electrode materials are prepared by assembling N-doped graphene quantum dots (N-GQDs) on carbonized MOF materials (cZIF-8) interweaved with carbon nanotubes (CNTs) for flexible all-solid-state supercapacitors. In this ternary electrode, cZIF-8 provides a large accessible surface area, CNTs act as the electrical conductive network, and N-GQDs serve as highly pseudocapactive materials. Due to the synergistic effect and hierarchical assembly of these components, N-GQD@cZIF-8/CNT electrodes exhibit a high specific capacitance of 540 F g at 0.5 A g in a 1 m H SO electrolyte and excellent cycle stability with 90.9% capacity retention over 8000 cycles. The assembled supercapacitor possesses an energy density of 18.75 Wh kg with a power density of 108.7 W kg . Meanwhile, three supercapacitors connected in series can power light-emitting diodes for 20 min. All-solid-state N-GQD@cZIF-8/CNT flexible supercapacitor exhibits an energy density of 14 Wh kg with a power density of 89.3 W kg , while the capacitance retention after 5000 cycles reaches 82%. This work provides an effective way to construct novel electrode materials with high energy storage density as well as good cycling performance and power density for high-performance energy storage devices via the rational design.

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Section: Resultsmentioning

confidence: 98%

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Liu

Wang

et al. 2018

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“…The energy and power characteristics of GCNS-based electrodes are also compared with those of the state-of-the-art biomass-derived carbon nanosheet electrodes from hemp [4], silk [8], coffee grounds [9], shrimp shells [11] and reed [44], biomass-derived porous carbon electrodes from soybean root [46], algae [42] and cellulose nanofibril [47], graphene-based electrodes such as N-doped reduced graphene oxide aerogel [48] and S, P-codoped porous graphene aerogels [49], and other advanced carbon electrodes such as carbon nanosponge [50] and carbon nanofiber [51] in ionic liquid electrolytes.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Tian

Gao

Tan

et al. 2017

Carbon

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A type of unusual interconnected graphitized carbon nanosheets (GCNS) was fabricated from biomass waste, i.e., inner shaddock skins using a facile combined method of simultaneous carbonization-activation and post-vacuum-annealing processes. The obtained GCNS has an optimized integration of a cage-like high-aspect-ratio nanosheet structure (~8 nm thickness), a large surface area of 2327 m 2 g -1 and hierarchical meso/micropore systems (82.3% mesopore volume).Given the effect of post-vacuum-annealing process, enhanced graphitization degree and excellent electronic conductivity (7.9 S cm -1 ) were obtained for the GCNS. The enhanced graphitization degree not only effectively improves electronic/ionic-transport kinetics in favor of rate capability but also prevents electrolyte degradation thus benefitting cyclic life. The ionic liquid-based supercapacitors assembled with symmetric GCNS electrodes exhibited an ultrahigh rate capability of 87% at current density of 100 A g -1 (holding 132 F g −1 ) and a long cyclic life of 97.6% capacitance retention after 10,000 cycles. The excellent rate capability resulted in an integrated high energy-power property at an energy density of 56 Wh kg -1 (29.2 Wh L -1 ), corresponding to a power density of 93 kW kg -1 (48.4 kW L -1 ).

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“…GO was firstly synthesized using a modified Hummers method previously reported by our group142659606162. The N-rGO ae was then synthesized via a hydrothermal reduction of GO with 0.5 M hydrazine (N 2 H 4 ) a reducing agent.…”

Section: Methodsmentioning

confidence: 99%

“…The diluted N- and O-containing groups of the N-rGO ae can lead to high ionic adsorption26. They can also store the electronic charges via surface redox reactions2728.…”

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confidence: 99%

Charge storage mechanisms of manganese oxide nanosheets and N-doped reduced graphene oxide aerogel for high-performance asymmetric supercapacitors

Iamprasertkun

Krittayavathananon

Seubsai

et al. 2016

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100

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Although manganese oxide- and graphene-based supercapacitors have been widely studied, their charge storage mechanisms are not yet fully investigated. In this work, we have studied the charge storage mechanisms of K-birnassite MnO2 nanosheets and N-doped reduced graphene oxide aerogel (N-rGOae) using an in situ X-ray absorption spectroscopy (XAS) and an electrochemical quart crystal microbalance (EQCM). The oxidation number of Mn at the MnO2 electrode is +3.01 at 0 V vs. SCE for the charging process and gets oxidized to +3.12 at +0.8 V vs. SCE and then reduced back to +3.01 at 0 V vs. SCE for the discharging process. The mass change of solvated ions, inserted to the layers of MnO2 during the charging process is 7.4 μg cm−2. Whilst, the mass change of the solvated ions at the N-rGOae electrode is 8.4 μg cm−2. An asymmetric supercapacitor of MnO2//N-rGOae (CR2016) provides a maximum specific capacitance of ca. 467 F g−1 at 1 A g−1, a maximum specific power of 39 kW kg−1 and a specific energy of 40 Wh kg−1 with a wide working potential of 1.6 V and 93.2% capacity retention after 7,500 cycles. The MnO2//N-rGOae supercapacitor may be practically used in high power and energy applications.

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N-doped reduced graphene oxide aerogel coated on carboxyl-modified carbon fiber paper for high-performance ionic-liquid supercapacitors

Cited by 157 publications

References 38 publications

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Charge storage mechanisms of manganese oxide nanosheets and N-doped reduced graphene oxide aerogel for high-performance asymmetric supercapacitors

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