Edge-enriched porous graphene nanoribbons for high energy density supercapacitors

Zheng, Chao; Zhou, Xuebing; Cao, Hongliang; Wang, G. H.; Liu, Z. P.

doi:10.1039/c4ta00727a

Cited by 58 publications

(28 citation statements)

References 41 publications

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“…By calculating from the GCD curves (Figure c) of as‐fabricated devices at different current densities from 1 to 8 A/g, the ASCs deliver a capacitance of 58.1 F/g at the current density of 1 A/g, which contributes to achieving a maximum energy density up to 98.75 W h/kg at a power density of 1 750 W/kg (Figure e). As shown in Figure e, these CDs/G//P−Fe 2 O 3 /G ASCs with such superior energy storage performance outperform commercial lithium ion batteries and SCs, aqueous SCs, as well as most previously reported IL‐based SCs (Table S1), and other metal oxides, graphene based supercapacitors …”

Section: Resultssupporting

confidence: 60%

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

et al. 2018

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Energy‐dense supercapacitors (SCs) based on metal oxides@graphene electrode and ionic liquid (IL) electrolyte hold great promise in sustainable energy system. However, these types of SCs suffer from poor cycling stability, especially at high working voltage. Herein, a porous ferric oxide/graphene (P−Fe2O3/G) electrode has been developed, in which Fe2O3 nanoparticles exhibit abundant and suitable mesoporous channels. This structure ensures the high ionic diffusion kinetics of the IL ions during the repeated charging‐discharging processes, thereby providing the P−Fe2O3/G electrode with outastanding capacitance behavior and cycling performance in IL electrolyte. As a result, an ingenious asymmetric electrode concept has been put forward to fabricate energy‐dense SCs based on this P−Fe2O3/G as negative electrode, carbon dodecahedrons/graphene (CDs/G) as positive electrode and IL electrolyte. Remarkably, the fabricated devices exhibit superior high‐voltage cycling stability with 95 % retention after 20 000 cycles, which are much better than that of most previously reported SCs based on metal oxides/graphene electrode and IL electrolyte. On this basis, a sustainable energy system combining wind harvesting with asymmetric SCs has been established, wherein the asymmetric SCs can be effectively recharged by harvesting sustainable wind power and repeatedly supply power without decline of electrochemical performance. Therefore, this work can provide a promising porous electrode for high performance SCs in sustainable energy system.

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Section: Resultssupporting

confidence: 60%

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

et al. 2018

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“…Figure e shows the Ragone plot of the GNC‐8 in coin‐typed symmetric electrode supercapacitor. The GNC‐8 possesses comparable and even higher energy density and power density, compared with the previous reported of porous graphene or graphene‐based composite in aqueous based flexible supercapacitor . The highest energy density of 75 Wh Kg −1 is delivered at corresponding power density of 451 W Kg −1 .…”

Section: Resultsmentioning

confidence: 78%

Flexible Solid‐State Supercapacitors with Enhanced Performance from Hierarchically Graphene Nanocomposite Electrodes and Ionic Liquid Incorporated Gel Polymer Electrolyte

Feng

Wang

Zhang

et al. 2017

Adv Funct Materials

262

114

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High energy density, durability, and flexibility of supercapacitors are required urgently for the next generation of wearable and portable electronic devices. Herein, a novel strategy is introduced to boost the energy density of flexible soild-state supercapacitors via rational design of hierarchically graphene nanocomposite (GNC) electrode material and employing an ionic liquid gel polymer electrolyte. The hierarchical graphene nanocomposite consisting of graphene and polyaniline-derived carbon is synthesized as an electrode material via a scalable process. The meso/microporous graphene nanocomposites exhibit a high specific capacitance of 176 F g −1 at 0.5 A g −1 in the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF 4 ) with a wide voltage window of 3.5 V, good rate capability of 80.7% in the range of 0.5-10 A g −1 and excellent stability over 10 000 cycles, which is attributed to the superior conductivity (7246 S m −1 ), and quite large specific surface area (2416 m 2 g −1 ) as well as hierarchical meso/micropores distribution of the electrode materials. Furthermore, flexible solid-state supercapacitor devices based on the GNC electrodes and gel polymer electrolyte film are assembled, which offer high specific capacitance of 180 F g −1 at 1 A g −1 , large energy density of 75 Wh Kg −1 , and remarkable flexible performance under consecutive bending conditions.

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“…11F), is fairly high in comparison to that of GRH (220 F/g at 1 A/g), as well as graphene sheets synthesized by employing various other reducing agents such as: Sn powder (152 F/g at 1.5 A/g), trigol (130 F/g at 1 A/g), tartaric/ malic / oxalic acid (100.8/112.4/147 F/g at 0.1 A/g), caffeic acid (136 F/g at 1 A/g) and from bio-reduction (137 F/g at 1.3 A/g); and even higher to those of some N doped graphene sheets employing reducing agents such as: hydrazine (133 F/g at 1 A/g) and ammonia (233.3 F/g at 0.5 A/g). 47 Whereas, for GNRs synthesized by unzipping of pristine MWCNTs / CNTs varied values of C s were obtained based on the method were as follows: employing H 3 PO 4 as reducing agent (150 F/g at 1A/g) 48 ; using hydroiodic acid as reductant (147 F/g at 0.5 A/g) 49 ; heat treatment in Ar at 600 0 C of: oxidized CNTs (130 F/g at 1 mV/s) 50 and graphene oxide nanoribbons obtained from MWCNTs (115.6 F/g at 1.7 A/g). 47 Whereas, for GNRs synthesized by unzipping of pristine MWCNTs / CNTs varied values of C s were obtained based on the method were as follows: employing H 3 PO 4 as reducing agent (150 F/g at 1A/g) 48 ; using hydroiodic acid as reductant (147 F/g at 0.5 A/g) 49 ; heat treatment in Ar at 600 0 C of: oxidized CNTs (130 F/g at 1 mV/s) 50 and graphene oxide nanoribbons obtained from MWCNTs (115.6 F/g at 1.7 A/g).…”

Section: Discussionmentioning

confidence: 99%

One-step chemically controlled wet synthesis of graphene nanoribbons from graphene oxide for high performance supercapacitor applications

Khandelwal

Kumar

2015

J. Mater. Chem. A

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The present manuscript for the first time reports a novel one-step wet chemical approach to synthesize about 150-300 nm wide graphene nanoribbons (GNRs) by reduction of graphene oxide (GO) using malonic acid as a reducing agent. The optical, X-ray diffraction, high resolution transmission electron microscopy, Raman, Infrared, X-ray photoelectron spectroscopy and 13 C nuclear magnetic resonance (NMR) demonstrated the effective reduction of GO. The average thickness of GNRs has been estimated by atomic force microscopy at 3.3 ± 0.2 nm, which is reduced significantly to 1.1 ± 0.5 nm upon annealing at 300 0 C (GNRs-300). In the process of nucleation and growth, the intermediate(s), formed between the malonic acid and GO undergo twisting/folding involving supramolecular interactions to yield ̴ 0.15 to 1 mm long curled GNRs. 13 C NMR demonstrates a significant increase in sp 2 character of nanoribbons following the order: GO < GNRs < GNRs-300 as was also evidenced by the conductivity measurements. GNRs exhibited high specific capacitance value of 301 F/g at 1 A/g with good cyclic stability for 4000 charge-discharge cycles at 15 A/g, and high energy density/power density (16.84 Wh/kg / 5944 W/kg) in aqueous electrolyte demonstrating their tremendous potential as electrode material for energy storage applications. T im e (h ) Wav elen gth (nm ) Absorbance (a.u) 253 nm 231 nm 303 nm 256 nm 262 nm C

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Edge-enriched porous graphene nanoribbons for high energy density supercapacitors

Cited by 58 publications

References 41 publications

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

Flexible Solid‐State Supercapacitors with Enhanced Performance from Hierarchically Graphene Nanocomposite Electrodes and Ionic Liquid Incorporated Gel Polymer Electrolyte

One-step chemically controlled wet synthesis of graphene nanoribbons from graphene oxide for high performance supercapacitor applications

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Edge-enriched porous graphene nanoribbons for high energy density supercapacitors

Cited by 58 publications

References 41 publications

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe2O3@Graphene Electrode in Ionic Liquid Electrolyte

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe2O3@Graphene Electrode in Ionic Liquid Electrolyte

Flexible Solid‐State Supercapacitors with Enhanced Performance from Hierarchically Graphene Nanocomposite Electrodes and Ionic Liquid Incorporated Gel Polymer Electrolyte

One-step chemically controlled wet synthesis of graphene nanoribbons from graphene oxide for high performance supercapacitor applications

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Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte