Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Lee, Byeongyong; Lee, Chong Min; Liu, Tianyuan; Eom, KwangSup; Chen, Zhongming; Noda, Suguru; Fuller, Thomas F.; Jang, Hee Dong; Lee, Seung Woo

doi:10.1039/c6nr02013e

Cited by 31 publications

(27 citation statements)

References 65 publications

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“…Lee et al demonstrated the effective use of CNT on aerosol‐made 3D GR/CNTs for enhanced electrochemical energy storage, showing a 3D hierarchical porous structure that enables fast ion and electron transfers through electrodes . These composite electrodes are employed as positive electrodes in Li‐ion capacitors, delivering high gravimetric capacities of 170 mAh g −1 at a current density of 0.1 A g −1 with significantly enhanced rate performance compared to the electrodes of 2D GR CNTs.…”

Section: Aerosol‐made 3d Graphene‐based Composites For Supercapacitormentioning

confidence: 99%

High Potential of Aerosol‐Made 3D Graphene‐Based Composites for Enhanced Energy Storage

Kim

Lee

et al. 2019

Macromol. Rapid Commun.

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another very important type of advanced energy storage system, and they are highly useful and promising devices for related storage purposes. [6] Batteries that maintain high energy density levels, high operability, and long cycling lifetimes are regarded as the most promising power source for portable devices and electric vehicles. [7] Typical batteries consist of an anode, a cathode, an electrolyte, and a separator. [8] The performance of these electrochemical energy conversion or storage systems is highly dependent on the properties of the active electrode material. Graphene (GR), a flat single layer of sp 2 -bonded single carbon atoms, has recently attracted strong interest as the most promising active electrode material due to its high specific surface area, high thermal conductivity, excellent mechanical rigidity, fast electronic transport, high optical transparency, and other useful properties. [9,10] However, conventionally prepared GRs by the liquid-phase reaction are formed mostly as 2D layered GR sheets and tend randomly or easily to aggregate, repackage, and restack by means of π-π stacking and van der Waals attraction. [11,12] The random stacking of GR sheets reduces the specific surface area and thus decreases the electrochemical performance. [11,12] To overcome these drawbacks of random stacking of GR, many researchers have studied 3D GR for energy storage systems by various liquid-phase, freeze-drying methods, and so on. In previous studies, Qu et al. introduced GR-polyaniline (PANI) composites by hydrothermal for high-rate performance in supercapacitors. [13] Xu et al. produced 3D porous GR and metal-organic framework composites by freeze-drying, which showed a good rate capability with high specific capacitances. [14] Zhang et al. also showed metal-organic framework/GR composite fibers by wet-spinning and as-prepared composites indicated high electrochemical performance. [15] However, the above methods are time-consuming and disadvantageous in that the control of shape is difficult. The fabrication of 3D GR by an aerosol process is considered as a highly promising type of platform technology with many advantages to solve problems of previous methods. The aerosol process is advantageous to fabricate various composites in less than a few minutes with certain compositions of colloidal precursor solutions that contain GO and any type of dissolved metal-based compound. [16][17][18] Figure 1 shows a schematic illustration of various 3D GR-based composites formed from a graphene oxide (GO) and component colloidal mixture by an aerosol process. Various aerosol-made 3D Graphene CompositesRecently, many researchers have developed advanced energy storage and energy conversion systems to address the increased demand for energy resources. The performance of these electrochemical energy storage and conversion devices depends considerably on the properties of their unique electrode materials. Among electrode materials, graphene (GR) has attracted much attention due to its unique properties of high flexibility,...

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Section: Aerosol‐made 3d Graphene‐based Composites For Supercapacitormentioning

confidence: 99%

High Potential of Aerosol‐Made 3D Graphene‐Based Composites for Enhanced Energy Storage

Kim

Lee

et al. 2019

Macromol. Rapid Commun.

Self Cite

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“…Other crumpled graphene nanocomposites were also reported. For instance, a redox-active crumpled graphene/few-walled carbon nanotubes electrode was created using the partially reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes mixture through vacuum-filtration process [ 78 ]. It was shown that this hierarchical nanostructure can exhibit improved capacities of up to ~ 170 mAh/g and rate capability compared to geometrically different counterpart with a similar composition.…”

Section: Porous Graphenementioning

confidence: 99%

“…It was shown that this hierarchical nanostructure can exhibit improved capacities of up to ~ 170 mAh/g and rate capability compared to geometrically different counterpart with a similar composition. The high capacity and cycling stability can be attributed to fast ion diffusion and electron transport as well as redox-active oxygen-containing functional groups attached on partially reduced graphene oxide sheets and carbon nanotubes [ 78 ].…”

Section: Porous Graphenementioning

confidence: 99%

“…In other literatures, redox-active graphene electrodes and its composites have also been demonstrated for cathode materials in LIBs [ 78 , 136 – 138 ]. In this strategy, oxygen-containing functional groups on graphene sheets can act as redox centers at ~ 3 V (Vs. Li), which provides pseudocapacitance in addition to electric double layer capacitance [ 78 , 136 – 138 ]. For instance, when GO was reduced by tetrahydroxyl-1,4-benzoquinone (THQ) at 80 °C, a 3D functionalized graphene structure was produced, which has a broad pore size distribution from tens of nanometers to tens of micrometers [ 138 ].…”

Section: Energy Storage Using Porous Graphene and Graphene-based Nanomentioning

confidence: 99%

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Nanostructured porous graphene and its composites for energy storage applications

et al. 2017

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Graphene, 2D atomic-layer of sp2 carbon, has attracted a great deal of interest for use in solar cells, LEDs, electronic skin, touchscreens, energy storage devices, and microelectronics. This is due to excellent properties of graphene, such as a high theoretical surface area, electrical conductivity, and mechanical strength. The fundamental structure of graphene is also manipulatable, allowing for the formation of an even more extraordinary material, porous graphene. Porous graphene structures can be categorized as microporous, mesoporous, or macroporous depending on the pore size, all with their own unique advantages. These characteristics of graphene, which are further explained in this paper, may be the key to greatly improving a wide range of applications in energy storage systems.

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“…The electrochemical lithiation/delithiation of oxygen-containing functional groups (OCFGs), i.e. C-O-C, >C=O and COOH, of carbon nanotube (CNT) [1][2][3][4][5][6], graphene [7][8][9][10][11][12][13][14][15][16][17][18][19], CNT/graphene hybrid [20,21] and CNT/carbon sphere hybrid [22] OCFGs on CNTs in a carbonate-based electrolyte improve the capacity significantly [1]. Jang et al figured out that these redox reactions are present in reduced graphene oxide (rGO) as well [7].…”

Section: Introductionmentioning

confidence: 99%

Tuning inner-layer oxygen functional groups of reduced graphene oxide by potentiostatic oxidation for high performance electrochemical energy storage devices

Wang

Feng

et al. 2017

Electrochimica Acta

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The electrochemical lithiation/delithiation of oxygen-containing functional groups (OCFGs) of nanocarbon materials, particularly graphene, have attracted intensive interest in recent years. Here, we propose a controllable potentiostatic oxidation approach to tune the OCFGs of as-prepared reduced graphene oxide (rGO) in a carbonate-based electrolyte to improve the specific capacity and rate capability. By X-Ray absorption spectroscopy in total fluorescence yield mode and X-Ray diffraction, we confirm that potentiostatic oxidations generate new OCFGs in the inner-layer of rGO. The content of OCFGs increases as oxidation potential being elevated. Such increasing of OCFGs in quantity significantly enhances the capacity. For instance, the specific capacity of 170.4 mAh g-1 for pristine rGO electrode is increased to 290.5 mAh g-1 after the oxidation at 5.0 V. We demonstrate that oxidations at moderate potentials can reduce the electrochemical and ohmic polarizations of rGO electrodes without

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Hierarchical networks of redox-active reduced crumpled graphene oxide and functionalized few-walled carbon nanotubes for rapid electrochemical energy storage

Cited by 31 publications

References 65 publications

High Potential of Aerosol‐Made 3D Graphene‐Based Composites for Enhanced Energy Storage

High Potential of Aerosol‐Made 3D Graphene‐Based Composites for Enhanced Energy Storage

Nanostructured porous graphene and its composites for energy storage applications

Tuning inner-layer oxygen functional groups of reduced graphene oxide by potentiostatic oxidation for high performance electrochemical energy storage devices

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