Structure‐Controlled, Vertical Graphene‐Based, Binder‐Free Electrodes from Plasma‐Reformed Butter Enhance Supercapacitor Performance

Seo, Dong Han; Han, Zhao Jun; Kumar, Shailesh; Ostrikov, Kostya Ken

doi:10.1002/aenm.201300431

Cited by 186 publications

(153 citation statements)

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“…Pristine VGNS was observed to uniformly cover the skeleton of Ni foam that had submillimeter scale voids (Figure 1a), whereas cavities at the submicron scale were formed between neighboring graphene nanosheets arising from the vertical orientation of interconnected VGNS (Figure 1b). 18 Moreover, the maze-like networks of graphene nanosheets were easily distinguishable in the high-magnification SEM image (inset of Figure 1b). The height of the graphene nanosheets was~2 μm, as illustrated by the cross-sectional SEM image in Figure 1c.…”

Section: Morphology and Structure Of The Mos 2 /Vgns Nanostructuresmentioning

confidence: 92%

“…18,19 VGNS consists of few-layered graphene sheets self-organized in a vertical orientation with an inherently open and interconnected array structure. The structural rigidity of VGNS can prevent the restacking of graphene nanosheets, a commonly observed problem in horizontal graphene.…”

Section: Introductionmentioning

confidence: 99%

“…First, VGNS was obtained in a plasma-assisted CVD transformation process by using butter as the solid state precursor, where the strong plasma-surface interactions can effectively break down carbon-containing molecules in butter and reconstruct them into vertically aligned graphene nanosheets. 18 The use of butter as the carbon precursor instead of hydrocarbon gases such as CH 4 also enabled complete coverage of VGNS on various substrates at a high mass loading. 24 After immersing VGNS into the solution of Mo salt precursor of (NH 4 ) 2 MoS 4 dissolved in DMF, Mo and S ions started to nucleate on the surface of graphene nanosheets in a solvothermal process.…”

Section: Morphology and Structure Of The Mos 2 /Vgns Nanostructuresmentioning

confidence: 99%

“…Specifically, VGNS was first grown in a plasma-assisted chemical vapor deposition (CVD) process by using butter as the solid precursor. 18 MoS 2 /VGNS nanocomposites were then synthesized via a simple solvothermal method. 1 Various amounts of (NH 4 ) 2 MoS 4 powder (3, 11 and 22 mg for LIB experiments and 11, 22, 55 and 110 mg for HER experiments) were dispersed into 30 ml N,N-dimethylformamide (DMF) by ultrasonication and continuously stirred for approximately 15 min at room temperature.…”

Section: Experimental Procedures Preparation Of Mos 2 /Vgns Structurementioning

confidence: 99%

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MoS2-coated vertical graphene nanosheet for high-performance rechargeable lithium-ion batteries and hydrogen production

et al. 2016

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Hybrid nanostructures composed of vertical graphene nanosheet (VGNS) and MoS 2 nano-leaves are synthesized by the chemical vapor deposition method followed by a solvothermal process. The unique three-dimensional nanostructures of MoS 2 /VGNS arranged in a vertically aligned manner can be easily constructed on various substrates, including Ni foam and graphite paper. Compared with MoS 2 /carbon black, MoS 2 /VGNS nanocomposites grown on Ni foam exhibit enhanced electrochemical performance as the anode material of lithium-ion batteries, delivering a specific capacity of 1277 mAh g − 1 at a current density of 100 mA g − 1 and a high first-cycle coulombic efficiency of 76.6%. Moreover, the MoS 2 /VGNS nanostructures also retain a capacity of 1109 mAh g − 1 after 100 cycles at a current density of 200 mA g − 1 , suggesting excellent cycling stability. In addition, when the MoS 2 /VGNS nanocomposites grown on graphite paper are applied in the hydrogen evolution reaction, a small Tafel slope of 41.3 mV dec − 1 and a large double-layer capacitance of 7.96 mF cm − 2 are obtained, which are among the best values achievable by MoS 2 -based hybrid structures. These results demonstrate the potential applications of MoS 2 /VGNS hybrid materials for energy conversion and storage and may open up a new avenue for the development of vertically aligned, multifunctional nanoarchitectures.

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Section: Morphology and Structure Of The Mos 2 /Vgns Nanostructuresmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Morphology and Structure Of The Mos 2 /Vgns Nanostructuresmentioning

confidence: 99%

Section: Experimental Procedures Preparation Of Mos 2 /Vgns Structurementioning

confidence: 99%

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MoS2-coated vertical graphene nanosheet for high-performance rechargeable lithium-ion batteries and hydrogen production

et al. 2016

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“…[7][8][9] Pseudocapacitive materials store electrochemical energy in a similar manner as carbon-based materials but have a specific capacitance that is usually one order of magnitude larger. Among various pseudocapacitive materials, manganese oxides (MnO x ) have attracted the strongest interest because of their natural abundance, low cost and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

MnOx/carbon nanotube/reduced graphene oxide nanohybrids as high-performance supercapacitor electrodes

et al. 2014

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Nanohybrids consisting of both carbon and pseudocapacitive metal oxides are promising as high-performance electrodes to meet the key energy and power requirements of supercapacitors. However, the development of high-performance nanohybrids with controllable size, density, composition and morphology remains a formidable challenge. Here, we present a simple and robust approach to integrating manganese oxide (MnO x ) nanoparticles onto flexible graphite paper using an ultrathin carbon nanotube/ reduced graphene oxide (CNT/RGO) supporting layer. Supercapacitor electrodes employing the MnO x /CNT/RGO nanohybrids without any conductive additives or binders yield a specific capacitance of 1070 F g − 1 at 10 mV s − 1 , which is among the highest values reported for a range of hybrid structures and is close to the theoretical capacity of MnO x . Moreover, atmosphericpressure plasmas are used to functionalize the CNT/RGO supporting layer to improve the adhesion of MnO x nanoparticles, which results in theimproved cycling stability of the nanohybrid electrodes. These results provide information for the utilization of nanohybrids and plasma-related effects to synergistically enhance the performance of supercapacitors and may create new opportunities in areas such as catalysts, photosynthesis and electrochemical sensors. NPG Asia Materials (2014) 6, e140; doi:10.1038/am.2014.100; published online 31 October 2014 INTRODUCTIONSupercapacitors are promising energy storage systems for diverse applications such as portable electronics, roll-up displays, hybrid electric vehicles, self-powered sensors, artificial muscles and biomedical implants. 1,2 The performance of supercapacitors fills the gap between batteries and conventional electrolytic capacitors, with such advantages as fast dynamic response, high power density, high rate capability, safe operation and long lifespan. The most common materials for current supercapacitor electrodes are high-surface-area carbon-based nanostructures, including activated carbons, porous/ templated graphite, carbon nanotubes (CNTs) and graphene. [3][4][5][6] However, the relatively low specific capacitance and energy density of these carbon-based electrodes have so far hampered their widespread applications in real devices.To address this challenge, hybrid materials that can synergistically combine the attributes of both carbon and pseudocapacitive materials such as metal oxides and conductive polymers have been actively pursued. [7][8][9] Pseudocapacitive materials store electrochemical energy in a similar manner as carbon-based materials but have a specific capacitance that is usually one order of magnitude larger. Among various pseudocapacitive materials, manganese oxides (MnO x ) have attracted the strongest interest because of their natural abundance, low cost and environmental friendliness. 10 Numerous studies have

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Green Nanocomposites

Bunekar

Tsai

2020

Emerging Carbon‐Based Nanocomposites for Environmental Applications

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Structure‐Controlled, Vertical Graphene‐Based, Binder‐Free Electrodes from Plasma‐Reformed Butter Enhance Supercapacitor Performance

Cited by 186 publications

References 47 publications

MoS2-coated vertical graphene nanosheet for high-performance rechargeable lithium-ion batteries and hydrogen production

MoS2-coated vertical graphene nanosheet for high-performance rechargeable lithium-ion batteries and hydrogen production

MnOx/carbon nanotube/reduced graphene oxide nanohybrids as high-performance supercapacitor electrodes

Green Nanocomposites

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