Synthesis of Graphene Films by Rapid Heating and Quenching at Ambient Pressures and Their Electrochemical Characterization

David, Lamuel; Bhandavat, Romil; Kulkarni, Girish S.; Pahwa, Sakshi; Zhong, Zhiyong; Singh, Gurpreet

doi:10.1021/am301782h

Cited by 23 publications

(13 citation statements)

References 39 publications

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“…The SiCN-MoS 2 freestanding paper electrode experienced reduction and oxidation peaks similar to SiCN-MoS 2 traditional electrodes. Lithiation (0.05 and 0.75 V) and delithiation (0.15 V) peaks of rGO (graphene) 61 were not distinguishable from primary peaks of SiCN-MoS 2 because contribution of rGO (10% or less mass loading) to overall specific capacity was negligible.…”

Section: Resultsmentioning

confidence: 97%

Polymer-Derived Ceramic Functionalized MoS2 Composite Paper as a Stable Lithium-Ion Battery Electrode

David

Bhandavat

Barrera

et al. 2015

Sci Rep

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A facile process is demonstrated for the synthesis of layered SiCN-MoS2 structure via pyrolysis of polysilazane functionalized MoS2 flakes. The layered morphology and polymer to ceramic transformation on MoS2 surfaces was confirmed by use of electron microscopy and spectroscopic techniques. Tested as thick film electrode in a Li-ion battery half-cell, SiCN-MoS2 showed the classical three-stage reaction with improved cycling stability and capacity retention than neat MoS2. Contribution of conversion reaction of Li/MoS2 system on overall capacity was marginally affected by the presence of SiCN while Li-irreversibility arising from electrolyte decomposition was greatly suppressed. This is understood as one of the reasons for decreased first cycle loss and increased capacity retention. SiCN-MoS2 in the form of self-supporting paper electrode (at 6 mg·cm−2) exhibited even better performance, regaining initial charge capacity of approximately 530 mAh·g−1 when the current density returned to 100 mA·g−1 after continuous cycling at 2400 mA·g−1 (192 mAh·g−1). MoS2 cycled electrode showed mud-cracks and film delamination whereas SiCN-MoS2 electrodes were intact and covered with a uniform solid electrolyte interphase coating. Taken together, our results suggest that molecular level interfacing with precursor–derived SiCN is an effective strategy for suppressing the metal-sulfide/electrolyte degradation reaction at low discharge potentials.

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Section: Resultsmentioning

confidence: 97%

Polymer-Derived Ceramic Functionalized MoS2 Composite Paper as a Stable Lithium-Ion Battery Electrode

David

Bhandavat

Barrera

et al. 2015

Sci Rep

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“…Raman spectra of carbon-based materials have two distinct peaks. The “G” peak or graphite peak (~1600 cm −1 ) is representative of the in-plane vibrational modes of carbon in graphite lattice (sp 2 hybridized carbon) while “D” peak or defect peak (~1350 cm −1 ) is generated by the presence of defects in the graphite lattice (-sp 3 hybridized carbon) 51 43 44 45 46 47 48 49 50 . Fig.…”

Section: Resultsmentioning

confidence: 99%

Evaluating the thermal damage resistance of graphene/carbon nanotube hybrid composite coatings

David

Feldman

Mansfield

et al. 2014

Sci Rep

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We study laser irradiation behavior of multiwalled carbon nanotubes (MWCNT) and chemically modified graphene (rGO)-composite spray coatings for use as a thermal absorber material for high-power laser calorimeters. Spray coatings on aluminum test coupon were exposed to increasing laser irradiance for extended exposure times to quantify their damage threshold and optical absorbance. The coatings, prepared at varying mass % of MWCNTs in rGO, demonstrated significantly higher damage threshold values at 2.5 kW laser power at 10.6 μm wavelength than carbon paint or MWCNTs alone. Electron microscopy and Raman spectroscopy of irradiated specimens show that the coating prepared at 50% CNT loading endure at least 2 kW.cm−2 for 10 seconds without significant damage. The improved damage resistance is attributed to the unique structure of the composite in which the MWCNTs act as an efficient absorber of laser light while the much larger rGO sheets surrounding them, dissipate the heat over a wider area.

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“…Solution-based chemical reduction of GO have been reported as most popular procedure for the preparation of reduced GO. Previously, it has been proved that reduced GO as a conducting support can absorb catalyst nanostructures and exhibit promoted catalytic performance in different catalytic reactions [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation of dyes over graphene/Pd/TiO2 nanocomposites: TiO2 nanowires versus TiO2 nanoparticles

Safajou

Khojasteh

Salavati‐Niasari

et al. 2017

Journal of Colloid and Interface Science

260

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In this study, at first, TiO nanowire was prepared by an alkaline hydrothermal process. In the following, Gr/Pd/TiO-NPs and Gr/Pd/TiO-NWs were synthesized by a combination of hydrothermal and photodeposition methods. The properties of as prepared products were characterized using XRD, FT-IR, SEM, DRS, TEM, ICP-OES, EDS and TGA analysis. SEM results confirmed nanodimension structure for all samples. Also the band gap values obtained using DRS technique suggests that all the samples have semiconductor behavior. Using TGA analysis, the amount of graphene loaded onto the powders was confirmed. Photocatalytic degradation of rhodamine B by TiO-NWs, Gr/Pd/TiO-NPs and Gr/Pd/TiO-NWs nanocomposites was compared under ultraviolet light irradiation. Results confirmed that the Gr/Pd/TiO-NWs composite show the highest photocatalytic activity due to much higher available surface area of TiO substrate in nanowire structure. It is expected that the synthesis of the high surface area TiO nanowires, facile photodeposition of palladium into its texture, and simple conversion of GO to graphene during hydrothermal process without using strong reducing agents, could be a suitable rote for preparing different types of carbon based TiO nanocomposite photocatalysts.

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Synthesis of Graphene Films by Rapid Heating and Quenching at Ambient Pressures and Their Electrochemical Characterization

Cited by 23 publications

References 39 publications

Polymer-Derived Ceramic Functionalized MoS2 Composite Paper as a Stable Lithium-Ion Battery Electrode

Polymer-Derived Ceramic Functionalized MoS2 Composite Paper as a Stable Lithium-Ion Battery Electrode

Evaluating the thermal damage resistance of graphene/carbon nanotube hybrid composite coatings

Enhanced photocatalytic degradation of dyes over graphene/Pd/TiO2 nanocomposites: TiO2 nanowires versus TiO2 nanoparticles

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