Reduced Graphene Oxide for Li-Air Batteries: The Effect of Oxidation Time and Reduction Conditions for Graphene Oxide

Storm, Mie Møller; Overgaard, Marc; Younesi, Reza; Reeler, Nini Elisabeth Abildgaard; Vosch, Tom; Norby, Poul

doi:10.1149/ma2013-02/6/472

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…Similar results were obtained for samples oxidized for various times between 30 min and 3 days. 32 XPS measurements indicated that an oxygen saturation of the graphite framework was reached within 2 h. The interlayer separation increased from 0.35 to 0.79 nm after 30 min of oxidation, and, in addition, the graphitic peak at 2Θ = 26.6°disappeared completely from the XRD diffractogram. In the following 3 days of oxidation, the interlayer distance enlarged only slightly up to 0.84 nm.…”

Section: ■ Introductionmentioning

confidence: 95%

Chemical Oxidation of Graphite: Evolution of the Structure and Properties

et al. 2017

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Graphene oxide is a complex material whose synthesis is still incompletely understood. To study the time evolution of structural and chemical properties of oxidized graphite, samples at different temporal stages of oxidation were selected and characterized through a number of techniques: X-ray photoelectron spectroscopy for the content and bonding of oxygen, X-ray diffraction for the level of intercalation, Raman spectroscopy for detection of structural changes, electrical resistivity measurements for probing charge localization on the macroscopic scale, and scanning 2 transmission electron microscopy for the atomic structure of the graphene oxide flakes. We found a non-linear behavior of oxygen uptake with time where two concentration plateaus were identified: uptake reached 20 at.% in the first 15 minutes, and after one hour a second uptake started, reaching a highest oxygen concentration of more than 30 at.% after two hours of oxidation. At the same time, the interlayer distance expanded to more than twice the value of graphite and the electrical resistivity increased by 7 orders of magnitude. After four days of chemical processing, the expanded structure of graphite oxide became unstable and spontaneously exfoliated; more than two weeks resulted in a significant decrease of the oxygen content accompanied by re-aggregation of the GO sheets. These correlated measurements allow us to offer a comprehensive view into the complex oxidation process.

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Section: ■ Introductionmentioning

confidence: 95%

Chemical Oxidation of Graphite: Evolution of the Structure and Properties

et al. 2017

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“…Graphene is not only a good conductive material but also a well-known supporting matrix of metal-based catalyst, so it has been widely used in Li-O 2 batteries. 27,28 Nitrogen-doping is a very useful way to modify graphene-based catalysts. Graphene basal planes with added N-doped sites can enhance the ORR activity and further strengthen the electronic conductivity.…”

Section: ■ Introductionmentioning

confidence: 99%

Spinel LiMn₂O₄ Nanoparticles Grown in Situ on Nitrogen-Doped Reduced Graphene Oxide as an Efficient Cathode for a Li-O₂/Li-Ion Twin Battery

Leng

Zeng

et al. 2018

ACS Sustainable Chem. Eng.

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Seeking to design high-efficiency catalyst (LMO@N-rGO) for Li-O 2 batteries, we suggested a onestep hydrothermal strategy to grow well-crystallized spinel LiMn 2 O 4 (LMO) nanoparticles homogeneously on nitrogendoped reduced graphene oxide nanosheets (N-rGO). We found that the prepared material can yield a twin-function battery, functioning as a Li-O 2 (air) battery under the oxygen atmosphere and a Li-ion battery in the absence of oxygen. In the Li-O 2 configuration, the material displayed a lower charge plateau voltage for 0.21 V and excellent cycling performance (120 cycles at 1000 mA h g −1 limited capacity). Furthermore, in the absence of oxygen, the material exhibited very good Li-ion battery cathode performance, achieving a capacity of up 80 mA h g −1 . On the basis of our characterization results, three reasons are suggested for the twin performance of the material: the highly uniform dispersion of LMO nanoparticles, the improved Li diffusion kinetics, and the synergic effect between the spinel LMO nanoparticles and the N-rGO.

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“…Unlike the conventional methods, TRGO was used as precursor instead of GO or graphite due to its being dominant commercially available and well-proven potentials for wide applications. 25,26 After 4−15 h of mixing with H 2 O 2 at room temperature, the originally hydrophobic TRGO was afforded with excellent dispersibility and stability in water. Aqueous paste and uniform dispersions in low-boiling solvents were also easily fabricated from the lyophilized W-Gr powder, owing to the redispersibility.…”

Section: ■ Introductionmentioning

confidence: 99%

Green and Mild Oxidation: An Efficient Strategy toward Water-Dispersible Graphene

You

Yang

et al. 2017

ACS Appl. Mater. Interfaces

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Scalable fabrication of water-dispersible graphene (W-Gr) is highly desirable yet technically challenging for most practical applications of graphene. Herein, a green and mild oxidation strategy to prepare bulk W-Gr (dispersion, slurry, and powder) with high yield was proposed by fully exploiting structure defects of thermally reduced graphene oxide (TRGO) and oxidizing radicals generated from hydrogen peroxide (HO). Owing to the increased carboxyl group from the mild oxidation process, the obtained W-Gr can be redispersed in low-boiling solvents with a reasonable concentration. Benefiting from the modified surface chemistry, macroscopic samples processed from the W-Gr show good hydrophilicity (water contact angle of 55.7°) and excellent biocompatibility, which is expected to be an alternative biomaterial for bone, vessel, and skin regeneration. In addition, the green and mild oxidation strategy is also proven to be effective for dispersing other carbon nanomaterials in a water system.

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Reduced Graphene Oxide for Li-Air Batteries: The Effect of Oxidation Time and Reduction Conditions for Graphene Oxide

Abstract: not Available.

Cited by 6 publications

References 34 publications

Chemical Oxidation of Graphite: Evolution of the Structure and Properties

Chemical Oxidation of Graphite: Evolution of the Structure and Properties

Spinel LiMn₂O₄ Nanoparticles Grown in Situ on Nitrogen-Doped Reduced Graphene Oxide as an Efficient Cathode for a Li-O₂/Li-Ion Twin Battery

Green and Mild Oxidation: An Efficient Strategy toward Water-Dispersible Graphene

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Reduced Graphene Oxide for Li-Air Batteries: The Effect of Oxidation Time and Reduction Conditions for Graphene Oxide

Abstract: not Available.

Cited by 6 publications

References 34 publications

Chemical Oxidation of Graphite: Evolution of the Structure and Properties

Chemical Oxidation of Graphite: Evolution of the Structure and Properties

Spinel LiMn2O4 Nanoparticles Grown in Situ on Nitrogen-Doped Reduced Graphene Oxide as an Efficient Cathode for a Li-O2/Li-Ion Twin Battery

Green and Mild Oxidation: An Efficient Strategy toward Water-Dispersible Graphene

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Product

Resources

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Spinel LiMn₂O₄ Nanoparticles Grown in Situ on Nitrogen-Doped Reduced Graphene Oxide as an Efficient Cathode for a Li-O₂/Li-Ion Twin Battery