Effect of hydrogen peroxide on properties of graphene oxide in Hummers method

Yoo, Myung Jin; Park, Ho Bum

doi:10.1016/j.carbon.2018.10.009

Cited by 226 publications

(98 citation statements)

References 43 publications

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“…The characteristic peak of Se is not obvious in the XPS spectra, which may be due to the coating of GO on the surface of PC/Se particles. The C 1s spectra of the PC/Se/GO (Figure 5a) displays five peaks corresponding to C=C, C−C, C−O, >C=O and HOC=O (respectively located at 284.6, 285.2, 287.2, 288.2 and 289.0 eV) by fitting [26,27] . For Se 3d spectra (Figure 5b), two main peaks located at 55.4 and 56.2 eV attributable to the 3d 5/2 and Se 3d 3/2 signals are observed, while a peak at ∼59.6 eV corresponds to Se−O [28] …”

Section: Resultsmentioning

confidence: 98%

“…The C 1s spectra of the PC/Se/GO (Figure 5a) displays five peaks corresponding to C=C, CÀ C, CÀ O, > C=O and HOC=O (respectively located at 284.6, 285.2, 287.2, 288.2 and 289.0 eV) by fitting. [26,27] For Se 3d spectra (Figure 5b), two main peaks located at 55.4 and 56.2 eV attributable to the 3d 5/2 and Se 3d 3/2 signals are observed, while a peak at~59.6 eV corresponds to SeÀ O. [28] N 2 adsorption-desorption isotherms and pore size distributions of samples are exhibited in Figure 5c and d. The specific surface area and average pore size of the porous walnut shell carbon can reach 997.7 m 2 g À 1 and 1.65 nm respectively after potassium hydroxide activation.…”

Section: Resultsmentioning

confidence: 99%

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A Novel Cathode Based on Selenium Confined in Biomass Carbon and Graphene Oxide for Potassium‐Selenium Battery

et al. 2020

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Selenium exhibits smaller volume expansion and much higher electrical conductivity compared with sulfur, which makes it considered as a potential cathode material. In order to improve electrochemical performance of potassium-selenium (KÀ Se) batteries, we prepared porous carbon/Se (PC/Se) composite via carbonization, KOH activation and melt diffusion and synthesized a novel porous carbon/Se/graphene oxide (PC/Se/GO) composite with the Se content of~40 % via controlling the ionic strength of the solution as cathode material in the work. The combination of porous carbon structure and graphene can effectively relieve the volume expansion of selenium during the charge and discharge process, and provide excellent conductivity. The one-step conversion without polyselenides between the PC/Se/GO composite and metal potassium further improves the capacity and cycling stability. Therefore, the PC/Se/GO delivers high discharge capacities of 426.3 and 316.8 mAh g À 1 in the 2nd and 150th cycles at 0.5 C. This work plays an important reference role for the exploration of advanced potassiumselenium batteries.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

A Novel Cathode Based on Selenium Confined in Biomass Carbon and Graphene Oxide for Potassium‐Selenium Battery

et al. 2020

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“…The temperature of the mixture was then raised to 98 °C and stirred overnight. Afterward, 300 mL of 30% H 2 O 2 was introduced into the mixture, which was followed by the addition of 5% HCl solution to remove any metal ions left over [ 30 ]. The resulting solid was washed several times with DI water (until the neutral pH was achieved), separated by vacuum filtration and dried under vacuum (at 50 °C for 24 h) to obtain the GO.…”

Section: Methodsmentioning

confidence: 99%

“…PAN-based NFs were prepared using the optimum electrospinning conditions established by our previous research [ 30 ]. Specifically, the injection flow rate was 1.0 mL/h, voltage power was 10 kV, and the distance between the needle tip and collector was 15 cm.…”

Section: Methodsmentioning

confidence: 99%

Electrospun Composites Made of Reduced Graphene Oxide and Polyacrylonitrile-Based Activated Carbon Nanofibers (rGO/ACNF) for Enhanced CO2 Adsorption

et al. 2020

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In this work, we report the preparation of polyacrylonitrile (PAN)-based activated carbon nanofibers composited with different concentrations of reduced graphene oxide (rGO/ACNF) (1%, 5%, and 10% relative to PAN weight) by a simple electrospinning method. The electrospun nanofibers (NFs) were carbonized and physically activated to obtain activated carbon nanofibers (ACNFs). Texture, surface and elemental properties of the pristine ACNFs and composites were characterized using various techniques. In comparison to pristine ACNF, the incorporation of rGO led to changes in surface and textural characteristics such as specific surface area (SBET), total pore volume (Vtotal), and micropore volume (Vmicro) of 373 m2/g, 0.22 cm3/g, and 0.15 cm3/g, respectively, which is much higher than the pristine ACNFs (e.g., SBET = 139 m2/g). The structural and morphological properties of the pristine ACNFs and their composites were studied by Raman spectroscopy and X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM) respectively. Carbon dioxide (CO2) adsorption on the pristine ACNFs and rGO/ACNF composites was evaluated at different pressures (5, 10, and 15 bars) based on static volumetric adsorption. At 15 bar, the composite with 10% of rGO (rGO/ACNF0.1) that had the highest SBET, Vtotal, and Vmicro, as confirmed with BET model, exhibited the highest CO2 uptake of 58 mmol/g. These results point out that both surface and texture have a strong influence on the performance of CO2 adsorption. Interestingly, at p < 10 bar, the adsorption process of CO2 was found to be quite well fitted by pseudo-second order model (i.e., the chemisorption), whilst at 15 bar, physisorption prevailed, which was explained by the pseudo-first order model.

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“…Recently, Mn 3 O 4 is used in the manufacture of supercapacitors electrode [21]. The addition of Mn 3 O 4 to the nanocmposite can achieve great stability to the charge-discharge process [22,23].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polyaniline/Mn3O4/Reduced Graphene Oxide Nanocomposite

et al. 2019

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T HE present work is concerned with the synthesis and studying the electrical and dielectric properties of Polyaniline (PANI)/Mn 3 O 4 /Reduced Graphene Oxide (RGO) nanocomposites using the Broadband Dielectric Spectroscopy technique. Polyaniline/Mn 3 O 4 and polyaniline/Mn 3 O 4 /RGO nanocomposites were prepared using in-situ polymerization. To investigate the structural and morphology of the prepared samples, XRD, FTIR, HRTEM and SEM techniques were used. XRD results of pure Mn 3 O 4 and PANI showed that PANI has crystallinity to some extent and the formation of Mn 3 O 4 as a major phase with crystallite size ~20 nm is obtained. In case of nanocomposite samples, PANI/Mn 3 O 4 and PANI /Mn 3 O 4 /RGO revealed a slight disappearance of the characteristic peaks of Mn 3 O 4 , which may be attributed to the covering of Mn 3 O 4 surface by PANI. FTIR analysis of the nanocomposite samples indicated that the characteristic absorption peaks are shifted to higher wavenumbers compared with that of pure PANI confirming the interaction between PANI, graphene and Mn 3 O 4. The morphological study of the samples revealed a porous surface of micro aggregates of Mn 3 O 4 and PANI enveloped by RGO sheets and showed the distribution of Mn 3 O 4 nanoparticle and PANI nanofibers on and between the thin sheets of RGO. The value of dc conductivity is rather high, and the prepared nanocomposites could be considered as synthetic metals from the conductivity point of view of such plastic electrode materials.

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Effect of hydrogen peroxide on properties of graphene oxide in Hummers method

Cited by 226 publications

References 43 publications

A Novel Cathode Based on Selenium Confined in Biomass Carbon and Graphene Oxide for Potassium‐Selenium Battery

A Novel Cathode Based on Selenium Confined in Biomass Carbon and Graphene Oxide for Potassium‐Selenium Battery

Electrospun Composites Made of Reduced Graphene Oxide and Polyacrylonitrile-Based Activated Carbon Nanofibers (rGO/ACNF) for Enhanced CO2 Adsorption

Synthesis and Characterization of Polyaniline/Mn3O4/Reduced Graphene Oxide Nanocomposite

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