A few-layer graphene–graphene oxide composite containing nanodiamonds as metal-free catalysts

Thanh, Tung Tran; Ba, Housseinou; Truong‐Phuoc, Lai; Nhut, Jean‐Mario; Ersen, Ovidiu; Bégin, Dominique; Janowska, Izabela; Nguyen, Dinh Lam; Granger, Pascal; Pham‐Huu, Cuong

doi:10.1039/c4ta01307g

Cited by 63 publications

(48 citation statements)

References 41 publications

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“…[1][2][3][4][5][6] Carbon nanotubes, as one of the typical and commercially available nanocarbon materials, have been generally used as a support to fabricate supported metals and their derivatives catalysts for diverse reactions. [1][2][3][4][5][6] Carbon nanotubes, as one of the typical and commercially available nanocarbon materials, have been generally used as a support to fabricate supported metals and their derivatives catalysts for diverse reactions.…”

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confidence: 99%

“…The PAA process possibly produces more surface oxygen, and therefore the surface oxygen can remove the CNx that View Article Online would be formed by the pyrolysis of melamine, which can increase the structural defects. [1][2][3][4][5][6] The surface phenolic hydroxyl group and/or possible COOH may promote the cracking of ethylbenzene due to its acidity, because acidic sites are active for facilitating the cracking reaction of hydrocarbons. In comparison with A-CNT, A-M-CNT has a little lower I D /I G ratio, which may be caused by the protective role of melamine.…”

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confidence: 99%

“…However, no peaks corresponding to the (100) and (111) planes for M-CNT can be efficiently resolved. [1][2][3][4][5][6][33][34][35] The more surface ketonic CQO groups and the higher accessibility of active sites by removing the CNx layers on the A-M-CNT may allow it to be a superior catalyst to M-CNT for the DDH reaction of ethylbenzene. The increased structural defects and the disappearance of CNx layers confirmed by HRTEM and Raman characterization render the A-M-CNT to be a superior catalyst to M-CNT and pristine CNT for the DDH reaction.…”

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confidence: 99%

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Nitrogen-doped carbon nanotubes via a facile two-step approach as an efficient catalyst for the direct dehydrogenation of ethylbenzene

Zhao

Dai

et al. 2015

Phys. Chem. Chem. Phys.

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A novel and efficient nitrogen-doped carbon nanotube (A-M-CNT) catalyst has been prepared by a facile two-step method, including prior air activation and subsequent pyrolysis of the carbon nanotubes with melamine. The as-synthesized A-M-CNT affords superior catalytic activity to the nitrogen-doped CNT without air activation (M-CNT) and pristine CNT, ascribed to its unique microstructure and surface chemical properties.

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confidence: 99%

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Nitrogen-doped carbon nanotubes via a facile two-step approach as an efficient catalyst for the direct dehydrogenation of ethylbenzene

Zhao

Dai

et al. 2015

Phys. Chem. Chem. Phys.

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“…Consistent with the morphology from SEM, the etching effect of the treatment made the GFs with an extremely rough surface and much more macroscopic carbon fragments. Moreover, the G band shifted to the higher wavenumber by about 8 cm −1 , which may be attributed to the oxygen-containing functional groups generated on the surface of treated samples and confirmed by the results of XPS and temperature-programmed desorption (TPD), such as the O-H bending and C=O stretching [41]. The physical characteristics of the samples after acid treatment with different durations are summarized in Table 1.…”

Section: Characteristics Of the Acid Treated Graphite Feltsmentioning

confidence: 78%

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

Duong‐Viet

et al. 2018

Catalysts

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Abstract:In this study, we reported on the influence of gaseous HNO 3 treatment on the formation of defects decorated with oxygenated functional groups on commercial graphite felts (GFs). The gaseous acid treatment also leads to a remarkable increase of the specific as well as effective surface area through the formation of a highly porous graphite structure from dense graphite filamentous. The as-synthesized catalyst was further used as a metal-free catalyst in the selective oxidation of H 2 S in industrial waste effluents. According to the results, the defects decorated with oxygenated groups were highly active for performing selective oxidation of H 2 S into elemental sulfur. The desulfurization activity was relatively high and extremely stable as a function of time on stream which indicated the high efficiency of these oxidized un-doped GFs as metal-free catalysts for the selective oxidation process. The high catalytic performance was attributed to both the presence of structural defects on the filamentous carbon wall, which acting as a dissociative adsorption center for the oxygen, and the oxygenated functional groups, which could play the role of active sites for the selective oxidation process.

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“…Diamond nanoparticles have been applied as corrosion inhibition [117], and as the metal-free catalysts for oxidant-and steam-free dehydrogenation [118,140]. For example, the nanocomposite of polyaniline and diamond nanoparticles showed an ohmic junction and wide potential values, independent of redox characteristics of both polyaniline and diamond nanoparticles.…”

Section: Other Applicationsmentioning

confidence: 98%

Diamond Nanostructures and Nanoparticles: Electrochemical Properties and Applications

Yang

Jiang

2016

Carbon Nanoparticles and Nanostructures

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Macro-sized diamond films have been widely applied as the electrode for electrochemical and electroanalytical applications. Due to the non-uniform doping in diamond, boundary effects, and the varied ratios of graphite to diamond, only averaged electrochemical signals are detected over the full electrode. The studies of diamond electrochemistry at the nanoscale are thus highly required. In this chapter we overview recent progress and achievements about electrochemical properties and applications of diamond nanostructures and nanoparticles. After a brief introduction of the formation of these nanostructures and nanoparticles, electrochemical behavior of diamond nanostructures (e.g., diamond nanotexures, nanowires, networks, etc.) and nanoparticles (undoped, doped nanoparticles) in the presence/ absence of redox probes is summarized. Their electroanalytical (e.g., electrochemical, biochemical sensing, etc.) and electrochemical (e.g., energy storage using capacitors and batteries, electrocatalysis, etc.) applications are shown. Diamond nanoelectrode array is introduced and highlighted as a promising tool to investigate diamond electrochemistry at the nanoscale as well.

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A few-layer graphene–graphene oxide composite containing nanodiamonds as metal-free catalysts

Abstract: Graphene oxide mediated exfoliation of expanded graphite in aqueous solution and incorporated nanodiamonds as metal-free catalysts.

Cited by 63 publications

References 41 publications

Nitrogen-doped carbon nanotubes via a facile two-step approach as an efficient catalyst for the direct dehydrogenation of ethylbenzene

Nitrogen-doped carbon nanotubes via a facile two-step approach as an efficient catalyst for the direct dehydrogenation of ethylbenzene

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

Diamond Nanostructures and Nanoparticles: Electrochemical Properties and Applications

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