Synthesis and characterization of boron-doped carbons

Cermignani, W.; Paulson, Thomas E.; Önneby, C.; Pantano, Carlo G.

doi:10.1016/0008-6223(94)00160-2

Cited by 199 publications

(109 citation statements)

References 10 publications

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“…Oxygen is not detected in any deposit. The maximum of boron incorporation is not limited to 15-17 at.% as reported in previous works [8,9]. On the other hand, the composition is found to be rather homogeneous through the thickness obtained with 70% of BCl 3 (Fig.…”

Section: Chemical Analysissupporting

confidence: 81%

“…An apparent coherent length, L c , was also deduced from the FWHM of the 002 diffraction band by Scherrer equation, in order to compare the different materials. Transmission electron microscopy was also used (TEM) (8) . Cross sections for TEM were obtained as deposits on single fibers.…”

Section: Characterizationmentioning

confidence: 99%

“…Ion implantation can dope the surface region with up to 12 at.% boron, as interstitial and substitutional atoms, metastable phases and vacancies [8]. Chemical vapour deposition (CVD) is a more suitable technique to prepare carbon materials with a high content of homogeneously distributed boron, as reported by Way et al [9] and Cermignani et al [8]. These authors have prepared B x C 1-x materials from BCl 3 -C 6 H 6 gaseous mixtures and obtained maximum boron contents of 15-17 at.%.…”

Section: Introductionmentioning

confidence: 99%

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LPCVD and characterization of boron-containing pyrocarbon materials

Jacques

Guette

Bourrat

et al. 1996

Carbon

146

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Pyrocarbon materials containing various amounts of boron have been prepared by LPCVD from BCl 3 -C 3 H 8 -H 2 precursor mixtures. The growth rate is increased with respect to pure pyrocarbon deposition. By increasing BCl 3 / (C 3 H 8 + BCl 3 ) ratio up to 85%, the incorporation of boron can reach 33 at.%. A small amount of boron (e.g. 8 at.%) highly enhances the anisotropy of pyrocarbon, as evidenced by optical microscopy, X-ray diffraction and transmission electron microscopy (selected area diffraction and lattice fringes techniques). X-ray photoelectron spectroscopy has shown that a large fraction of the boron atoms are included by substitution in the carbon layers, the remaining boron atoms belongs to a boron-rich amorphous part of the material. As boron content increases beyond 8 at.%, the anisotropy of the boron-rich pyrocarbon decreases, due to the limited growth and stacking of the carbon layers. Also, amorphous boron-rich regions are more and more abundant as the total amount of boron increases. The oxidation resistance of the C(B) materials is better than that of pure pyrocarbon. It is mainly due to the improvement of the structural organization for the low boron content materials and to the coating of the whole material with a stable boron oxide for materials with a higher boron content.

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Section: Chemical Analysissupporting

confidence: 81%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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LPCVD and characterization of boron-containing pyrocarbon materials

Jacques

Guette

Bourrat

et al. 1996

Carbon

146

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“…The effect of boron doping and of boron oxide deposition was observed by Wu and Radovic [41] [50] identified the presence of boron oxycarbides rather than B 2 O 3 following a four-hour oxidation at 600°C. The need for oxygen to diffuse through the encapsultaing B 2 O 3 or boron oxycarbides may be another factor for the reduction in the rate of the catalytic oxidation as reported by Wu and Radovic [41].…”

mentioning

confidence: 92%

A review of the catalytic oxidation of carbon–carbon composite aircraft brakes

Bevilacqua

Babutskyi

Chrysanthou

2015

Carbon

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The use of de-icing chemicals at airport runways has been shown to produce oxides and carbonates of sodium, potassium and calcium which catalyse the oxidation of carbon-carbon composite aircraft brakes leading to an increase of the oxidation rate by an order of magnitude. This review reports on studies that have characterised the catalytic oxidation and discusses the mechanism of the catalytic reaction based on investigations that were carried out with both C-C composites and carbon as a fossil fuel. The alkali metal oxides/carbonates are more active catalysts and in their case, the redox reaction between the monoxides and the peroxides has been identified as the most likely catalysis mechanism. In order to reduce or eliminate the problem of catalysis, doping with boron or phosphorus compounds has been investigated by a number of researchers. The effect of these along with the use of protective coatings is also reviewed.3

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“…Consequently, a wide range of alternative carbon-based materials has been investigated, such as graphitized carbon, carbon nanotubes, aerogels and more recently, graphene (6,7). An emerging trend is to dope the carbon support materials with heteroatoms such as sulphur, phosphorous and boron (8)(9)(10)(11)(12)(13)(14)(15)(16), which may enhance the metal -particle interactions, and hence improve stability. Several studies have also shown that the presence of nitrogen in carbon improves both durability and catalytic activity (17)(18)(19)(20)(21).…”

Section: Introductionmentioning

confidence: 99%

Graphitic Carbon Nitride-Graphene Hybrid Nanostructure as a Catalyst Support for Polymer Electrolyte Membrane Fuel Cells

et al. 2016

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Graphitic carbon nitrides form a class of semiconducting graphenelike polymeric materials with visible light absorption and photocatalytic properties. In addition to high nitrogen content and tunable structure, it was shown that graphitic carbon nitride based on polytrazine imide (PTI) sheets exhibit excellent anti-corrosion ability in ex-situ fuel cell environments. However, in bulk form, their low surface area and poor conductivity limits their applications in fuel cells. In this work, PTI was exfoliated to form an ink made from single to few-layer nanosheets. The ink was then processed to produce 3D networks of carbon nitride nanosheets/reduced graphene oxide (PTI-rGO) hybrid aerogel with large interconnecting pores for fast mass transport of reactants and high surface area. The material was decorated with platinum nanoparticles, and then investigated for its electrochemical properties and applications as a catalyst support for polymer electrolyte membrane (PEM) fuel cells. Initial results show that the cathode catalytic activity of Pt/rGO-PTI hybrid is significantly improved in comparison to Pt/PTI or Pt/rGO. In addition, the insitu fuel cell performance of Pt/PTI as anode catalyst is comparable to commercial Pt/C especially at low densities, making it attractive as an alternative, durable anode catalyst support material to conventional carbon black.

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Synthesis and characterization of boron-doped carbons

Cited by 199 publications

References 10 publications

LPCVD and characterization of boron-containing pyrocarbon materials

LPCVD and characterization of boron-containing pyrocarbon materials

A review of the catalytic oxidation of carbon–carbon composite aircraft brakes

Graphitic Carbon Nitride-Graphene Hybrid Nanostructure as a Catalyst Support for Polymer Electrolyte Membrane Fuel Cells

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