Characterization of the Materials Synthesized by High Pressure-High Temperature Treatment of a Polymer Derived t-BC2N Ceramic

Matizamhuka, Wallace; Sigalas, Iakovos; Herrmann, Matthias; Dubronvinsky, Leonid; Miyajima, Nobuyoshi; Mera, Gabriela; Riedel, Ralf

doi:10.3390/ma4122061

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…The well-pronounced G band is attributed to the presence of an ideal graphitic lattice vibration mode with E 2g symmetry. These findings are also consistent with the earlier report on amorphous BC 2 N [52]. One can easily notice that G band contribution is more prominent in amorphous BC 4 N compounds.…”

supporting

confidence: 93%

Electrochemical Li Storage Properties of Carbon-Rich B–C–N Ceramics

Bhat

Sasikumar

Molina‐Luna

et al. 2016

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Amorphous BCN ceramics were synthesized via a thermal conversion procedure of piperazine-borane and pyridine-borane. The synthesized BC 2 N and BC 4 N ceramics contained, in their final amorphous structure, 45 and 65 wt % of carbon, respectively. Elemental analysis revealed 45 and 65 wt % of carbon for BC 2 N and BC 4 N, respectively. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) confirmed the amorphous nature of studied compounds. Lateral cluster size of carbon crystallites of 7.43 and 10.3 nm for BC 2 N and BC 4 N, respectively, was calculated from Raman spectroscopy data. This signified a higher order of the carbon phase present in BC 4 N. The electrochemical investigation of the low carbon BC 2 N composition as anodes for Li-ion batteries revealed initial capacities of 667 and 235 mAh¨g´1 for lithium insertion/extraction, respectively. The material with higher carbon content, BC 4 N, disclosed better reversible lithium storage properties. Initial capacities of 1030 and 737 mAh¨g´1 for lithium insertion and extraction were recovered for carbon-rich BC 4 N composition. Extended cycling with high currents up to 2 C/2 D revealed the cycling stability of BC 4 N electrodes. Cycling for more than 75 cycles at constant current rates showed a stable electrochemical behavior of BC 4 N anodes with capacities as high as 500 mAh¨g´1.

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confidence: 93%

Electrochemical Li Storage Properties of Carbon-Rich B–C–N Ceramics

Bhat

Sasikumar

Molina‐Luna

et al. 2016

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“…Crystalline phases can be obtained at high temperatures and high pressures. 146 In spite of the wide range of stable compositions and structures that are available, they are strongly dependent on the deposition method and chemistry (see Chapter 7).…”

Section: Sp 2 -Hybridised Bcxnymentioning

confidence: 99%

Chemical vapour deposition of sp2-hybridised B-C-N materials from organoborons

Souqui

2019

Linköping Studies in Science and Technology. Dissertations

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Up left: top view scanning electron micrograph (SEM) of sp 2 -BN grains and 3C-SiC grains on Si(111). Up right: top view SEM of r-BN grains on ZrB2, surrounded by a-BN. Bottom left: top view SEM of the surface of a 1.5 µm thick r-BN film deposited from TMB covered with a-BN. Bottom right: top view SEM of rhombohedral boron carbide grains on silicon carbide. Back side:Up: cross section SEM of DRAM structures of aspect ratio 60:1 (low magnification) and a-BxC film deep in the trenches (high magnification).Bottom, from left to right: top view SEM of sp 2 -BCxNy nanowalls deposited from plasma CVD, with increasing degree of disorder and complexity.During the course of research underlying this thesis, Laurent Souqui was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden.

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“…They are formed by coordinating a cyclic amine with a borane group, resulting in the formation of a dative B-N bond. They have found application as precursors in ceramic production 1,2 and as candidates for onboard chemical hydrogen storage. [3][4][5][6][7] Although closelyrelated linear analogues, such as ammonia borane (NH3BH3) [8][9][10][11][12][13][14][15][16] and alkyl amine boranes, [17][18][19][20][21][22][23][24][25][26][27][28] are well characterised, very few CABs have been studied both in terms of their structure and chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Structural and thermochemical studies of pyrrolidine borane and piperidine borane by gas electron diffraction and quantum chemical calculations

et al. 2020

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The gaseous structures, thermochemical properties and dehydrogenation reaction energy profiles of the borane complexes of pyrrolidine and piperidine have been investigated using gas electron diffraction (GED) and state-of-the-art computational methods. These complexes are of interest because of their potential as hydrogen storage materials for future onboard transport applications. A comparative structural and thermochemical analysis revealed structures with a slight difference in the essential B-N bond length, with the piperidine borane having a longer bond even though it has a stronger B-N bond according to predicted bond dissociation energies, a trend common with amine boranes. To identify the most favourable dehydrogenation pathway, BH3-catalysed and uncatalysed dehydrogenation channels have been explored, where the former has been shown to be the favourable process for both complexes. The energy requirements for the hydrogen release reactions are expected to be minimal as evidenced from the calculated dehydrogenation reaction energies, implying their suitability for onboard chemical hydrogen storage.

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Characterization of the Materials Synthesized by High Pressure-High Temperature Treatment of a Polymer Derived t-BC2N Ceramic

Cited by 9 publications

References 34 publications

Electrochemical Li Storage Properties of Carbon-Rich B–C–N Ceramics

Electrochemical Li Storage Properties of Carbon-Rich B–C–N Ceramics

Chemical vapour deposition of sp2-hybridised B-C-N materials from organoborons

Structural and thermochemical studies of pyrrolidine borane and piperidine borane by gas electron diffraction and quantum chemical calculations

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