Catalyzed synthesis of rhombohedral boron nitride in sodium chloride molten salt

Ye, Linfeng; Liang, Feng; Zhao, Lei; He, Xuan; Fang, Wei; Chen, Hui; Wang, Xin; Wu, Jinfeng; An, Shihua

doi:10.1016/j.ceramint.2016.04.062

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…The XRD pattern is in good agreement with the crystalline boron oxide (B 2 O 3 ) with JCPDS card No. 44-1085, which constitute of two main peaks at 2θ values of 27.8° and 40.1° that correspond to (3 1 0) and (4 2 0) crystal planes of B 2 O 3 . , In the case of the Ni 20 @B/GNF-H catalyst, beside boron peaks, extra peaks are found at 2θ of 16.2°, 30.8°, 44.3°, and 51.6° corresponding to (1 1 0), (1 0 1), (1 1 1), and (2 0 0) crystal planes of doped nickel in the catalyst. The XRD data of Co 20 @B/GNF-H catalyst were indexed to Co 9 S 8 (JCPDS card no.…”

Section: Resultsmentioning

confidence: 98%

Co-, Ni-Catalyzed Borylation of Carbon Nanofibers for Oxygen Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Das

Kesh

Akula

et al. 2022

ACS Appl. Energy Mater.

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In an attempt to develop nonprecious metal electrocatalyst, herein, we report borylation of graphitic carbon nanofiber (GNF) and codoping of Co, Ni toward a oxygen reduction reaction (ORR) catalyst and their application in anion exchange membrane fuel cells (AEMFCs). Boron (B) doping in a carbon matrix creates a C–B bond with lower bond energy to facilitate insertion of metal atoms in the carbon matrix beneficial for ORR activity. Ni and Co doping individually and in combination with the B/GNF increases positive charge clouds surrounding metal centers and facilitates O2 adsorption and catalytic activity. The DFT studies on the catalysts are extensively carried out to measure the band gaps, atomic compositions of frontier molecular orbitals, and charge clouds distribution on the catalysts and correlated with the electrochemical findings. Further, Ni and Co doping creates positive charge cloud, facilitating O2 adsorption through lowering the band gap. Synergistic effect of Ni and Co in the catalyst (Ni20Co20@B/GNF-H) toward ORR activity is clearly established and later demonstrated in an anion exchange membrane fuel cells (AEMFCs) as a potential cathode catalyst. Ni20Co20@B/GNF-H showed an eminent ORR activity, competent CH3OH tolerance in alkaline medium without much decrease in ORR activity even after 10,000 potential cycles. Assessing the fuel cell performance evaluation in AEMFC, Ni20Co20@B/GNF-H catalyst, delivers a peak power density of ∼70 mW cm–2 at a load current density of ∼138 mA cm–2 under ambient pressure and temperature. This nonprecious boron-functionalized GNF-H catalyst opens an era toward the development of a low cost, highly efficient metal based cathodic ORR electrocatalyst for AEMFC applications.

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Section: Resultsmentioning

confidence: 98%

Co-, Ni-Catalyzed Borylation of Carbon Nanofibers for Oxygen Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Das

Kesh

Akula

et al. 2022

ACS Appl. Energy Mater.

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“…The lattice spacing of the BN in the smooth area is 0.34 nm, which corresponds to the (003) plane of r-BN (3.334 Å, ICDD No. 00-045-1171) 13 , indicating that the BN nanoflakes grew in a direction perpendicular to the (003) crystal plane. This directly confirms our interpretation of the phenomenon shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Ye et al . 13 prepared r-BN powders by using Na 2 B 4 O 7 and Mg as raw materials at 1000 °C for 3 h under a nitrogen atmosphere with NaCl molten salt. The prepared BN was not high in purity and it contained h-BN, and the reaction temperature was high.…”

Section: Introductionmentioning

confidence: 99%

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Chen

Wang

et al. 2019

Sci Rep

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r-BN nanoflakes were synthesized using KBH4 and NH4Cl as the main raw material in a high-purity nitrogen atmosphere. The effects of salt and salt-free conditions and heating temperature on the synthesis of BN were studied. The molten-salt method was used to synthesize BN at 650 °C, which was 250 °C lower than the BN synthesis method without salt. Furthermore, at 1000 °C the prepared flake-like BN crystals showed good crystallinity, uniform morphology, a particle diameter of 200–300 nm, and a thickness of 40–70 nm. Moreover, the specific surface area of BN was 294.26 m2/g. In addition, the BN synthesized at 1100 °C had a large elastic modulus value and good oxidation resistance.

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“…[31] When the layered structure of h-BN presents a regular inclined stacking, r-BN is formed and the hybridization mode is unchanged. [32] w-BN can be obtained from h-BN under the condition of shock wave. h-BN and c-BN are in a thermodynamically stable structure, [33] while r-BN and w-BN are in a metastable state, so the current research focuses on h-BN and c-BN.…”

Section: Introductionmentioning

confidence: 99%

“…The hardness of c‐BN is only inferior to diamond, [30] B and N atoms are hybridized by sp 3 , and the bonding mode between atoms in the crystal is covalent bond [31] . When the layered structure of h‐BN presents a regular inclined stacking, r‐BN is formed and the hybridization mode is unchanged [32] . w‐BN can be obtained from h‐BN under the condition of shock wave.…”

Section: Introductionmentioning

confidence: 99%

The Properties and Preparation Methods of Different Boron Nitride Nanostructures and Applications of Related Nanocomposites

Pan

Liu

et al. 2020

The Chemical Record

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Due to special non-metallic polar bond between the III group (with certain metallic properties) element boron (B) and the V group element nitrogen (N), boron nitride (BN) has unique physical and chemical properties such as strong high-temperature resistance, oxidation resistance, heat conduction, electrical insulation and neutron absorption. Its unique lamellar, reticular and tubular morphologies and physicochemical properties make it attractive in the fields of adsorption, catalysis, hydrogen storage, thermal conduction, insulation, dielectric substrate of electronic devices, radiation protection, polymer composites, medicine, etc. Therefore, the synthesis and properties of BN derived materials become the main research hotspots of lowdimensional nanomaterials. This paper reviews the synthetic methods, overall properties, and applications of BN nanostructures and nanocomposites. In addition, challenges and prospect of this kind of materials are discussed.

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Catalyzed synthesis of rhombohedral boron nitride in sodium chloride molten salt

Cited by 12 publications

References 39 publications

Co-, Ni-Catalyzed Borylation of Carbon Nanofibers for Oxygen Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Co-, Ni-Catalyzed Borylation of Carbon Nanofibers for Oxygen Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

The Properties and Preparation Methods of Different Boron Nitride Nanostructures and Applications of Related Nanocomposites

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