Defect engineering in Boron Nitride for catalysis

Ding, Yi; Torres-Davila, Fernand; Khater, Ahmad G. A.; Nash, David J.; Blair, Richard G.; Tetard, Laurene

doi:10.1557/mrc.2018.113

Cited by 27 publications

(21 citation statements)

References 40 publications

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“…Two core peaks were identified at 808 and 1370 cm −1 which are thought to be associated with B-N-B (bending vibrations) and B-N (stretching vibration). The latter peak is associated with bending vibration A 2u mode (out-plane) while the former peak coincides well with stretching vibration E 1u mode (in-plane) [42,43]. Furthermore, peaks at 1020, 1160, and 1672 cm −1 were consistent with C-O, B-N-O, and C=O bond, respectively [44].…”

Section: Resultsmentioning

confidence: 56%

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

et al. 2020

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Two-dimensional layered materials doped with transition metals exhibit enhanced magnetization and improved catalytic stability during water treatment leading to potential environmental applications across several industrial sectors. In the present study, cobalt (Co)-doped boron nitride nanosheets (BN-NS) were explored for such an application. Chemical exfoliation process was used to exfoliate BN-NS and the hydrothermal route was adopted to incorporate Co dopant in various concentrations (e.g., 2.5, 5, 7.5, and 10 wt%). X-ray diffraction (XRD) study indicated that crystallinity improved upon doping with the formation of a hexagonal phase of the synthesized material. Selected area electron diffraction (SAED) confirmed enhanced crystallinity, which corroborates XRD results. Interlayer spacing was evaluated through a high-resolution transmission electron microscope (HR-TEM) equipped with Gatan digital micrograph software. Compositional and functional group analysis was undertaken with energy dispersive Xray (EDS) and Fourier transform infrared (FTIR) spectroscopy, respectively. Field emission scanning electron microscope (FE-SEM) and HR-TEM were utilized to probe surface morphologies of prepared samples. Bonding modes in the sample were identified through Raman analysis. Optical properties were examined using UV-vis spectroscopy. Photoluminescence spectra were acquired to estimate the separation and recombination of excitons. Magnetic properties were studied by means of hysteresis loop acquired using VSM measurements. Methylene blue dye was degraded with as-prepared host and doped nanosheets used as catalysts and investigated through absorption spectra ranging from 250 to 800 nm. The experimental results of this study indicate that Co-doped BN-NS showed enhanced magnetic properties and can be used to degrade dyes present as an effluent in industrial wastewater.

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Section: Resultsmentioning

confidence: 56%

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

et al. 2020

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“…We next collected Raman spectra of the BN material, focusing on the E 2g phonon mode at ∼1371 cm –1 , which arises from in-plane vibrations of N and B in opposing directions . Its broadness and location are measures of defectiveness . The as-received BN powder was relatively defective (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Efficient Photocatalytic PFOA Degradation over Boron Nitride

Duan

Wang

Heck

et al. 2020

Environ. Sci. Technol. Lett.

121

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Concern over water contamination by per/polyfluoroalkyl substances (PFAS) has highlighted the lack of effective treatment approaches. Photocatalysis offers advantages of using ambient conditions for reaction, air as the oxidant, and light as the energy source, but identifying photoactive materials is challenging. Herein, we report that boron nitride (BN) degrades PFOA upon irradiation with 254 nm light. The ability of BN to degrade PFOA photocatalytically has previously been unreported and is unexpected, because its band gap is too large for light absorption. On the basis of scavenger results, we suggest that PFOA degrades in the presence of BN via a hole-initiated reaction pathway similar to the TiO 2 case and involves superoxide/hydroperoxyl and hydroxyl radicals. We surmised that defects allow BN to absorb in the UVC range and to photogenerate reactive oxygen species. Sealed batch studies indicated BN was ∼2 and ∼4 times more active than TiO 2 , before and after ball milling the material, respectively. BN can be reused, showing no decrease in activity over three cycles. BN was active for the photocatalytic degradation of GenX, another PFAS of concern. These findings present fresh opportunities for materials design and for the re-evaluation of other wide band gap semiconductors for PFAS photocatalytic degradation.

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“…Furthermore, the FT-IR spectrum of Co 3 O 4 /h-BN shows characteristic peaks for hexagonal born nitride. The performed FT-IR spectral studies showed two strong absorption bands located at 1375 cm −1 and 813.24 cm −1 attributed to the in-plane B-N stretching vibrations and out-of-plane B-N-B bending vibrations of h-BN, respectively, while the band at 2530.47 cm −1 is assigned to the B-H bond 29 . In addition, the FT-IR spectrum shows peaks around 1629.71 cm −1 and 2794.52 cm −1 , corresponding to C=O bonds and aliphatic C-H, respectively.…”

Section: Resultsmentioning

confidence: 99%

Two dimensional (2D) reduced graphene oxide (RGO)/hexagonal boron nitride (h-BN) based nanocomposites as anodes for high temperature rechargeable lithium-ion batteries

Mussa

Ahmed

Arsalan

et al. 2020

Sci Rep

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With lithium-ion (li-ion) batteries as energy storage devices, operational safety from thermal runaway remains a major obstacle especially for applications in harsh environments such as in the oil industry. In this approach, a facile method via microwave irradiation technique (MWI) was followed to prepare co 3 o 4 /reduced graphene oxide (RGO)/hexagonal boron nitride (h-BN) nanocomposites as anodes for high temperature li-ion batteries. Results showed that the addition of h-BN not only enhanced the thermal stability of Co 3 o 4 /RGO nanocomposites but also enhanced the specific surface area. co 3 o 4 /RGO/h-BN nanocomposites displayed the highest specific surface area of 191 m 2 /g evidencing the synergistic effects between RGO and h-BN. Moreover, Co 3 o 4 /RGO/h-BN also displayed the highest specific capacity with stable reversibility on the high performance after 100 cycles and lower internal resistance. Interestingly, this novel nanocomposite exhibits outstanding high temperature performances with excellent cycling stability (100% capacity retention) and a decreased internal resistance at 150 °C. Li-ion batteries energy storage devices are used as a power source for almost all electronic devices due to the superior benefits over other types of batteries 1-4. However, the safety feature and the narrow temperature operating range of li-ion batteries remain a major obstacle for more complex applications of li-ion batteries such as in the oil industry, defense, automotive applications and aerospace that demand safe operation at wide temperature range (up to 150 °C). Li-ion batteries are known to operate effectively between −20 °C and 60 °C 5. With the increasing demand for li-ion batteries, many research has been made on increasing its thermal stability and the upper operating temperature range. When considering safety issues of li-ion batteries it is mainly related to thermal runaway. Conditions such as elevated temperature and high charge levels or overcharging abuses one or more of the battery components that results in what is called a short circuit leading to heat, fire or explosion. A process referred to as thermal runaway 6. Thermal runaway mechanisms occur mainly at the electrodes and electrolytes. Thermal decomposition of the electrodes or electrolytes and reduction or oxidation of the electrolyte is the main cause of thermal runaways. To solve this issue, many preventative measures have been investigated. Preventative measures can be the use of safety devices, that is, design devices that release high pressure and heat before thermal runaway but this is for engineers to set up new safe li-ion battery devices. However, what concerns scientists more is the inherent safety from electrodes, to electrolytes 7. Compromising between the electrochemical performances and thermal stability is a challenge.

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Defect engineering in Boron Nitride for catalysis

Abstract: Abstract

Cited by 27 publications

References 40 publications

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

Efficient Photocatalytic PFOA Degradation over Boron Nitride

Two dimensional (2D) reduced graphene oxide (RGO)/hexagonal boron nitride (h-BN) based nanocomposites as anodes for high temperature rechargeable lithium-ion batteries

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