Nitriding kinetics of amorphous boron in the BN-B system

Rusanova, L. N.; Gorchakova, L. I.

doi:10.1007/bf00798478

Cited by 2 publications

(7 citation statements)

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“…We synthesized boron-doped BNO (B-BNO) through a two-step procedure, based on the previous work of Weng et al 43 and Rusanova and Gorchakova, 45 as outlined below. The first step relies on the bottom-up synthesis of oxygen-doped boron nitride (BNO) using a mixture of boric acid and hexamethylenetetramine under an ammonia atmosphere at 1000 °C, as outlined by Weng et al 43 The second step, outlined by Rusanova and Gorchakova, 45 involves the nitrification of amorphous boron in the presence of the as-synthesized BNO under an inert nitrogen atmosphere at elevated temperatures (>1300 °C) for prolonged time periods.…”

Section: Methodsmentioning

confidence: 99%

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

Shankar¹,

Lubert-Perquel²,

Mistry³

et al. 2020

Preprint

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Developing robust, multifunctional photocatalysts that can facilitate both hydrogen evolution via photoreforming of water and gas phase CO2 photoreduction is highly desirable with the long-term vision of integrated photocatalytic setups. Here, we present a step-change in the family of boron oxynitride materials by introducing the first example of a B-doped boron oxynitride (B-BNO). This material resolves an on-going bottleneck associated with BN-based materials, i.e. the lack of photoactivity under visible light. Detailed EPR studies revealed distinct hyperfine interactions between the free oxygen radicals and 3 neighbouring boron nuclei. This confirmed isolated OB3 sites, which contribute to band gap narrowing, as the radical species and origin of paramagnetism in BNO materials. We show that B-BNO can facilitate both liquid phase H2 evolution and gas phase CO2 photoreduction, using UV-Vis and deep visible irradiation (λ > 550 nm), without any co-catalysts. The evolution rates, quantum efficiencies, and selectivities observed for both reactions with B-BNO exceed those of its porous BNO counterpart, P25 TiO2 and bulk g-C3N4.

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Section: Methodsmentioning

confidence: 99%

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

Shankar¹,

Lubert-Perquel²,

Mistry³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…We synthesized boron-doped BNO (B-BNO) through a two-step procedure, based on the previous work of Weng et al [43] and Rusanova and Gorchakova [48] , as outlined below. The first step relies on the bottom-up synthesis of oxygen-doped boron nitride (BNO) using a mixture of boric acid and hexamethylenetetramine under an ammonia atmosphere at 1000 °C, as outlined by Weng et al [43] .…”

Section: Methodsmentioning

confidence: 99%

“…The first step relies on the bottom-up synthesis of oxygen-doped boron nitride (BNO) using a mixture of boric acid and hexamethylenetetramine under an ammonia atmosphere at 1000 °C, as outlined by Weng et al [43] . The second step, outlined by Rusanova and Gorchakova [48] , involves the nitrification of amorphous boron in the presence of the as-synthesized BNO under an inert nitrogen atmosphere at elevated temperatures (>1300 °C) for prolonged time periods.…”

Section: Methodsmentioning

confidence: 99%

“…The second step of the synthesis involves the nitrification of amorphous boron in the presence of the as-synthesized BNO sample, according to Rusanova and Gorchakova. [48] The as-synthesized BNO sample and amorphous boron powder (>95%, Sigma Aldrich) in a ratio of 75 wt.% : 25 wt.% were mechanically mixed in an agate mortar to form a homogeneous powder, and then transferred to an alumina crucible, which was placed in a horizontal tubular furnace. The furnace was purged under nitrogen flow with a flow rate of 100 cm 3 min -1 overnight after which the sample was heated from ambient temperature to 1500 °C with a ramp rate of 10 °C min -1 under the same nitrogen flow rate.…”

Section: Synthesis Of Boron-doped Boron Oxynitride (B-bno)mentioning

confidence: 99%

“…Upon completion of the synthesis, a light grey powder product was obtained, which we refer to as B-BNO. We chose a synthesis temperature of 1500 °C based on the results of Rusanova and Gorchakova [48] , who showed that full nitrification of amorphous boron was achieved for a synthesis temperature of 1500 °C. We selected a reaction time of 10 hours for the same reason.…”

Section: Synthesis Of Boron-doped Boron Oxynitride (B-bno)mentioning

confidence: 99%

See 2 more Smart Citations

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

Shankar¹,

Lubert-Perquel²,

Mistry³

et al. 2020

Preprint

View full text Add to dashboard Cite

Developing robust, multifunctional photocatalysts that can facilitate both hydrogen evolution via photoreforming of water and gas phase CO2 photoreduction is highly desirable with the long-term vision of integrated photocatalytic setups. Here, we present a new addition to the boron nitride (BN) photocatalyst material platform, boron-doped boron oxynitride (B-BNO), capable of fulfilling this goal. Detailed EPR studies revealed hyperfine interactions between free charges located on discrete OB3 sites, exhibiting an out-of-plane symmetry, and the nuclei of neighbouring boron atoms. This material resolves two long-standing bottlenecks associated to BN-based materials concomitantly: instability in water and lack of photo activity under visible light. We show that B-BNO maintains prolonged stability in water for at least three straight days and can facilitate both liquid phase H2 evolution and gas phase CO2 photoreduction, using UV-Vis and deep visible irradiation (λ > 550 nm), without any cocatalysts. The evolution rates, apparent quantum yields, and selectivities observed for both reactions with B-BNO exceed those of its porous BNO counterpart, P25 TiO2 and bulk g-C3N4. This work provides scope to expand the BN photocatalyst platform to a wider range of reactions.

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Nitriding kinetics of amorphous boron in the BN-B system

Cited by 2 publications

References 1 publication

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

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