Boron-doped diamond synthesized at high-pressure and high-temperature with metal catalyst

2017 ◽  
Vol 103 ◽  
pp. 224-237 ◽  
Author(s):  
Fedor M. Shakhov ◽  
Andrey M. Abyzov ◽  
Sergey V. Kidalov ◽  
Andrei A. Krasilin ◽  
Erkki Lähderanta ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Metal Catalyst ◽  
Boron Doped Diamond ◽  
Boron Doped

scholarly journals High Pressure High Temperature Synthesis of Highly Boron Doped Diamond Microparticles and Porous Electrodes for Electrochemical Applications

2020 ◽  
Author(s):  
Georgia Wood ◽  
Mark Newton ◽  
Viacheslav Shkirskiy ◽  
Patrick R. Unwin ◽  
Julie Macpherson ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Vapor ◽  
Porous Electrodes ◽  
Boron Doped Diamond ◽  
Voltammetric Analysis ◽  
Boron Doped ◽  
Electrochemical Applications ◽  
High Pressure High Temperature ◽  
Aqueous Solvent

<p>High pressure high temperature (HPHT) synthesis of crystallographically well-defined boron doped diamond (BDD) microparticles, suitable for electrochemical applications and using the lowest P and T (5.5 GPa and 1200°C) growth conditions to date, is reported. This is aided through the use of a metal (Fe-Ni) carbide forming catalyst and an aluminum dibromide (AlB<sub>2</sub>) boron source. The latter also acts as a nitrogen sequester, to reduce boron-nitrogen charge compensation effects. Raman microscopy and electrochemical measurements on individual microparticles reveal they are suitably doped to be considered metallic-like and contain negligible sp<sup>2</sup> bonded carbon. A compaction process is used to create macroscopic porous electrodes from the BDD microparticles. Voltammetric analysis of the one-electron reduction of Ru(NH<sub>3</sub>)<sub>6</sub><sup>3+</sup> reveals large capacitive and resistive components to the current-voltage curves, originating from solution trapped within the porous material. Scanning electrochemical cell microscopy (SECCM) is employed to map the local electrochemical activity and porosity at the micron scale. These electrodes retain the advantageous properties of polycrystalline BDD grown by chemical vapor deposition, such as large aqueous solvent window and resistance to corrosion, but with the additional benefits of a high, electrochemically accessible, surface area. </p>

scholarly journals High Pressure High Temperature Synthesis of Highly Boron Doped Diamond Microparticles and Porous Electrodes for Electrochemical Applications

2020 ◽  
Author(s):  
Georgia Wood ◽  
Mark Newton ◽  
Viacheslav Shkirskiy ◽  
Patrick R. Unwin ◽  
Julie Macpherson ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Vapor ◽  
Porous Electrodes ◽  
Boron Doped Diamond ◽  
Voltammetric Analysis ◽  
Boron Doped ◽  
Electrochemical Applications ◽  
High Pressure High Temperature ◽  
Aqueous Solvent

<p>High pressure high temperature (HPHT) synthesis of crystallographically well-defined boron doped diamond (BDD) microparticles, suitable for electrochemical applications and using the lowest P and T (5.5 GPa and 1200°C) growth conditions to date, is reported. This is aided through the use of a metal (Fe-Ni) carbide forming catalyst and an aluminum dibromide (AlB<sub>2</sub>) boron source. The latter also acts as a nitrogen sequester, to reduce boron-nitrogen charge compensation effects. Raman microscopy and electrochemical measurements on individual microparticles reveal they are suitably doped to be considered metallic-like and contain negligible sp<sup>2</sup> bonded carbon. A compaction process is used to create macroscopic porous electrodes from the BDD microparticles. Voltammetric analysis of the one-electron reduction of Ru(NH<sub>3</sub>)<sub>6</sub><sup>3+</sup> reveals large capacitive and resistive components to the current-voltage curves, originating from solution trapped within the porous material. Scanning electrochemical cell microscopy (SECCM) is employed to map the local electrochemical activity and porosity at the micron scale. These electrodes retain the advantageous properties of polycrystalline BDD grown by chemical vapor deposition, such as large aqueous solvent window and resistance to corrosion, but with the additional benefits of a high, electrochemically accessible, surface area. </p>

scholarly journals High-pressure / High-temperature Synthesis and Characterization of Boron-doped Diamond

2006 ◽  
Vol 61 (12) ◽  
pp. 1561-1565 ◽  
Author(s):  
Natalia Dubrovinskaia ◽  
Leonid Dubrovinsky ◽  
Nobuyoshi Miyajima ◽  
Falko Langenhorst ◽  
Wilson A. Crichton ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Pressures ◽  
Direct Reaction ◽  
X Ray Diffraction ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

Bulk samples (with volumes up to ~ 7.5 mm3) of boron-doped diamonds (BDD) were synthesized by means of direct reaction between boron carbide and graphite in a multianvil apparatus at high pressures and high temperatures (HPHT). X-ray diffraction data revealed the presence in BDD of a very small amount of a highly boron-enriched phase (B50C2) and traces of the B13C2 used as an initial material. The absence of B50C2 in the product of treatment of pure B13C2 under the same HPHT conditions suggests that boron-rich carbides exsolute from diamond on quenching leading to boron depletion of the diamond matrix. These observations imply that boron solubility in diamond increases at high pressure and high temperature. This result may have important implications for the understanding of the mechanism of boron incorporation into diamond at HPHT synthesis and for the interpretation of the data on superconductivity of polycrystalline BDD.

Preparation and properties of boron-doped diamond composites fabricated by high-pressure and high-temperature sintering

2019 ◽  
Vol 45 (7) ◽  
pp. 9271-9277 ◽  
Author(s):  
Kehao Zhang ◽  
Hailong Wang ◽  
Gang Shao ◽  
Wen Liu ◽  
Bingbing Fan ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Boron Doped Diamond ◽  
Boron Doped

scholarly journals Electrochemical Ozone Generation Using Compacted High Pressure High Temperature Synthesized Boron Doped Diamond Microparticle Electrodes

2021 ◽  
Author(s):  
Georgia F Wood ◽  
Irina M Terrero Rodriguez ◽  
Josh J Tully ◽  
Shay Chaudhuri ◽  
Julie V. Macpherson
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Vapor ◽  
High Volume ◽  
Green Technology ◽  
Ozone Production ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
High Pressure High Temperature ◽  
First Time

Abstract Electrochemical ozone production (EOP) from water is an attractive, green technology for disinfection. Boron doped diamond (BDD) electrodes, grown by chemical vapor deposition (CVD), have been widely adopted for EOP due to their wide anodic window in water and excellent chemical and electrochemical stability. High pressure high temperature (HPHT) synthesis, an alternative growth technique used predominantly for the high-volume synthesis of nitrogen doped diamond microparticles, has been seldom employed for the production of conductive BDD electrodes. In this letter, we demonstrate, for the first time, the use of BDD electrodes fabricated from HPHT conductive BDD microparticles for EOP. The BDD microparticles are first compacted to produce freestanding solid electrodes and then laser micromachined to produce a perforated electrode. The compacted HPHT BDD microparticle electrodes are shown to exhibit high EOP, producing 2.23 ± 0.07 mg L-1 of ozone per ampere of current, at consistent levels for a continuous 20 hr period with no drop off in performance. The HPHT electrodes also achieve a reasonable current efficiency of 23%, at a current density of 770 mA cm-2.

Electrochemical Ozone Generation Using Compacted High Pressure High Temperature Boron Doped Diamond Microparticle Electrodes

2021 ◽  
Author(s):  
Georgia Wood ◽  
Irina Terrero Rodriguez ◽  
Josh Tully ◽  
Shayantan Chaudhuri ◽  
Julie Macpherson
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Vapor ◽  
High Volume ◽  
Green Technology ◽  
Ozone Production ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
High Pressure High Temperature ◽  
First Time

Electrochemical ozone production (EOP) from water is an attractive, green technology for disinfection. Boron doped diamond (BDD) electrodes, grown by chemical vapor deposition (CVD), have been widely adopted for EOP due to their wide anodic window in water and excellent chemical and electrochemical stability. High pressure high temperature (HPHT) synthesis, an alternative growth technique used predominantly for the high-volume synthesis of nitrogen doped diamond microparticles, has been seldom employed for the production of conductive BDD electrodes. In this letter, we demonstrate, for the first time, the use of BDD electrodes fabricated from HPHT conductive BDD microparticles for EOP. The BDD microparticles are first compacted to produce freestanding solid electrodes and then laser micromachined to produce a perforated electrode. The HPHT BDD electrodes are shown to exhibit high EOP, producing 2.23 ± 0.07 mg L-1 of ozone per ampere of current, at consistent levels for a continuous 20 hr period with no drop off in performance.

High-pressure, high-temperature processing of low-nitrogen boron-doped diamond

2008 ◽  
Vol 44 (4) ◽  
pp. 377-381 ◽  
Author(s):  
A. I. Chepurov ◽  
A. P. Yelisseyev ◽  
E. I. Zhimulev ◽  
V. M. Sonin ◽  
I. I. Fedorov ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
High Pressure High Temperature ◽  
High Temperature Processing ◽  
Low Nitrogen

Effects of hydrogen on diamond single crystal synthesized under high pressure and high temperature

2015 ◽  
Vol 29 (27) ◽  
pp. 1550162 ◽  
Author(s):  
Yong Li ◽  
Xiaopeng Jia ◽  
Mousheng Song ◽  
Hong-An Ma ◽  
Zhenxiang Zhou ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Nitrogen Concentration ◽  
Hall Effect Measurement ◽  
Synthesis Temperature ◽  
Synthesis System ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Before And After ◽  
Diamond Single Crystals

In this paper, diamond single crystals doped with LiH and boron additives were synthesized in [Formula: see text]–[Formula: see text] system under high pressure and high temperature. Under the fixed pressure condition, we found that the synthesis temperature increased slightly after the addition of LiH in the synthesis system. The {100}-orientated surface morphology was investigated by scanning electron microscopy (SEM). The nitrogen concentration in the obtained diamond was analyzed and evaluated using Fourier transmission infrared spectroscopy (FTIR). Furthermore, the electrical properties of Ib-type and boron-doped diamond before and after hydrogenation using Hall effect measurement, which suggested that the conductivity of diamond co-doped with hydrogen and boron was obviously enhanced than that of boron-doped diamond.

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