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Formation mechanism and porosity development in porous boron nitride

DOI: 10.1021/acs.jpcc.1c08565 DOI Help

Authors: Anouk L'Hermitte (Imperial College London) , Daniel M. Dawson (University of St. Andrew) , Pilar Ferrer (Diamond Light Source) , Kanak Roy (Diamond Light Source) , Georg Held (Diamond Light Source) , Tian Tian (Imperial College London) , Sharon E. Ashbrook (University of St. Andrews) , Camille Petit (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C , VOL 24

State: Published (Approved)
Published: December 2021
Diamond Proposal Number(s): 26588

Abstract: Porous boron nitride (BN) has proven promising as a novel class of inorganic materials in the field of separations and particularly adsorption. Owing to its high surface area and thermal stability, porous BN has been researched for CO2 capture and water cleaning, for instance. However, research remains at the laboratory scale due to a lack of understanding of the formation mechanism of porous BN, which is largely a “black box” and prevents scale up. Partial reaction pathways have been unveiled, but they omit critical steps in the formation, including the porosity development, which is key to adsorption. To unlock the potential of porous BN at a larger scale, we have investigated its formation from the perspective of both chemical formation and porosity development. We have characterized reaction intermediates obtained at different temperatures with a range of analytical and spectroscopic tools. Using these analyses, we propose a mechanism highlighting the key stages of BN formation, including intermediates and gaseous species formed in the process. We identified the crucial formation of nonporous carbon nitride to form porous BN with release of porogens, such as CO2. This work paves the way for the use of porous BN at an industrial level for gas and liquid separations.

Diamond Keywords: Gas Separation

Subject Areas: Chemistry, Materials

Instruments: B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS

Added On: 06/12/2021 08:49

Discipline Tags:

Physical Chemistry Chemistry Materials Science Inorganic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Near Edge X-ray Absorption Fine Structures (NEXAFS)