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MonolithicBN_ChemRXiv_Final.pdf (1.75 MB)

Mechanically Stable Monolithic Porous Boron Nitride with High Volumetric Adsorption Capacity

submitted on 03.03.2021, 21:23 and posted on 05.03.2021, 06:57 by Tian Tian, Jingwei Hou, Humera Ansari, Ying Xiong, Anouk L'Hermitte, David Danaci, Ronny Pini, Camille Petit

The development of adsorbents into structured and robust forms remains a challenge for emerging porous materials. In the context of porous boron nitride (BN), studies point to a tradeoff between mechanical stability, porosity, density, and adsorption kinetics. Approaches towards shaping and densification of porous BN have been mostly empirical since a detailed understanding of its formation mechanism, and how it impacts mechanical strength and porosity, is lacking. Here, we demonstrate a synthesis method that can directly produce a mechanically robust monolithic porous BN (mpBN) from an easily scalable polymeric precursor, which results in the highest volumetric surface area among porous BN samples to date. mpBN exhibits a high bulk density, 50% higher than BN powders and over ten times higher than the structured BN aerogels, while maintaining fast sorption kinetics. mpBN presents good mechanical strength, with hardness of 66.4 ± 4.5 MPa, i.e. one to two orders of magnitude higher than structured aerogels. We propose a mpBN formation mechanism which reveals that the crosslinked intermediates are responsible for the high mechanical strength of the final material. Our approach produces a form of BN that addresses the limitations of other adsorbents, and facilitate their application in gas separation and storage technologies.


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Imperial College London


United Kingdom

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Declaration of Conflict of Interest

The authors declare no conflict of interest.