Speaker
Description
Due to its unique structure and chemical properties, the synthesis of porous turbostratic boron nitride (t-BN) has received great attention during the last years. t-BN is particularly characterized by its strong adsorption affinity to oils, drugs, or exhaust gases [1] and its high thermal stability up to 900 °C. The material can hence be used for gas storage or as high-temperature catalyst support.
One of the current challenges using highly porous t-BN is its rapid decomposition in presence of water due to the low crystallinity of the material [2]. The aim of this study is therefore to synthesize porous t-BN with high crystallinity and to investigate the influence on porosity and stability.
Synthesis of mesoporous boron nitride
Using a template-free synthesis approach, a boron and a nitrogen source (i.e. boric acid and urea) are homogeneously mixed. The resulting precursor mixture is then pyrolyzed under a protective nitrogen flow. In the end, a mesoporous t-BN with enhanced water stability can be received. The crystallinity of the material can be controlled by changing the synthesis temperature, nitrogen flow rate, and synthesis time.
The crystallinity, porosity, and stability of the obtained materials are characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen sorption, mercury intrusion, and water adsorption.
References
[1] J. Xiong, J. Di, W. Zhu, H. Li, Journal of Energy Chemistry 40 (2020) 99.
[2] R. Shankar, S. Marchesini, C. Petit, Journal of Physical Chemistry C 123 (2019) 4282.
| Speaker Country | Deutschland |
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