Jähnichen Tim, Hojak Jan, Bläker Christian, Pasel Christoph, Mauer Volker, Zittel Valeria, Denecke Reinhard, Bathen Dieter, Enke Dirk
Institute of Chemical Technology, Leipzig University, Linnéstr. 3, Leipzig 04103, Germany.
Chair of Thermal Process Engineering, University of Duisburg-Essen, Lotharstr. 1, Duisburg 47057, Germany.
ACS Omega. 2022 Sep 8;7(37):33375-33384. doi: 10.1021/acsomega.2c04003. eCollection 2022 Sep 20.
Since the recent discovery of the template-free synthesis of porous boron nitride, research on the synthesis and application of the material has steadily increased. Nevertheless, the formation mechanism of boron nitride is not yet fully understood. Especially for the complex precursor decomposition of urea-based turbostratic boron nitride (t-BN), a profound understanding is still lacking. Therefore, in this publication, we investigate the influence of different common pre-heating temperatures of 100, 200, 300, and 400 °C on the subsequent properties of t-BN. We show that the structure and porosity of t-BN can be changed by preheating, where a predominantly mesoporous material can be obtained. Within these investigations, the sample BN-300/2 depicts the highest mesopore surface area of 242 m g with a low amount of micropores compared to other BNs. By thermal gravimetric analysis, X-ray photoelectron spectroscopy, and Raman spectroscopy, valid details about the formation of intermediates, types of chemical bonds, and the generation of t-BN are delivered. Hence, we conclude that the formation of a mesoporous material arises due to a more complete decomposition of the urea precursor by pre-heating.
自从最近发现无模板合成多孔氮化硼以来，对该材料的合成与应用研究稳步增加。然而，氮化硼的形成机制尚未完全明晰。特别是对于基于尿素的乱层氮化硼（t-BN）复杂的前驱体分解过程，仍缺乏深入了解。因此，在本出版物中，我们研究了100、200、300和400°C不同常见预热温度对t-BN后续性能的影响。我们表明，通过预热可以改变t-BN的结构和孔隙率，从而可获得以介孔为主的材料。在这些研究中，样品BN-300/2的介孔表面积最高，为242 m²/g，与其他BN相比，微孔数量较少。通过热重分析、X射线光电子能谱和拉曼光谱，提供了有关中间体形成、化学键类型以及t-BN生成的有效细节。因此，我们得出结论，介孔材料的形成是由于预热使尿素前驱体分解更完全所致。
