Mechanochemistry-driven phase transformation of crystalline covalent triazine frameworks assisted by alkaline molten salts

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 1; no. 27; pp. 1431 - 14315
• Main Authors: Fan, Juntian, Suo, Xian, Wang, Tao, Wang, Zongyu, Do-Thanh, Chi-Linh, Mahurin, Shannon M, Kobayashi, Takeshi, Yang, Zhenzhen, Dai, Sheng
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 12.07.2022; Royal Society of Chemistry (RSC)
• Subjects: carbonization; Catalysis; catalytic activity; Crystal structure; Crystallinity; energy; Energy storage; mechanochemistry; Molten salts; nanopores; phase transition; Phase transitions; Porosity; Salts; surface area; Triazine; triazines
• ISSN: 2050-7488; 2050-7496; 2050-7496
• DOI: 10.1039/d2ta02117j

Covalent triazine frameworks (CTFs) have shown wide applications in the fields of separation, catalysis, energy storage, and beyond. However, it is a long-term challenging subject to fabricate high-quality CTF materials via facile procedures. Herein, a mechanochemistry-driven procedure was developed to achieve phase transformation of crystalline CTFs assisted by alkaline molten salts. The transformation of CTF-1 from staggered AB to eclipsed AA stacking mode was achieved by short time (30 min) mechanochemical treatment in the presence of molten salts composed of LiOH/KOH, generating high-quality CTF-1 material with high crystallinity, high surface area (625 m 2 g −1 ), and permanent/ordered porosity without carbonization under ambient conditions. This facile procedure could be extended to provide nanoporous three-dimensional CTF materials. A mechanochemistry-driven procedure was developed to achieve phase transformation of crystalline covalent triazine frameworks (CTFs) assisted by alkaline molten salts, generating high-quality CTF-1 material under ambient conditions.