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[CTF-TCB] Rapid, Ordered Polymerization of Crystalline SemiconductingCovalent Triazine Frameworks
Summary:
The authors from Westlake University developed a series of highly crystalline and semiconducting covalent triazine frameworks (CTFs) using a rapid microwave-assisted synthetic strategy, achieving significant results in photocatalysis and energy storage applications.
Background:
1. To address the problem of poor crystallinity and high reaction temperatures in traditional synthesis methods of CTFs, previous researchers conducted work, achieving success in preparing crystalline CTFs but facing issues such as partial carbonization and limited scalability.
2. The authors in this study proposed an innovative microwave-assisted rapid synthesis method and obtained highly crystalline CTFs with high surface areas and tunable properties.
Research Content:
1. Synthesis:
The authors synthesized the CTFs using a microwave-assisted rapid synthesis method with trifluoromethanesulfonic acid (CF3SO3H) as a catalyst under solvent-free conditions.
2. Characterizations:
1) BET surface area measurements showed high surface areas of 282 m²/g for CTF-TCB, 672 m²/g for CTF-DCB, and 536 m²/g for CTF-DCBP. Pore size distribution indicated micropores around 0.67 nm, 1.1 nm, and 2.0 nm respectively.
2) SEM/TEM tests showed that the materials had layered structures with particle sizes in the micron range.
3) Other electrochemical and optical tests revealed that the CTFs had tunable band gaps and efficient photocatalytic hydrogen evolution rates.
3. Application:
The CTFs were tested in photocatalytic hydrogen evolution, with CTF-DCB achieving a rate of 7971 mmolg-1h-1 after ball-milling exfoliation into 2D nanosheets.
4. Mechanism:
The rapid polymerization mechanism involved monomers rapidly forming periodic 2D molecular sheets within 10 seconds, followed by growth into more ordered frameworks. The crystalline structure facilitated charge separation and improved photocatalytic performance.
Outlook:
This research provides a novel and efficient method for the synthesis of crystalline CTFs with high surface areas and tunable properties, significantly enhancing their potential applications in photocatalysis and energy storage.
Rapid, Ordered Polymerization of Crystalline Semiconducting Covalent Triazine Frameworks
Authors: Tian Sun, Yan Liang, Yuxi Xu
DOI: 10.1002/anie.202113926
Link: https://onlinelibrary.wiley.com/doi/10.1002/anie.202113926
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