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[CTF-HUST] Covalent Triazine Frameworks via a Low-TemperaturePolycondensation Approach
Summary:
The authors from Huazhong University of Science and Technology developed a series of covalent triazine frameworks (CTFs) with layered structures via a low-temperature polycondensation approach, achieving significant results in the fields of gas adsorption, photocatalysis, and energy storage.
Background:
1. To address the problem of harsh synthetic conditions and limited structural diversity in traditional ionothermal synthesis of CTFs, previous researchers conducted work, achieving success in synthesizing CTFs with a degree of crystalline order, yet there are problems such as partial carbonization and limited scope for scale-up and synthetic diversity.
2. The authors in this study proposed an innovative polycondensation method involving the condensation reaction of aldehydes and amidines under mild conditions and obtained CTFs with layered structures and tunable functions.
Research Content:
1. Synthesis:
The authors synthesized the CTFs (CTF-HUSTs) using a polycondensation approach involving aldehydes and amidines under mild conditions (120°C, no strong acids).
2. Characterizations:
1) Results of BET show that the surface areas of CTF-HUSTs range from 663 to 807 m²/g, and pore size distribution indicates micropores around 12 Å.
2) SEM/TEM tests show the particle size of the material is in the micron range, with layered structures observed in HR-TEM and AFM.
3) Other electrochemical or optical tests reveal that CTF-HUSTs have tunable band gaps (2.13-2.42 eV) and high photocatalytic hydrogen evolution rates.
3. Application:
The CTFs were tested in gas adsorption, showing high CO2 and H2 uptake. In photocatalysis, CTF-HUST-2 achieved a hydrogen evolution rate of 2647 mmolh@1g@1 under visible light. After pyrolysis, p-CTF-HUST-4 was tested as an anode material for sodium-ion batteries, achieving a discharge capacity of 467 mAhg@1.
4. Mechanism:
The layered structures of CTFs facilitate charge separation and transport, enhancing photocatalytic performance. The tunable band gaps and microporous structures contribute to their high gas adsorption capacities. The interlayer distances in pyrolyzed CTFs facilitate sodium-ion transportation, improving battery performance.
Outlook:
This research provides a novel strategy for the design and synthesis of CTF materials under mild conditions, expanding their potential applications in energy storage, photocatalysis, and gas adsorption. The findings are significant for the development of new functional materials.
Covalent Triazine Frameworks via a Low-Temperature Polycondensation Approach
Authors: Kewei Wang, Li-Ming Yang, Xi Wang, Liping Guo, Guang Cheng, Chun Zhang, Shangbin Jin, Bien Tan, Andrew Cooper
DOI: 10.1002/anie.201708548
Link: https://onlinelibrary.wiley.com/doi/10.1002/anie.201708548
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