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[CTF-1] Crystallization of Covalent Triazine Frameworks
Summary:
The authors from Huazhong University of Science and Technology developed crystalline covalent triazine frameworks (CTFs) using a heterogeneous nucleation approach, achieving high photocatalytic hydrogen evolution from sea water.
Background:
1. To address the problem of limited structural diversity and low crystallinity of traditional CTFs, previous researchers conducted work, achieving success in synthesizing CTFs through homogeneous nucleation, yet there are problems with narrow monomer scope and low crystallinity.
2. The authors in this work proposed an innovative heterogeneous nucleation strategy using inorganic salt as a nucleation agent and obtained crystalline CTFs with high degrees of crystallinity and nanosheet morphologies.
Research Content:
1. Synthesis:
The authors synthesized the crystalline CTFs using a heterogeneous nucleation approach with inorganic salt as the nucleation agent.
2. Characterizations:
1) Results of BET show surface areas of 618-800 m²g⁻¹, and pore size distribution reveals pore sizes in the range of 1.2-1.8 nm.
2) SEM/TEM tests show the particle size of the material with nanosheet morphologies.
3) Other electrochemical or optical tests reveal strong light absorption in the visible region and suitable energy levels for photocatalytic hydrogen evolution.
3. Application:
The material was tested in photocatalytic hydrogen evolution from sea water, achieving a hydrogen evolution rate of 791 μmol h⁻¹ and an apparent quantum yield of 12.8% under 420 nm irradiation.
4. Mechanism:
The analysis of the experiment results indicates that the crystalline structure and nanosheet morphology of the CTFs facilitate efficient charge separation and transfer. The heterogeneous nucleation approach promotes the formation of well-defined triazine units and reduces defects, enhancing photocatalytic performance.
Outlook:
This research successfully demonstrates a new approach to synthesize crystalline CTFs with wide monomer scope and high crystallinity, significantly enhancing photocatalytic hydrogen evolution performance. It opens up a promising avenue for combining crystallinity and chemical diversity in CTFs for improved functional properties.
Crystallization of Covalent Triazine Frameworks via a Heterogeneous Nucleation Approach for Efficient Photocatalytic Applications
Authors: Liping Guo, Xuepeng Wang, Zhen Zhan, Yueli Zhao, Linjiang Chen, Tao Liu, Bien Tan, Shangbin Jin
DOI: 10.1021/acs.chemmater.0c03716
Link: https://pubs.acs.org/doi/10.1021/acs.chemmater.0c03716
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