A highly proton conductive perfluorinated covalent triazine framework via low-temperature synthesis

Lijiang Guan, Zhaoqi Guo, Qi Zhou, Jin Zhang, Cheng Cheng, Shengyao Wang, Xiang Zhu, Sheng Dai and Shangbin Jin ()
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Lijiang Guan: Xi’an Jiaotong University
Zhaoqi Guo: Northwest University
Qi Zhou: Xi’an Jiaotong University
Jin Zhang: Xi’an Jiaotong University
Cheng Cheng: Xi’an Jiaotong University
Shengyao Wang: Huazhong Agricultural University
Xiang Zhu: Chinese Academy of Sciences
Sheng Dai: Oak Ridge National Laboratory
Shangbin Jin: Xi’an Jiaotong University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Proton-conducting materials are essential to the emerging hydrogen economy. Covalent triazine frameworks (CTFs) are promising proton-conducting materials at high temperatures but need more effective sites to strengthen interaction for proton carriers. However, their construction and design in a concise condition are still challenges. Herein, we show a low temperature approach to synthesize CTFs via a direct cyclotrimerization of aromatic aldehyde using ammonium iodide as facile nitrogen source. Among the CTFs, the perfluorinated CTF (CTF-TF) was successfully synthesized with much lower temperature ( ≤ 160 °C) and open-air atmosphere. Due to the additional hydrogen-bonding interaction between fluorine atoms and proton carriers (H3PO4), the CTF-TF achieves a proton conductivity of 1.82 × 10−1 S cm−1 at 150 °C after H3PO4 loading. Moreover, the CTF-TF can be readily integrated into mixed matrix membranes, displaying high proton conduction abilities and good mechanical strength. This work provides an alternative strategy for rational design of proton conducting media.

Date: 2023
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DOI: 10.1038/s41467-023-43829-4

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