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

Guan, Lijiang; Guo, Zhaoqi; Zhou, Qi; Zhang, Jin; Cheng, Cheng; Wang, Shengyao; Zhu, Xiang; Dai, Sheng; Jin, Shangbin

doi:10.1038/s41467-023-43829-4

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

Journal Article · 08 December 2023 · Nature Communications

DOI: https://doi.org/10.1038/s41467-023-43829-4 · OSTI ID:2471476

Guan, Lijiang ^[1]; Guo, Zhaoqi ^[2]; Zhou, Qi ^[1]; Zhang, Jin ^[1]; Cheng, Cheng ^[1];

^[3]; Zhu, Xiang ^[4];

^[5];

^[1]

Xi’an Jiaotong University, Shaanxi (China)
Northwest University, Xi’an, Shaanxi (China)
Huazhong Agricultural University, Wuhan (China)
Chinese Academy of Sciences, Lanzhou (China)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Key Project of Natural Science Basic Research Program of Shaanxi; National Natural Science Foundation of China; Qin Chuangyuan cited high level innovation and entrepreneurship talent project; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2471476

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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