In:
Angewandte Chemie, Wiley, Vol. 133, No. 49 ( 2021-12), p. 25892-25898
Abstract:
Perfluorinated covalent triazine frameworks (F‐CTFs) have shown unique features and attractive performance in separation and catalysis. However, state‐of‐the‐art F‐CTFs synthesized via the ZnCl 2 ‐promoted procedure have quite low fluorine contents due to C−F bond cleavage induced by chloride (a Lewis base) and the harsh conditions deployed (400–700 °C). Fabricating F‐CTFs with high fluorine contents ( 〉 30 wt %) remains challenging. Herein, we present a low‐temperature ionothermal approach (275 °C) to prepare F‐CTFs, which is achieved via polymerization of tetrafluoroterephthalonitrile (TFPN) over the Lewis superacids, e.g., zinc triflimide [Zn(NTf 2 ) 2 ] without side reactions. With low catalyst loading (equimolar), F‐CTFs are afforded with high fluorine content (31 wt %), surface area up to 367 m 2 g −1 , and micropores around 1.1 nm. The highly hydrophobic F‐CTF‐1 exhibits good capability to boost electroreduction of CO 2 to CO, with faradaic efficiency of 95.7 % at −0.8 V and high current density (−141 mA cm −2 ) surpassing most of the metal‐free electrocatalysts.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v133.49
DOI:
10.1002/ange.202109342
Language:
English
Publisher:
Wiley
Publication Date:
2021
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