Efficient proton conduction of a triazole-linked covalent organic framework via ionic liquidization

Herein, a series of triazole ionic liquids with Br & oslash;nsted acids and sulfonate groups have been introduced into a triazole-linked covalent organic framework (TpTDA) via an ionic-liquidized strategy for proton conduction. Firstly, the covalent organic framework (TpTDA) bonded with ethidium bromide and 1, 3-propanesultone via the reactions of triazole groups in COFs, then the Br & oslash;nsted acids have been embedded into TpTDA pores (TpTDA-BS:X, X = CF3SO3-, HSO4- and H2PO4-) via ion-exchange reactions. The structures of composites have been characterized by different techniques. The as-prepared TpTDA-BS:X (X = CF3SO3-, HSO4- and H2PO4-) exhibited proton conductivity of 4.18 x 10(-3), 4.98 x 10(-4), and 2.84 x 10(-4) S cm(-1) at 323 K and similar to 98 % relative humidity (RH). Further, the composites were implanted into poly (vinyl alcohol poly/2-acrylamido-2-methyl-1-propanesulfonic acid) (PVA/PAMPS) to form hybrid membranes. The conductivity of 15 wt% TpTDA-BS:CF(3)SO(3)(-)filled PVA/PAMPS has been achieved up to 1.26 x 10(-2) S cm(-1) under 323 K and similar to 58 % RH, realizing a better conduction, two orders of magnitude higher than those of the parent TpTDA. Additionally, the TpTDA-BS:CF3SO3--filled hybrid membrane has been employed as impedance sensor to formic acid. This study contributes to driving advances of ionic-liquidized COFs in related electrochemical devices.