Targeted control over the porosities and functionalities of conjugated microporous polycarbazole networks for CO2-selective capture and H2 storage

Abstract

We report a conjugated microporous polycarbazole network and its pyridine-, bipyridine-, and cyano-functionalized networks exhibiting large surface area (1126 m² g⁻¹), isosteric heat of CO₂ adsorption (∼32 kJ mol⁻¹), and CO₂-uptake capacity (14 wt% at 1 bar and 273 K). IAST calculations using single-component-isotherms reveal that the functionalized polycarbazole networks have a very high CO₂ selectivity over N₂ (164) under ambient conditions. These porous networks also possess moderate H₂ storage capacity (1.35 wt% at 1 bar and 77 K) and high isosteric heat of H₂ adsorption (10.3 kJ mol⁻¹). Our finding provides a new targeted route to control the porosities and functionalities of microporous polymers for efficient gas uptake.