Conjugated Microporous Polycarbazole Networks as Precursors for Nitrogen-Enriched Microporous Carbons for CO₂ Storage and Electrochemical Capacitors

The design and synthesis of novel microporous materials have received tremendous attention in both CO2 storage and sequestration (CSS) and electrochemical energy storage (EES). We report molecular design and synthesis of conjugated microporous polycarbazole networks as new precursors for nitrogen-enriched porous carbons. As-prepared porous carbons exhibit a high nitrogen content (6.1 wt %), ultramicropore size (0.7–1 nm), and large surface area (1280 m2 g–1). As a result, these novel nitrogen-enriched carbons show highly efficient and reversible CO2 capture (can store 20.4 wt % at 1 bar and 11.1 wt % at 0.15 bar and at 273 K, while maintaining 100% CO2 uptake capacity after five cycles). Moreover, they can be applied as electrodes and enable high-performance EES devices with a fast charge/discharge rate (8 s), high electrochemical capacity (558 F g–1), and good cycle ability (retain 95% capacity after 1000 cycles).