Direct Synthesis of Microporous Bicarbazole‐Based Covalent Triazine Frameworks for High‐Performance Energy Storage and Carbon Dioxide Uptake

In this study a series of bicarbazole‐based covalent triazine frameworks (Car‐CTFs) were synthesized under ionothermal conditions from [9,9'‐bicarbazole]‐3,3',6,6'‐tetracarbonitrile (Car‐4CN) in the presence of molten zinc chloride. Thermogravimetric and Brunauer−Emmett−Teller analyses revealed that these Car‐CTFs possessed excellent thermal stabilities and high specific surface areas (ca. 1400 m2/g). The electrochemical performances of this Car‐CTF series, investigated by using cyclic voltammetry, showed a highest capacitance of (545 F/g at 5 mV/s), which also exhibited excellent columbic efficiencies of 96.1 % after 8000 cycles at 100 μA/0.5 cm2. The other Car‐CTF samples displayed similar efficiencies. Furthermore, based on CO2 uptake measurements, one of the series showed the highest CO2 uptake capacities: 3.91 and 7.60 mmol/g at 298 and 273 K, respectively. These results suggest a simple method for the preparation of CTF materials that provide excellent electrochemical and CO2 uptake performance. Carbazole captures: A series of bicarbazole‐based covalent triazine frameworks (Car‐CTFs) were synthesized under ionothermal conditions from Car‐4CN in the presence of molten zinc chloride. Thermogravimetric and Brunauer−Emmett−Teller analyses revealed that these Car‐CTFs possess excellent thermal stabilities and high specific surface areas (ca. 1400 m2/g). One sample showed excellent electrochemical performance of 545 F/g at 5 mV/s and highest CO2 uptake capacities of 3.91 and 7.60 mmol/g at 298 and 273 K, respectively.Microporous bicarbazole‐based covalent triazine frameworks for high‐performance energy storage and carbon dioxide uptake (Kuo et al.)