article · ACS Applied Materials & Interfaces
Nitrogen-doped microporous carbon materials offer high potential for capturing carbon dioxide and storing electrical energy in supercapacitors. Researchers synthesised a porous organic polymer named Cr-TPA-4BZ-Py-POP by linking a brominated benzoxazine monomer with tetraethynylpyrene using a Sonogashira coupling reaction. The precursor monomer was produced through a three-step chemical process comprising imine formation, borohydride reduction, and Mannich condensation. Subsequent carbonisation and potassium hydroxide activation produced a graphite-like microporous carbon designated as poly(Cr-TPA-4BZ-Py-POP)-800. Testing demonstrated that this carbon material achieves a carbon dioxide uptake capacity of 4.4 millimoles per gram. In energy storage tests, it delivered specific capacitances of 397.2 farads per gram in a three-electrode setup at 0.5 amperes per gram and 159.2 farads per gram in a symmetric coin cell at 1 ampere per gram. These dual performance features arise from an optimal ratio of heteroatom doping within the carbon framework.
Developing materials that can both capture carbon emissions and store electrical charge addresses pressing environmental and energy storage demands. By converting synthetic porous polymers into nitrogen-doped microporous carbons, this process creates robust materials with high gas-uptake efficiency and reliable electrochemical capacitance, supporting cleaner industrial emissions management and the development of high-performance energy storage devices.
This material could enable applications in industrial carbon dioxide capture systems and supercapacitor energy storage devices. Potential end users include manufacturers of gas-separation equipment and energy storage technologies. The technology appears to be at an early laboratory stage, having been evaluated in standard three-electrode cells and laboratory coin cells rather than full commercial modules or operational industrial environments.
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Nitrogen-doped carbon materials, characterized by abundant microporous and nitrogen functionalities, exhibit significant potential for carbon dioxide capture and supercapacitors. In this study, a class of porous organic polymer (POP) were successfully synthesized by linking Cr-TPA-4BZ-Br<sub>4</sub> and tetraethynylpyrene (Py-T). The model benzoxazine monomers of Cr-TPA-4BZ and Cr-TPA-4BZ-Br<sub>4</sub> were synthesized using the traditional three-step method [involving CH═N formation, reduction by NaBH<sub>4</sub>, and Mannich condensation]. Subsequently, the Sonogashira coupling reaction connected the Cr-TPA-4BZ-Br<sub>4</sub> and Py-T monomers, forming Cr-TPA-4BZ-Py-POP. The successful synthesis of Cr-TPA-4BZ-Br<sub>4</sub> and Cr-TPA-4BZ-Py-POP was confirmed through various analytical techniques. After verifying the successful synthesis of Cr-TPA-4BZ-Py-POP, carbonization and KOH activation procedures were conducted. These crucial steps led to the formation of poly(Cr-TPA-4BZ-Py-POP)-800, a carbon material with a structure akin to graphite. In practical applications, poly(Cr-TPA-4BZ-Py-POP)-800 exhibited a noteworthy CO<sub>2</sub> adsorption capacity of 4.4 mmol/g, along with specific capacitance values of 397.2 and 159.2 F g<sup>-1</sup> at 0.5 A g<sup>-1</sup> (measured in a three-electrode cell) and 1 A g<sup>-1</sup> (measured in a symmetric coin cell), respectively. These exceptional dual capabilities stem from the optimal ratio of heteroatom doping. The outstanding performance of poly(Cr-TPA-4BZ-Py-POP)-800 microporous carbon holds significant promise for addressing contemporary energy and environmental challenges, making substantial contributions to both sectors.
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DOI: 10.1021/acsami.4c05645
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