Dual optimization of microporosity in carbon spheres for CO2 adsorption by using pyrrole as the carbon precursor and potassium salt as the activator
| Autor: | Mietek Jaroniec, Arosha C. Dassanayake |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
chemistry.chemical_classification Materials science Renewable Energy Sustainability and the Environment Carbonization Potassium Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Polymer Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology Polypyrrole 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Activator (phosphor) General Materials Science 0210 nano-technology Pyrrole |
| Zdroj: | Journal of Materials Chemistry A. 5:19456-19466 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta05523d |
| Popis: | Nitrogen-doped microporous carbon spheres (CSs) were prepared via the Stober method by simultaneous carbonization and activation of nitrogen-doped polymer spheres obtained in the presence of potassium citrate. Both additional microporosity and nitrogen doping in CSs were achieved by using pyrrole as one of the carbon precursors. A very high CO2 uptake of 7.35 mmol g−1 at 0 °C and 1 bar pressure was achieved for the carbon sample, which possessed the highest ultramicropore volume of 0.42 cm3 g−1 among all samples studied. Potassium citrate was shown to be an efficient in situ activator, which generated a high volume of ultramicropores below 0.8 nm at a temperature as low as 700 °C, while the use of polypyrrole led to an additional ultramicroporosity in CSs. Microporosity was simply tuned in CSs by varying the potassium salt content in the synthesis mixture. The resulting CSs possessed narrow pore size distributions with a large fraction of micropores below 1 nm and exhibited high CO2 uptakes ranging from 3.30 mmol g−1 to 7.35 mmol g−1 at 0 °C and 1 bar pressure, indicating the potential applicability of these carbons not only as CO2 sorbents but also in other applications such as energy storage in supercapacitors. |
| Databáze: | OpenAIRE |
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