期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 36, 页码 19456-19466出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta05523d
关键词
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资金
- Ohio Research Scholars Program Research Cluster on Surfaces in Advanced Materials
Nitrogen-doped microporous carbon spheres (CSs) were prepared via the St ober 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 degrees C and 1 bar pressure was achieved for the carbon sample, which possessed the highest ultramicropore volume of 0.42 cm(3) 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 degrees 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 degrees 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.
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