期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 10, 期 7, 页码 1496-1504出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201500185
关键词
carbon; carbon dioxide; high surface area; microflowers; microporous materials
资金
- National Natural Science Foundation of China [21471016, 21271023]
- 111 Project [B07012]
Sustainable carbon materials have received particular attention in CO2 capture and storage owing to their abundant pore structures and controllable pore parameters. Here, we report high-surface-area hierarchically porous N-doped carbon microflowers, which were assembled from porous nanosheets by a three-step route: soft-template-assisted self-assembly, thermal decomposition, and KOH activation. The hydrazine hydrate used in our experiment serves as not only a nitrogen source, but also a structure-directing agent. The activation process was carried out under low (KOH/carbon=2), mild (KOH/carbon=4) and severe (KOH/carbon=6) activation conditions. The mild activated N-doped carbon microflowers (A-NCF-4) have a hierarchically porous structure, high specific surface area (2309m(2)g(-1)), desirable micropore size below 1nm, and importantly large micropore volume (0.95cm(3)g(-1)). The remarkably high CO2 adsorption capacities of 6.52 and 19.32mmolg(-1) were achieved with this sample at 0 degrees C (273K) and two pressures, 1bar and 20bar, respectively. Furthermore, this sample also exhibits excellent stability during cyclic operations and good separation selectivity for CO2 over N-2.
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