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Synthesis of High‐Surface‐Area Nitrogen‐Doped Porous Carbon Microflowers and Their Efficient Carbon Dioxide Capture Performance
Author(s) -
Li Yao,
Cao Minhua
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500185
Subject(s) - microporous material , materials science , chemical engineering , carbon fibers , specific surface area , adsorption , carbide derived carbon , nitrogen , porosity , hydrate , hydrazine (antidepressant) , carbon dioxide , nanotechnology , activated carbon , carbon nanofiber , organic chemistry , chemistry , composite material , carbon nanotube , catalysis , chromatography , composite number , engineering
Sustainable carbon materials have received particular attention in CO 2 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 (2309 m 2 g −1 ), desirable micropore size below 1 nm, and importantly large micropore volume (0.95 cm 3 g −1 ). The remarkably high CO 2 adsorption capacities of 6.52 and 19.32 mmol g −1 were achieved with this sample at 0 °C (273 K) and two pressures, 1 bar and 20 bar, respectively. Furthermore, this sample also exhibits excellent stability during cyclic operations and good separation selectivity for CO 2 over N 2 .