Chemical state of nitrogen in carbon aerogels issued from phenol–melamine–formaldehyde gels

Chemical states of nitrogen in the carbon aerogels synthesized from phenol-melamine-formaldehyde were investigated by elemental analysis, X-ray photoelectron spectroscopy and nitrogen adsorption. It is found that the carbon aerogels are rich in mesopores and the nitrogen content of the carbon aeroge...

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Bibliographic Details
Published in:Carbon (New York) 2008-08, Vol.46 (9), p.1259-1262
Main Authors: Long, Donghui, Zhang, Jie, Yang, Junhe, Hu, Zijun, Cheng, Guo, Liu, Ximiao, Zhang, Rui, Zhan, Liang, Qiao, Wenming, Ling, Licheng
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Materials science
Physics
Porous materials
Specific materials
Surface physical chemistry
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Summary:Chemical states of nitrogen in the carbon aerogels synthesized from phenol-melamine-formaldehyde were investigated by elemental analysis, X-ray photoelectron spectroscopy and nitrogen adsorption. It is found that the carbon aerogels are rich in mesopores and the nitrogen content of the carbon aerogels increases from 1.6 to 3.1 wt. % with increasing melamine to phenol ratios. Over two-thirds of nitrogen are on periphery of graphene layers (pyridinic-N, pyrrolic-N and/or pyridonic-N, pyridine N-oxide) and less than one-third in central position of graphene layers (quaternary-N). Polymerisation at low pH might cause a preferred location of nitrogen on periphery of graphene layer.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2008.04.022