Journal
CARBON
Volume 47, Issue 8, Pages 2032-2039Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2009.03.050
Keywords
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Funding
- CNPq - Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Ministerio da Ciencia e Tecnologia (MCT), Brasil
- FCT (Portugal) [POCI/N001/2005]
- FEDER [POCI/EQU/57369/2004]
- Fundação para a Ciência e a Tecnologia [POCI/EQU/57369/2004] Funding Source: FCT
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Carbon xerogels were prepared from a nitrogen-containing polymer precursor, using melamine and urea as nitrogen sources incorporated into the polymer matrix using the sol-gel process. To investigate the effects of nitrogen on the texture, morphology and surface chemistry, the carbon xerogels were characterized by nitrogen adsorption, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and acid-base titrations. The results showed that nitrogen was incorporated onto the surface as pyridine, pyrrolic/pyridine, quaternary nitrogen, and pyridine-N-oxide. From the deconvolution of the XPS spectra, the pyrrolic/pyridine and quaternary nitrogen functionalities were found to dominate in the samples prepared from urea. All samples showed increased basicity after nitrogen incorporation. (C) 2009 Elsevier Ltd. All rights reserved.
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