Journal
MATERIALS LETTERS
Volume 65, Issue 7, Pages 1069-1072Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2011.01.003
Keywords
Carbon microspheres; Urea formaldehyde resin; Nitrogen functionalities; Electron microscopy; X-ray techniques
Funding
- Natural Science Foundation of Tianjin City [08JCZDJC17000, 09ZCKFGX02400]
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Carbon microspheres were synthesized through polymerization of urea/formaldehyde in the presence of formic acid as catalyst, followed by drying and carbonization in an inert atmosphere. The samples were characterized by SEM, XRD. HRTEM, elemental analysis and XPS. The obtained carbon microspheres were amorphous indicated by the results of XRD and HRTEM. The changes of nitrogen functionalities at 400-1000 degrees C were determined by XI'S. The fraction of pyridine nitrogen and pyrrole/pyridone nitrogen decreased with increasing temperature, whereas the amount of quaternary nitrogen increased. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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