Abstract
Porous graphitic carbons were obtained from wood precursors using Ni as a graphitization catalyst during pyrolysis. The structure of the resulting material retains that of the original wood precursors with highly aligned, hierarchical porosity. Thermal characterization was performed by means of thermogravimetry and differential scanning calorimetry, and the onset temperature for graphitization was determined to be ~900 °C. Structural and microstructural characterization was performed by means of electron microscopy, electron and x-ray diffraction, and Raman spectroscopy. The effect of maximum pyrolysis temperature on the degree of graphitization was assessed. No significant temperature effect was detected by means of Raman scattering in the range of 1000–1400 °C, but at temperatures over the melting point of the catalyst, the formation of graphite grains with long-range order was detected.
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Acknowledgements
This work was supported by the Junta de Andalucía under grant No. P09-TEP-5152. Electron microscopy and x-ray diffraction measurements were performed at the CITIUS central services of the University of Seville. Raman scattering measurements were performed at the ICMS. A. Gutiérrez-Pardo is grateful to the Junta de Andalucía for a predoctoral grant.
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Gutiérrez-Pardo, A., Ramírez-Rico, J., de Arellano-López, A.R. et al. Characterization of porous graphitic monoliths from pyrolyzed wood. J Mater Sci 49, 7688–7696 (2014). https://doi.org/10.1007/s10853-014-8477-8
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DOI: https://doi.org/10.1007/s10853-014-8477-8