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Nanoscale cobalt doped carbon aerogel: microstructure and isosteric heat of hydrogen adsorption

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Authors
Tian, Hu-Yong
Buckley, Craig
Paskevicius, Mark
Sheppard, Drew
Wang, Shaobin
Webb, C.
Gray, E.
Date
2011
Type
Journal Article

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Tian, H. Y. and Buckley, C. E. and Paskevicius, M. and Sheppard, D. A. and Wang, S. B. and Webb, C. J. and Gray, E. M. 2011. Nanoscale cobalt doped carbon aerogel: microstructure and isosteric heat of hydrogen adsorption. International Journal of Hydrogen Energy. 36 (17): pp. 10855-10860.
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International Journal of Hydrogen Energy
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Department of Imaging and Applied Physics
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Abstract

The incorporation of nanoscale Co particles (with sizes from a few nanometres) into porous carbon aerogels (CAs) was investigated. Elemental maps of the nanoscale metal particles embedded within CA were obtained using energy filtered transmission electron microscopy. The microstructure of Co doped carbon aerogels was further investigated using small angle X-ray scattering and nitrogen adsorption at 77 K. The isosteric heat of adsorption (Qst) was investigated as a function of hydrogen uptake at temperatures from 77 K to 110 K over the pressure range of 0–0.25 MPa. The isosteric heat of adsorption at low H2 concentration for Co doped CA (9.0 kJ mol−1) was found to be higher than for pure CA (5.8 kJ mol−1).