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Contribution (Poster/Keynote)
(Graphene 2012 Extended abstract format: 2 pages max including figures and references.
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Storing Hydrogen in Pd/Ni-Graphene and Graphene Oxide
M. Madian*, N. Ismail*, M. S. El-Shall**
*Center of Excellence for Advanced Science, NRC, Giza, Egypt.
** Virginia Commonwealth University, Chemistry dep., Richmond, Virginia, USA
[email protected]
The Graphene Oxide (GO) is prepared by Hummer method from graphite powder using different degree
of oxidation. The hydrogen storage of GO was studied in different temperatures up to 20 bar. The
results revealed that at 80 K GO is able to adsorb 0.5 wt% hydrogen. The intensive oxidation increased
the hydrogen capacity to 1.2 wt% due to increasing the degree of graphite exfoliation. Graphene is
doped with 5 wt% and 10 wt% of Pd/Ni for the purpose of testing its hydrogen storage capacity at 300K
and 80K from the gas phase. The Pd doped graphene showed improvement in the hydrogen storage
capacity by 1.6 fold at 300K and 1.4 fold at 80 K. Pd particles induce the atomization of the hydrogen
molecule on it which facilitate the C-H(atom) bonding. On the other hand, Ni has enhanced the
hydrogen storage capacity only at 80 K and showed a negative effect at 300K by reducing the storage
capacity. This might be due to the presence of Ni in the form of oxide and hydroxide.
References
[1] I. Lopez-Corral, E. German, M.A. Volpe, G.P. Brizuela and A. Juan, Tight-binding study of
hydrogen adsorption on palladium decorated graphene and carbon nanotubes, Int. J. of hydrogen
Energy, 35 (2010) 2377-84.
[2] Zhong-Liang Hu, Mami Aizawa, Zheng-Ming Wang, Noriko Yoshizawa, and Hiroaki Hatori,
Synthesis and Characteristics of Graphene Oxide-Derived Carbon Nanosheet-Pd Nanosized
Particle Composites Langmuir 2010, 26(9), 6681–6688.
Figures
Intensity,(a.u.)
G raphite
G raphene O xide
G raphene
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10
15
20
2θ
Figure (1)
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Contribution (Poster/Keynote)
a
b
Figure (2)
Figure caption
Figure 1: XRD diffraction pattern of Graphene stepwise preparation.
Figure 2: (a) SEM image as-prepared graphene, (b) TEM of graphene doped with 10 wt% Pd near sheet
edge.