Biomedical Engineering Reference
In-Depth Information
density can be estimated, with an accuracy of the order of magnitude.
It can be also argued [3] that the observed multilayer intercalation
(Fig. 2.20) was induced by the monolayer chemisorption of III and II
types (Table 2.1).
As a matter of fact, the experimental data [38] are in principle
adequate, according to the multilayer intercalation phenomenon,
to explain the super-adsorption sensational data obtained for GNFs
(about 40 wt% charging the H
gas at 300 K and 11 MPa [39]. This,
according to the analysis reported in Ref. [3]) can be attributed to
the multilayer intercalation of hydrogen between graphene sheets
of GNFs, induced by the monolayer chemisorption of III and II
types (Fig. 2.6). Comparing Fig. 2.6 to Fig. 2.1 in Ref. [40] and using
the analytical results [3, 4], one can explain the absence of such
phenomenon both for GNFs [40] and for a number of other related
experiments.
2
2.3.5
Conclusion
1. There are some experimental proofs (considered in Section
1.2 and 1.3) of the occurrence of hydrogen multilayer interca-
lation (a condensation or a clustering type physisorption) in
carbonaceous nanostructures, initiated by (and/or accompa-
nied with) chemisorption.
2. Hence, one can conclude that there is a real opportunity
to develop carbonaceous super-adsorbents materials for
hydrogen storage [3] (in Section 1.3) in view of vehicular and
other applications.
3. Further studies of the hydrogen multilayer intercalation with
carbonaceous nanostructures can allow to solve the problem
of the on-board hydrogen storage for the fuel-cell-powered
vehicles, and in particular, to match the DOE requirements
respect to the gravimetric and volumetric capacities.
References
1. Satyapal S., Petrovic J., Read C., Thomas G., and Ordaz G. (2007).
Catal.
Today
,
120
, 246.
2.
Committee on Alternatives and Strategies for Future Hydrogen
Production and Use, Hydrogen Economy: Opportunities, Costs, Barriers,
and R&D Needs
(2004). National Academy Press, Washington.
