73 research outputs found
Synthesis of titanium decorated graphene for renewable energy applications
Reduced graphene oxide (RGO) was prepared from natural graphite by Hummers method. Few layers graphene was decorated with titanium by an incipient wetness impregnation method. The pristine graphene shows hydrogen storage capacity equal to 1.3 wt % while graphene decorated by titanium (RGO-Ti) enhanced hydrogen storage capacity to 1.4 wt%. We showed that titanium addition improved hydrogen storage capacity by chemical interactions. These interactions can be used for
fabrication of different graphene-based materials as potential candidates for developing new absorbents for energy application
Prospects for hydrogen storage in graphene
Hydrogen-based fuel cells are promising solutions for the efficient and clean
delivery of electricity. Since hydrogen is an energy carrier, a key step for
the development of a reliable hydrogen-based technology requires solving the
issue of storage and transport of hydrogen. Several proposals based on the
design of advanced materials such as metal hydrides and carbon structures have
been made to overcome the limitations of the conventional solution of
compressing or liquefying hydrogen in tanks. Nevertheless none of these systems
are currently offering the required performances in terms of hydrogen storage
capacity and control of adsorption/desorption processes. Therefore the problem
of hydrogen storage remains so far unsolved and it continues to represent a
significant bottleneck to the advancement and proliferation of fuel cell and
hydrogen technologies. Recently, however, several studies on graphene, the
one-atom-thick membrane of carbon atoms packed in a honeycomb lattice, have
highlighted the potentialities of this material for hydrogen storage and raise
new hopes for the development of an efficient solid-state hydrogen storage
device. Here we review on-going efforts and studies on functionalized and
nanostructured graphene for hydrogen storage and suggest possible developments
for efficient storage/release of hydrogen at ambient conditions
Effect of Nitrogen Doping on Hydrogen Storage Capacity of Palladium Decorated Graphene
A high hydrogen storage capacity for palladium decorated
nitrogen-doped
hydrogen exfoliated graphene nanocomposite is demonstrated under moderate
temperature and pressure conditions. The nitrogen doping of hydrogen
exfoliated graphene is done by nitrogen plasma treatment, and palladium
nanoparticles are decorated over nitrogen-doped graphene by a modified
polyol reduction technique. An increase of 66% is achieved by nitrogen
doping in the hydrogen uptake capacity of hydrogen exfoliated graphene
at room temperature and 2 MPa pressure. A further enhancement by 124%
is attained in the hydrogen uptake capacity by palladium nanoparticle
(Pd NP) decoration over nitrogen-doped graphene. The high dispersion
of Pd NP over nitrogen-doped graphene sheets and strengthened interaction
between the nitrogen-doped graphene sheets and Pd NP catalyze the
dissociation of hydrogen molecules and subsequent migration of hydrogen
atoms on the doped graphene sheets. The results of a systematic study
on graphene, nitrogen-doped graphene, and palladium decorated nitrogen-doped
graphene nanocomposites are discussed. A nexus between the catalyst
support and catalyst particles is believed to yield the high hydrogen
uptake capacities obtained
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