charge/discharge and electrochemical impedance
spectroscopy (EIS). The Cyclic life performance (CP) was measured and compared.
oxide Nano sheets synthesized by Hummer’s method. As prepared GO Nano sheets
coated on a copper foil by electrodeposition route. The samples were
characterized by field emission scanning electron microscopy (FESEM), Raman
spectroscopy and X-ray diffraction (XRD). Electrochemical properties of the
electrodes were studied by cyclic voltammetry (CV), galvanostatic
In this investigation we study
electrochemical hydrogen storage properties of graphene Nano sheets coated on a
copper foil by electrodeposition method.
Electrochemical hydrogen storage is
one of the hydrogen torage methods that has many applications due to its
availbility and the accuracy of its results. Different materials have been studied
for electrochemical hydrogen storage such as different composite materials
including nanostructured Ni/
graphene (Ni/GNS) (with electrochemical hydrogen storage apacity of 160 mA h g1
53+8), palladium-doped graphene/arbon composites (0.82 wt%) 53+13, graphene
sheets prepared by DC-Arc discharge method (147.8 mA h g1) 53+14, purified
and pened single walled carbon nanotubes (800 mA h g1) 53+15,purified
single-walled carbon nanotubes (SWCNTs)316 mA h g1) 53+16, multi-walled
carbon nanotubes (MWCNTs)decorated by TiO2 nanoparticles (NPs) with the
capacity of 40 mA h g1 53+17 and other hybrids 18,19. In this method, hydrogen
is produced by water decomposition on the surface of a polarized electrode in
an electrochemical cell and hydrogen is absorbed in the electrode as a hydrogen
storage material 14,17,19.
Theoretical predictions have revealed
that the graphene sheets with a few layers and larger interlayer spacing will
benefit for hydrogen storage.68+8. Graphene-based materials have better
properties compared to graphite, e.g. electrical conductivity, high surface
area and chemical tolerance that make it appropriate for hydrogen storage.53+8.
Since it was found in 2004.68+5.
graphene as a new member of carbon materials has particularly attracted a great
interest and has been demonstrated as a promising candidate for the
applications in electronics , photocatalysts
and also in hydrogen storage media.
materials, hydrogen sorption during
electro-decomposition of water on a cathodically polarized carbon electrode is
an alternative and elegant method for hydrogen storage68+2-3even though the
echanism is still under debate.68+4.
The storage of electrochemically
generated hydrogen under an ambient temperature and pressure has found a wide
application in the host materials. Due to the good electronic conductivity, low
density, chemical stability and wide variety of structures of carbonaceous
are different ways for hydrogen
storage such as pressurized gas cylinders, cryogenic liquid hydrogen,
electrochemical hydrogen storage, etc. None of these methods could meet the targets
set for global energy demand.53-2-4.
renewable sources of energy53+1. hydrogen
is an important green fuel due to its abundance in universe, delivering high
energy content of 142 MJ/kg and leaving the waste product as water86+4. There
In recent years the energy required
for human society and its resources was one of the most important and
challenging matters of governments. Nonrenewable nature of fossil fuels and
their negative environmental effects attracted great attention to green and