Background: Renewable energies are in great demand because of the shortage of
traditional fossil energy and the associated environmental problems. Ni and Se-based materials
are recently studied for energy storage and conversion owing to their reasonable conductivities
and enriched redox activities as well as abundance. However, their electrochemical
performance is still unsatisfactory for practical applications.
Objective: To enhance the capacitance storage of Ni-Se materials by modification of their
physiochemical properties with Fe.
Methods: A two-step method was carried out to prepare FeNi-Se loaded reduced graphene
oxide (FeNi-Se/rGO). In the first step, metal salts and graphene oxide (GO) were mixed under
the basic condition and autoclaved to obtain hydroxide intermediates. As a second step,
selenization process was carried out to acquire FeNi-Se/rGO composites.
Results: X-ray diffraction measurements (XRD), nitrogen adsorption at 77K, scanning electron
microscopy (SEM) and transmission electron microscopy (TEM) were carried out to
study the structures, porosities and the morphologies of the composites. Electrochemical
measurements revealed that FeNi-Se/rGO notably enhanced capacitance than the NiSe/G
composite. This enhanced performance was mainly attributed to the positive synergistic effects
of Fe and Ni in the composites, which not only had an influence on the conductivity of
the composite but also enhanced redox reactions at different current densities.
Conclusion: NiFe-Se/rGO nanocomposites were synthesized in a facile way. The samples
were characterized physicochemically and electrochemically. NiFeSe/rGO giving much
higher capacitance storage than the NiSe/rGO explained that the nanocomposites could be
an electrode material for energy storage device applications.
Keywords: Capacitance, electrochemistry, energy storage, graphene, iron, nanocomposite, nickel, selenide,
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