Exploring
electrochemically chapped graphite/graphene composites
derived from the bulk carbon rod of the spent Zn/carbon primary cell
is for the advanced high-capacity lithium-ion battery anode. It is
found that the synthesized graphitic carbon has grain boundary defects
with multilayered exfoliation. Such material exhibits an average specific
capacity of 458 mA h g–1 at 0.2 C, which is higher
than the theoretical specific capacity (372 mA h g–1) of graphite. The differential specific capacity calculations also
show no significant difference in lithiation and delithiation potentials
for the exfoliated sample at the low voltage. However, two additional
plateaus have also been observed at ∼1.2 and 2.5 V, which confirms
the formation of the LiC3 phase similar to lithiation of
graphene. Hence, the superior lithiation ability and thecycling stability
of defected graphite/graphene flakes may be useful for the sustainable
development of next-generation high energy lithium-ion batteries.
Also, waste recovery tends to reduce the risk of environmental pollution
and the cost of raw materials.
This research aims to investigate photocatalytic activities of titanium dioxide (TiO2) incorporated with reduced graphene oxide (rGO) nanocomposite catalysts. These TiO2-rGO photocatalysts were easily prepared through a direct-mixing of TiO2powder suspended in acidic solution under the different amounts of rGO loading (0.25, 0.50, 0.75 and 1.00 wt%). Then, the obtained TiO2-rGO samples were characterized by a several techniques. The results demonstrated that the crystalline phases of all samples are corresponding to pristine TiO2, whereas the characteristic peaks of rGO in the TiO2-rGO nanocomposites could be observed and also well-confirmed by Raman spectroscopy. TEM results showed that the TiO2nanoparticles were well-combined with rGO nanosheets. Moreover, the photocatalytic activities of all TiO2-rGO photocatalyst samples were evaluated by photodegrading of methylene blue (MB) dye solution under natural sunlight irradiation. The results revealed that all TiO2-rGO nanocatalysts exhibited much higher activity than those of the bare TiO2. The improved photocatalytic activity can be attributed to the presence of rGO nanosheets, leading to the decrease of electron (e-) - hole (h+) recombination of TiO2catalyst, increasing charge transfer rate of electrons and surface-adsorbed amount of MB molecules which enhances the photocatalytic activity.
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