Abstract
Nb2O5/graphene nanocomposites without any surfactant are synthesized by an in situ microwave irradiation technique. Structural and morphological studies revealed that the prepared composites were composed of Nb2O5 nanoparticles intercalated into the graphene sheet. The thermal stability of graphene oxide, Nb2O5, and Nb2O5/graphene nanocomposite was studied by the TGA. The electrochemical properties are assessed by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy analyses. The specific capacitance of Nb2O5/graphene nanocomposites is greater (633 Fg−1) than pure Nb2O5 nanoparticles (221 Fg−1) and graphene (290 Fg−1) at a current density of 1 Ag−1. The long-term cyclic measurement confirms higher cyclic stability of the nanocomposite with capacitance retention of 99.3% after 5000 cycles without performance degradation. The composites exhibit higher electrochemical conductivity and allow effective ions and charge transport over the entire electrode surface with aqueous electrolyte. The electrochemical study suggests that Nb2O5/graphene nanocomposites have the potential to be an effective electrode for superior performance supercapacitor applications.
Highlights
In recent years, the depletion of natural energy sources due to the industrialization of technological advancements has been alarming
Among the most important requirements is the judicious use of available energy, and an efficient mechanism for energy storage [1]
Electrochemical capacitors can be divided into two categories, depending on the storage process
Summary
The depletion of natural energy sources due to the industrialization of technological advancements has been alarming. The second type is the electric double-layer capacitor (EDLC), which involves an electrostatic process for storage These types of materials include the carbon family, including activated carbon, carbon aerogels, carbon nanotubes, and graphene, which exhibit high surface area. A new approach is demonstrated for synthesizing high-quality Nb2O5 nanoparticles combined with graphene without any surfactant via a one-step in situ microwave irradiation method. This process is inexpensive, straightforward, and can be readily adopted for the production of larger quantities of nanoparticles. This ultrafast, eco-friendly microwave irradiation method is used to prepare graphene and demonstrated the decoration of G surface with Nb2O5 nanoparticles. The synergistic effect of T-Nb2O5 and G composite exhibits promising properties with higher capacitance and very good sustainability in aqueous electrolyte
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