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Facile hydrothermal synthesis of Au-Mn3O4 decorated graphene oxide nanocomposites for solid-state supercapacitor

JOURNAL OF ENERGY STORAGE(2022)

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Abstract
Nanocomposites of Au-Mn3O4 flowers decorated on graphene oxide have been developed through a hydro thermal technique to improve the efficiency and electrochemical behavior of transition metal oxide (TMO)-based energy materials. The mechanism for the formation of the flower morphology of the nanocomposites has been proposed with the help of time-dependent electron microscopy imaging. The surface properties and chemical composition of the nanocomposites were thoroughly investigated. The optimized nanocomposite has shown a high specific capacitance (475 F g(-1)) and excellent energy density (55.8 W h kg( 1)). The charge storage mechanism of the materials was also examined to provide an in-depth understanding of the superior electrochemical performance of the nanocomposites. In addition, the presence of graphitic carbon in the nanocomposites has resulted in better cycle stability of Au-Mn3O4//GO in an acidic electrolyte.
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Key words
<p>Au-Mn3O4 nanocomposite</p>, Graphene oxide, Flower morphology, Pseudocapacitance, Long-term stability
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