Search

Abstract: Uniform and conformal coating of ultrathin molybdenum oxide (MoO3) thin film onto conducting MWCNTs was successfully synthesized through a facile, nontoxic and generally applicable precipitation method, followed by a simple heat treatment. The ultrathin MoO3 coating enables a fast and reversible redox reaction which improves the specific capacitance by utilizing the maximum number of active sites for the redox reaction, while the high porosity of the MWCNTs facilitates ion migration in the electrolyte and shorten the ion diffusion path. The ultrathin MoO3 coated MWCNTs electrodes show a very high specific capacitance of 1145 Fg−1 in 2M Na2SO4 aqueous solution when 5nm thick MoO3 was considered alone despite the low weight percentage of the MoO3 (16wt%). Furthermore, the ultrathin MoO3 coated MWCNTs supercapacitor electrodes exhibited excellent cycling performance of>97% capacitance retention over 1000 cycles. [Copyright &y& Elsevier]

A ternary nanocomposite of molybdenum trioxide (α-MoO 3 ) nanowires coated with a thin layer of carbon, which is intertwined with graphene oxide is synthesized by hydrothermal and ultrasonication route. It is found that high conductivity of carbon coated MoO 3 nanowires is further increased by introducing the graphene sheets. The ternary nanocomposite (rGO/MoO 3 @C) exhibits high specific capacitance, excellent cyclic stability compared to the carbon coated MoO 3 (MoO 3 @C) and virginal MoO 3 nanowires due to the synergistic effect of carbon layer and graphene. The electrochemical impedance measurements show that rGO/MoO 3 @C nanocomposite have lower charge transfer resistance as compared to MoO 3 @C and MoO 3 nanowires electrodes. Two probe electrical conductivity ( I–V ) measurements confirm the enhanced conductivity of rGO/MoO 3 @C nanocomposite relative to MoO 3 @C and bare MoO 3 nanowires. The electrical and electrochemical measurements indicate that the rGO/MoO 3 @C nanocomposite is promising candidate for energy storage applications. [ABSTRACT FROM AUTHOR]