Synthesis of MnO2/graphene/carbon nanotube nanostructured ternary composite for supercapacitor electrodes with high rate capability

• A new method for fabricating MnO2/graphene/CNTs composite is presented.
• The electrode exhibits excellent rate capability than almost reported papers.
• A high capacitance of 240 F g−1 is obtained for the constituent MnO2.
• This strategy is cost-efficient and easily scaled up to industrial quantities.

A composite of graphene nanosheets (GNS) decorated with manganese dioxide (MnO2) nanoparticles and interconnected by carbon nanotubes (CNTs) has been synthesized through a facile chemical method. SEM results suggest a homogeneous distribution of MnO2 nanoparticles (50–80 nm in size) on graphene nanosheets and excellent interconnectivity by CNTs. The MnO2/GNS/CNTs electrode exhibits excellent rate capability and significantly improved cycling stability (95% capability retained after 1000 cycles), and a high capacitance of 240 F g−1 is obtained for nanoscale MnO2. In addition, the method for the synthesis of MnO2/GNS/CNTs composites is simple and can be easily scaled up to real industrial manufacturing.

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