MnO2 Encapsulated Electrospun TiO2 Nanofibers as Electrodes for Asymmetric Supercapacitors.
We have reported a facile technique to fabricate MnO2 encapsulated TiO2 nanofiber heterostructure for their use as an electrode material in aqueous electrolyte based asymmetric supercapacitor. Manganese dioxide coated titanium dioxide (MnO2 TiO2) nanofibers, prepared by electrospinning and post hydrothermal process exhibited high electrochemical properties in aqueous Na2SO4 electrolyte. The thin MnO2 shell with average thickness of 10 nm contributed to the high electrochemical performance for charge storage by redox reaction and intercalation mechanisms, while the anatase phase TiO2 core provided an easy pathway for electronic transport with additional electrochemical stability over thousands of charge discharge cycles. An asymmetric supercapacitor designed from the MnO2 TiO2 nanofibers and single walled carbon nanotubes showed high voltage window (2.2 V) with maximum gravimetric capacitance of 111.5 Fg 1.
Nanotechnology