Fabrication and electrochemical properties of cylindrical hybrid supercapacitor using H2Ti12O25 as anode material

Abstract

We successfully prepare H2Ti12O25 by soft-chemical synthesis using Na2Ti3O7 compounds, prepared by Na+/H+ ion exchange and heating. Then, a cylindrical hybrid supercapacitor is fabricated by using H2Ti12O25 as anode and activated carbon as cathode. The specific capacitance of hybrid supercapacitor using H2Ti12O25 is 57 Fg(-1) higher than that of hybrid supercapacitor using Li4Ti5O12 (38 Fg(-1)). The hybrid supercapacitor using H2Ti12O25 exhibit cycle performance with a capacitance retention of 65.3% available for battery application. The energy density is 35W h kg(-1) at a power density of 179W kg(-1) and 4W h kg(-1) at a power density of 5383W kg(-1). These results show that the H2Ti12O25 anode material is a promising electrode material for hybrid supercapacitor. (C) 2014 Elsevier B.V. All rights reserved.