Applied Surface Science, Vol.493, 1125-1133, 2019
TiO2-C nanowire arrays@polyaniline core-shell nanostructures on carbon cloth for high performance supercapacitors
TiO2-C@polyaniline (PANI) are synthesized on the surface of carbon cloth (CC) as flexible electrode, in which TiO2-C nanowire arrays (NWAs) work as supporting frame to enhance the mechanical stability of composites, while PANI is coated on TTiO2-C NWAs to make a core-shell structure and form a continuous conducive 3D network between isolated TiO2-C nanowires. By virtue of such unique structure design, the as-prepared TiO2-C@ PANI composites achieve desirable cycling performance while possess high specific capacitance. Concretely, this TiO2-C@PANI composite shows remarkable specific capacitance of 1818 F g(-1) at a current density of 1 A g(-1) good rate capability with 75.5% capacitance retention at 10 A g(-1), and excellent cycling performance with 80% capacity retention over 5000 cycles at a charge-discharge current of 10 A g(-1). Besides, the prefabricated TiO2-C@PANI//AC asymmetric hybrid supercapacitor also exhibits a high energy density of 32.4 Wh kg(-1) at a power density of 850.0 W kg(-1). In sum, such TiO2-C@PANI CC electrode material has a bright future in the application of supercapacitors and provides a new strategy for other conducive polymer-based electrochemical devices.
Keywords:Polyaniline;TiO2-C nanowire arrays;Core-shell structure;High specific capacitance;Good cycling performance