The hierarchical synthesis of tungsten disulfide coated vertically aligned boron carbon nitride nanotubes composite electrodes for supercapacitors

This study investigated the specific capacitance, energy density and cyclic stability parameters of a WS2 coated vertically aligned BCN nanotubes (VA-BCN-NTs) composite electrode structure. The specific capacitance of VABCN-NTs was found to be 364 Fg- 1 at a current density of 0.5 Ag- 1. This electrode had 97% of their initial specific capacitance after 10,000 cycles at a current density of 20 Ag- 1, exhibiting excellent cyclic stability. In the three-electrode cell, the specific capacitance of the VA-BCN-NT@WS2 electrode at a current density of 0.5 Ag- 1 was calculated to be 690 Fg- 1. After 5000 cycles at a current density of 20 Ag- 1, the electrode structure had a capacitance value of 74%, showing good stability. In the two-electrode cell, the specific capacitance of the VA-BCN-NT@WS2 symmetrical supercapacitor at a current density of 1 Ag- 1 was found to be 170 Fg- 1. It was observed to have retained 85% of its capacitance after 10,000 cycles over a 1 V potential range. While the energy density of this structure was 23.6 Whkg- 1, the power density was 4250 W kg-1.