Pulsed Laser Deposition of NiSe2 Film on Carbon Nanotubes for High-Performance Supercapacitor

Amorphous NiSe was deposited on the carbon nanotubes (CNTs) networks by the pulsed laser deposition method forming the 2 -1 -1 CC@CNT@NiSe composites.The CC@CNT@NiSe electrode exhibits a high specific capacitance of 696 F g at 2 A g and the specific 2 2 capacitance retention of 74 % in the long life test.To evaluate the practicality of our electrode, we assembled the CC@CNTs@NiSe //CC@CNTs 2 asymmetric supercapacitor using CC@CNTs@NiSe as positive electrode and CC@CNTs as the negative electrode, which shows an energy 2 -1 -1 density of 11.9 Wh kg at a power density of 242 W kg .This work highlights the advantageous electrochemical performance of NiSe film on 2 CNTs, in which the highly conductive CNTs provide plentful electronic conduction channels and the NiSe film exposures more active sites.