Carbon nanotubes decorated NiSe2 nanosheets for high-performance supercapacitors

This work reports the fabrication of carbon nanotube (CNT) decorated NiSe 2 nanosheets (NiSe 2 @CNT) by a rapid microwave process in 2 min. Interestingly, NiSe 2 @CNT has a lamellar and tubular interwoven morphology. The specific capacitance of the prepared electrodes with different microwave conditions for supercapacitors were studied. Meanwhile, we compared the electrochemical performances of NiSe 2 @CNT with the presence of different amount of CNT. The optimal NiSe 2 @CNT electrode can demonstrate a high specific capacitance of 980.5 F g −1  at a current density of 1 A g −1 and good cycling stability of 82% retention after 9000 cycles at 5 A g −1 . In addition, an asymmetric supercapacitor was assembled by NiSe 2 @CNT as positive electrode and activated carbon (AC) as negative electrode , which successfully light four white light emitting diodes (LEDs) for 6 min with an energy density of 25.61 Wh kg −1 at a power density of 810 W kg −1 .