Amorphous molybdenum sulfide on graphene–carbon nanotube hybrids as supercapacitor electrode materials

Abstract

Herein, we report the application of amorphous molybdenum sulfide (MoS_x, x ≈ 3) as the main active material for supercapacitor electrodes. MoS_x was deposited at room temperature onto a high specific surface area electrode made of graphene–carbon nanotube hybrids directly grown on carbon paper (GCNT/CP), using an electrochemical deposition method. The MoS_x/GCNT/CP electrode showed high specific capacitance. A gravimetric specific capacitance of 414 F g⁻¹ was demonstrated at a constant discharge rate of 0.67 A g⁻¹. The deposition of MoS_x onto a conductive, high surface area support played a crucial role for a high specific capacitance. An up to 4.5-fold enhancement in specific capacitance was demonstrated when MoS_x was deposited on GCNT/CP as compared to MoS_x deposited on a simple carbon paper support. The MoS_x/GCNT/CP electrode is suggested to be a novel candidate for supercapacitor applications.