Layered MoS2/PPy nanotube composites with enhanced performance for supercapacitors

Using polypyrrole (PPy) nanotubes as the substrate, the layered molybdenum disulfide (MoS 2 ) nanosheets were wrapped on PPy nanotubes to form MoS 2 /PPy nanocomposites by a hydrothermal reaction. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that MoS 2 nanosheets coated uniformly on the surface of PPy nanotubes owing to the electrostatic force. The specific capacitance of the MoS 2 /PPy nanocomposites was high up to 307.5 F g −1 , much higher than that of the pure PPy with specific capacitance of 106.3 F g −1 and MoS 2 with specific capacitance of 138.5 F g −1 at a current density of 1.0 A g −1 in 1 M KCl electrolyte. And the special structure of MoS 2 /PPy nanocomposites electrode reduces the deformation during the charge–discharge process and thus improves the rate stability and electrochemical cycling stability of the electrode significantly. The specific capacitance retains 96.47 % after 1000 charge–discharge processes which provides potential as supercapacitors.