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Thiourea aldehyde resin-based heteroatom doping carbon and graphene composites (RHDC/GN) were prepared by an in situ polymerization and carbonization. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that thiourea aldehyde resin deposited on lamellar GO flakes during the polymerization and RHDC/GN composites had a hierarchical structure. The specific capacitance of the RHDC/GN composites was high up to 355 F g, much higher than that of the pure thiourea aldehyde resin-based heteroatom doping carbon (RHDC) with specific capacitance of 135 F g at a current density of 1.0 A g in 6-M KOH electrolyte. And the hetroatoms in RHDC/GN composites increase the specific capacitance, and GN enhances the conductivity of the electrodes which is beneficial to improving electrochemical cycling stability of the electrode significantly. The specific capacitance retains 90.97% after 5000 charge-discharge processes at 10 A g, which provides potential as supercapacitors. [ABSTRACT FROM AUTHOR]

Using polypyrrole (PPy) nanotubes as the substrate, the layered molybdenum disulfide (MoS) nanosheets were wrapped on PPy nanotubes to form MoS/PPy nanocomposites by a hydrothermal reaction. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that MoS nanosheets coated uniformly on the surface of PPy nanotubes owing to the electrostatic force. The specific capacitance of the MoS/PPy nanocomposites was high up to 307.5 F g, much higher than that of the pure PPy with specific capacitance of 106.3 F g and MoS with specific capacitance of 138.5 F g at a current density of 1.0 A g in 1 M KCl electrolyte. And the special structure of MoS/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. [ABSTRACT FROM AUTHOR]