Nitrogen and sulfur co-doped glucose (GC)-based porous carbon electrode materials for supercapacitors have been prepared by a hydrothermal process using thiourea as nitrogen and sulfur sources and subsequent activation with KOH at 750 • C. The specific surface area of doped porous GC reaches 561.44 m 2 g −1 when the mass ratio of KOH to GC was 1:1 and the mesoporous volume is 0.125 cm 3 g −1 . The electrochemical performances of the electrode made with the doped porous GC were tested in a three-electrode system with 6 M KOH solution as electrolytes. The specific capacitance of the activated porous GC reaches 281 F g −1 at the current density of 1 A g −1 and increases about 7% at the current density of 5 A g −1 after 5000 charge-discharge cycles, indicating its excellent electrochemical stability as a promising electrode.

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For twenty years, researchers have investigated nanodielectric composites to advance their dielectric properties toward practical applications in capacitors and electrical insulation. Novel concepts are highly anticipated to enhance dielectric strength...

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Using molecular dynamics simulations, we investigate the movement behavior of double-walled carbon nanotube containing single atom vacancy defect and Stone–Wales defect. The carbon nanotube thermal actuator consists of a short outer tube and a long inner tube driven under temperature gradient. It is found that the presence of these defects introduces resistance of the nanotube systems, which affects their amplitude and speed. The oscillation motion of the outer nanotube is found possible to be produced, which can be achieved by devising proper initial position of the outer tube, the defect type and the temperature gradient. Our results demonstrate the effect of defects on the motion of carbon nanotubes and show that it is possible to control and tune the motion behavior of nanotubes through the introduction of defects.