부산대학교 도서관

Graphene/nano-sulphur (S)/polyaniline (PANI) ternary nanocomposite was successfully synthesised and used as an electrode material for supercapacitors. In this process, the aniline was selected to accomplish two functions: In the first place, it served as a reducing agent, promoting the reduction of graphene oxide to graphene, without any additional reducing agent. In the second place, it played an important role in the formation of PANI. S nanoparticles were uniformly decorated on the graphene surface, and PANI covered the graphene/S surface. Furthermore, graphene and PANI prevented polysulphide species diffusion. The products were characterised by field-emission scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectra, X-ray photoelectron spectroscopy, Raman spectroscopy and electrochemical analysis. Owing to the specific combination of the advantages of graphene, nano-S and PANI, the composite exhibited outstanding electrochemical performance showing a specific capacitance as high as 619 F [g.sup.-1] at a scan rate of 5 mV [s.sup.-1] and excellent electrochemical stability with a retention of 77.9% (457 F [s.sup.-1]) of initial capacitance (586.8 F [s.sup.-1]) after 500 cycles at a current density of 1 A [s.sup.-1]. Keywords Graphene, nano-sulphur, polyaniline, ternary nanocomposite, supercapacitor
Introduction Driven by the growing demand for sustainable energy and portable electronics, the storage devices with high power and energy densities have become an urgent and necessary issue with a [...]