a This work reported Co 9 S 8 nanoparticle-decorated carbon nanofibers (CNF) as a supercapacitor electrode.By using a mild ion-exchange method, the cobalt oxide-based precursor nanoparticles were transformed to Co 9 S 8 nanoparticles in a microwave hydrothermal process, and these nanoparticles were decorated onto a carbon nanofiber backbone. The composition of the nanofibers can be readily tuned by varying the Co acetate content in the precursor. The porous carbon nanofibers offered a fast electron transfer pathway while the well dispersed Co 9 S 8 nanoparticles acted as the redox center for energy storage. As a result, high specific capacitance of 718 F g À1 at 1 A g À1 can be achieved with optimized Co 9 S 8 loading. The assembled asymmetric supercapacitor with Co 9 S 8 /CNF as the cathode showed a high energy density of 23.8 W h kg À1 at a power density of 0.75 kW kg À1 and good cycling stability (16.9% loss over 10 000 cycles).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.