Amorphous Cobalt Boron Alloy@Graphene Oxide Nanocomposites for Pseudocapacitor Applications.

Amorphous Co–B alloy nanoparticles grown on graphene sheets were synthesized via a chemical reduction approach and successfully used for an application as a pseudocapacitor. This study aims to improve the capacity and cycling stability of amorphous Co–B alloy nanoparticles grown on conductive graphene sheets. The products were characterized by X-ray powder diffraction, scanning electron microscopy, and transmission electron microscopy. As electrode materials for pseudocapacitors, the amorphous Co–B alloy grown on graphene oxide (Co–B@GO) exhibits a high specific capacitance of 460 F g −1 , which is nearly 1.5 times greater than that of bare Co–B nanoparticles at 1 A g −1 . The specific capacitance preserved 84% of the initial capacitance even after 1000 cycles at a scan rate of 10 m V −1 , suggesting its promising potential as pseudocapacitor materials. [ABSTRACT FROM AUTHOR]