Synthesis of graphene oxide supported CoSe2 as high-performance supercapattery electrodes

We report on the facile synthesis of graphene oxide (GO) supported CoSe 2 (CoSe 2 /GO) used for high-performance supercapattery electrodes. CoSe 2 is first synthesized through the selenylation of a typical zeolitic imidazolate framework (ZIF-67), which is then decorated on the surface of GO via the hydrothermal method. The characterizations of SEM, TEM, XRD and XPS further confirm the successful decoration of GO with CoSe 2 . The electrochemical performances of the as-synthesized CoSe 2 /GO are investigated, and the results indicate that the CoSe 2 /GO exhibits considerable specific capacity (108.31 mAh g −1 at 1 A g −1 ) and high cyclic stability (capacity retention of 91.2% after 5,000 cycles). Compared with GO and CoSe 2 alone, the greatly enhanced electrochemical performances of the CoSe 2 /GO might be attributed to the synergistic effect of GO and CoSe 2 . These findings suggest that the developed CoSe 2 /GO could be a potential candidate to be used as high-performance supercapattery electrode materials.