Rational design of NiSe2@rGO nanocomposites for advanced hybrid supercapacitors

Hybrid supercapacitors represent a promising candidate for grid-scale energy storage devices because of their excellent high-power density, inherent safety and low cost. Here we report a novel NiSe 2 @rGO nanocomposite (reduced graphene oxide decorated NiSe 2 nanoparticles), which shows high specific capacity of 467 C g −1 at 1 A g −1 and superior rate performance (∼72.8% of the capacity retention at 20 A g −1 ). Moreover, a hybrid supercapacitor (HSC) assembled from the NiSe 2 @rGO positive electrode and rGO negative electrode delivers high energy density (34.3 Wh kg −1 ) and splendid cycling lifespan (∼93% of the capacity retention over 6500 cycles). This study provides a novel insight on high-performance hybrid supercapacitors.