Facile one-pot synthesis of NiCo 2 Se 4 -rGO on Ni foam for high performance hybrid supercapacitors.

A facile, innovative synthesis for the fabrication of NiCo 2 Se 4 -rGO on a Ni foam nanocomposite via a simple hydrothermal reaction is proposed. The as-prepared NiCo 2 Se 4 -rGO@Ni foam electrode was tested through pxrd, TEM, SEM, and EDS to characterize the morphology and the purity of the material. The bimetallic electrode exhibited outstanding electrochemical performance with a high specific capacitance of 2038.55 F g -1 at 1 A g -1 . NiCo 2 Se 4 -rGO@Ni foam exhibits an extensive cycling stability after 1000 cycles by retaining 90% of its initial capacity. A superior energy density of 67.01 W h kg -1 along with a high power density of 903.61 W kg -1 further proved the high performance of this electrode towards hybrid supercapacitors. The excellent electrochemical performance of NiCo 2 Se 4 -rGO@Ni foam can be explained through the high electrocatalytic activity of NiCo 2 Se 4 in combination with reduced graphene oxide which increases conductivity and surface area of the electrode. This study proved that NiCo 2 Se 4 -rGO@Ni foam can be utilized as a high energy density-high power density electrode in energy storage applications.