Cobalt-doped Ni3S2 nanorod arrays have been prepared via a hydrothermal method. As a free-standing electrode, the Co-Ni3S2 demonstrates ultrahigh areal capacitance, affording the Co-Ni3S2//FeOOH hybrid supercapacitor a high energy density.
α-NiS/rGO nanohybrids synthesized from water-refluxed Ni-MOF-74/rGO were applied as a high-performance hybrid supercapacitor positive electrode for the first time.