A novel hierarchical CoNi2S
4 arrays consisting of uniformly coverage of thin sheets and
numerous nanobranches on Ni foam has been successfully prepared via a simple one-step
hydrothermal route without any surfactant and template. The CoNi2S
4 arrays were investigated
as electrode material for supercapacitors. The ordered CoNi2S
4 arrays self-grown on Ni foam
provided an excellent conducting connection with electrode substrates. Meanwhile, the thin
sheets on top of the arrays is interconnected, forming a highly specific surface area. The unique
architecture has constructed many independent nanospaces to participate in electrochemical
reaction. Detailed electrochemical characterization showed the novel structure has an
excellent electrochemical capacitance, high rate performance and high areal capacitance.
The cost-effective synthesis of CoNi2S
4 arrays and remarkable electrochemical performance
provided great potential for this type of hybrid hierarchical nanostructures in supercapacitors.
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