Facile Route to an Efficient NiO Supercapacitor with
a Three-Dimensional Nanonetwork Morphology
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Abstract
NiO nanostructures with three distinct
morphologies were fabricated by a sol–gel method and their
morphology-dependent supercapacitor properties were exploited. The
nanoflower- shaped NiO with a distinctive three-dimensional (3D) network
and the highest pore volume shows the best supercapacitor properties.
The nanopores in flower-shaped nanostructures, offering advantages
in contact with and transport of the electrolyte, allow for 3D nanochannels
in NiO structure, providing longer electron pathways. The XPS and
EIS data of the NiO nanostructure confirm that the flower-shaped NiO,
which has the lowest surface area among the three morphologies, was
effectively optimized as a superior electrode and yielded the greatest
pseudocapacitance. This study indicates that forming a 3D nanonetwork
is a straightforward means of improving the electrochemical properties
of a supercapacitor