Synthesis
of Novel ZnV<sub>2</sub>O<sub>4</sub> Hierarchical Nanospheres and
Their Applications as Electrochemical Supercapacitor and Hydrogen
Storage Material
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Abstract
Hierarchical nanostructures (Hs)
have recently garnered enormous attention due to their remarkable
performances in catalysis, electronic devices, energy storage and
conversion. Considering the advantage of hierarchical nanostructures,
we have formulated a facile and template free method to synthesize
novel hierarchical nanospheres (NHNs) of ZnV<sub>2</sub>O<sub>4</sub>. Both zinc and vanadium are earth abundant, relatively economical
and can offer several oxidation states, which can render a broad range
of redox reactions favorable for electrochemical energy storage applications.
Keeping these points in mind, we investigated for the first time the
electrochemical supercapacitor performance of NHNs. The electrochemical
measurements were performed in 2 M KOH solution. The measured specific
capacitance of ZnV<sub>2</sub>O<sub>4</sub> electrode is 360 F/g at
1 A/g with good stability and retention capacity of 89% after 1000
cycles. Moreover, the hydrogen storage properties of NHNs were measured
at 473, 573, and 623 K with an absorption of 1.76, 2.03, and 2.49
wt %. respectively. These studies pave the way to consider ZnV<sub>2</sub>O<sub>4</sub> as prospective material for energy storage applications