Electrolytic induced effects on hafnium oxide based electrode material

In the context of role and influence of electrolyte on the performance of energy storage devices, here in, we have reported the electrochemical energy storage application of Hafnium oxide nanostructures in various aqueous ionic electrolytes. The morphological, structural, thermal, optical, and dielectric characteristics of Hafnium oxide nanostructures have been systematically probed. The traits of nanostructure design of electrode material are successfully linked with electrochemical properties, in alkaline, neutral and acidic electrolytic media, in order to comprehend the charge storage mechanism at electrode - electrolyte interface. It has been observed that the charge storing capacity in acidic electrolyte of 1 M H2SO4, computed as 212 F g−1 at a scan rate of 5 mV s−1, is superior as compared to other investigated electrolytes of KOH, NaOH and Na2SO4 respectively. Moreover, an energy density of 7.36 W - hr kg−1 and a power density of 181.47 W kg−1 have been achieved in IM H2SO4. [Display omitted] •Structural authentication through Raman, SEM, XRD, TGA, UV and PL.•Dielectric studies.•Electrochemical screening through CV, GCD and EIS.