Innovative hafnium oxide-vanadium oxide electrode with remarkably enhanced specific capacitance for supercapacitors

Asifa Mumtaz, Javed Iqbal, Misbah Mumtaz and Muhammad Oneeb

Energy, 2025, vol. 324, issue C

Abstract: The aim of the reported work is to design and optimize electroactive species for energy storage applications. We report novel (Hafnium oxide)x – (Vanadium oxide)1-x electrode (x = 1, 0.75, 0.50, 0.25, 0), synthesized in different stoichiometric proportions, demonstrating outstanding performance as a supercapacitor. A comprehensive understanding of the underlying physical parameters has been achieved through structural and morphological characterizations. Subsequently, an in-depth electrochemical analysis has been performed via standard electrochemical characterization techniques of cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The reported electrode exhibited a notable energy density of 41.39 Wh kg−1 alongside a satisfactory power density of 255.58 W kg−1. Furthermore, nominated electrode demonstrated a remarkable capacitance retention of 88 % over 3000 cycles. Both, the choice of nanocomposite materials and the nanostructured architecture of the electrode proved pivotal for achieving high-performance supercapacitor electrode.

Keywords: Hafnium oxide; Vanadium oxide; Supercapacitor; Cyclic voltammetry; Electrochemical impedance spectroscopy (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:324:y:2025:i:c:s0360544225016846

DOI: 10.1016/j.energy.2025.136042

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