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<p>Hafnium oxide has demonstrated significant potential in the semiconductor industry, yet its application in energy storage remains underexplored. This study introduces a cost-effective and straightforward in situ chemical oxidative polymerization method to synthesize polypyrrole (PPy)-supported HfO<sub>2</sub> nanoparticles, showcasing improved structural, optical, and electrochemical properties for supercapacitor applications. When assessed as electrode materials, the (HfO<sub>2</sub>)<sub>0.7</sub>(PPy)<sub>0.3</sub> composite demonstrated superior electrochemical performance, with a superb specific capacitance of 804 F/g at 5 mV/s and 2 A/g, outstanding energy density of 31 Wh/kg at a remarkable power density of 1800 W/kg and compared to its component counterparts in an aqueous alkaline electrolyte (1M KOH). Moreover, the nanocomposite exhibits enhanced electrochemical kinetics and 83% capacity retention after 5000 charge–discharge cycles at 10 A/g. The exceptional electrochemical results indicate that HfO<sub>2</sub>/PPy nanocomposites represent a powerful approach for next-generation energy storage electrodes.</p> Graphical abstract <p></p>

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Fabrication of hafnium oxide/polypyrrole composite with enhanced electrochemical performance for supercapacitor electrode materials

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Muhammad Oneeb,
  • Javed Iqbal,
  • Asifa Mumtaz,
  • Arif Ullah

摘要

Hafnium oxide has demonstrated significant potential in the semiconductor industry, yet its application in energy storage remains underexplored. This study introduces a cost-effective and straightforward in situ chemical oxidative polymerization method to synthesize polypyrrole (PPy)-supported HfO2 nanoparticles, showcasing improved structural, optical, and electrochemical properties for supercapacitor applications. When assessed as electrode materials, the (HfO2)0.7(PPy)0.3 composite demonstrated superior electrochemical performance, with a superb specific capacitance of 804 F/g at 5 mV/s and 2 A/g, outstanding energy density of 31 Wh/kg at a remarkable power density of 1800 W/kg and compared to its component counterparts in an aqueous alkaline electrolyte (1M KOH). Moreover, the nanocomposite exhibits enhanced electrochemical kinetics and 83% capacity retention after 5000 charge–discharge cycles at 10 A/g. The exceptional electrochemical results indicate that HfO2/PPy nanocomposites represent a powerful approach for next-generation energy storage electrodes.

Graphical abstract