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<p>Transition metal oxides have emerged as promising candidates for electrochemical energy storage devices, such as batteries and supercapacitors, due to their versatile redox properties. However, challenges related to low energy density and limited cycling stability remain. In this study, MoO₃ (MO) and zinc (Zn)-MoO<sub>3</sub> (Zn-MO) nanoflakes were successfully synthesized via a hydrothermal method. The Zn-MO nanoflakes exhibited significantly enhanced electrochemical performance compared to pristine MO, achieving a high specific capacity of 82.7 mAh g⁻¹ and a capacitance of 647.8 F g⁻¹ at a current density of 2 A g⁻¹. Remarkably, after 10,000 charge–discharge cycles, the Zn-MO electrode retained 98% of its initial capacity with 99% coulombic efficiency. Furthermore, a pouch-type hybrid supercapacitor (HSC) was assembled using Zn-MO and activated carbon, delivering an energy density of 26.07 Wh kg⁻¹ and a power density of 5120 W kg⁻¹. The device demonstrated excellent cycling stability (90%) and high coulombic efficiency (99%), highlighting its practical applicability for real-world energy storage applications.</p> Graphical Abstract <p></p>

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Enhanced electrochemical performance of battery-type Zn-doped MoO₃ nanoflakes for hybrid supercapacitor applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月5日

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  • Purusottam Reddy B,
  • Mohamed A. Ghanem,
  • Boseong Son,
  • Huijin Kim,
  • Meenakshamma Ambapuram,
  • Ramanadha Mangiri,
  • Si-Hyun Park

摘要

Transition metal oxides have emerged as promising candidates for electrochemical energy storage devices, such as batteries and supercapacitors, due to their versatile redox properties. However, challenges related to low energy density and limited cycling stability remain. In this study, MoO₃ (MO) and zinc (Zn)-MoO3 (Zn-MO) nanoflakes were successfully synthesized via a hydrothermal method. The Zn-MO nanoflakes exhibited significantly enhanced electrochemical performance compared to pristine MO, achieving a high specific capacity of 82.7 mAh g⁻¹ and a capacitance of 647.8 F g⁻¹ at a current density of 2 A g⁻¹. Remarkably, after 10,000 charge–discharge cycles, the Zn-MO electrode retained 98% of its initial capacity with 99% coulombic efficiency. Furthermore, a pouch-type hybrid supercapacitor (HSC) was assembled using Zn-MO and activated carbon, delivering an energy density of 26.07 Wh kg⁻¹ and a power density of 5120 W kg⁻¹. The device demonstrated excellent cycling stability (90%) and high coulombic efficiency (99%), highlighting its practical applicability for real-world energy storage applications.

Graphical Abstract