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<p>The development of high-energy asymmetric supercapacitors (SC) having suitable electrodes is desperately needed to make them more beneficial. Due to their numerous oxidation states and greater energy storage capacity compared to conventional carbon-based materials, redox-active materials are advantageous in applications involving improved energy SCs. In this work, we have combined nanoplates like FeS with hexagonal WO₃ in a single cell to design and produce high-energy aqueous asymmetric SC for the first time. With aqueous KOH electrolyte, the produced FeS and WO₃ show outstanding electrochemical properties in the negative voltage window because of their enhanced redox activity, nanoporous surface structure, and electrical conductivity. Synthesized nanocomposite having a ratio of 1:2 shows improved crystallinity, according to the XRD experimental data. At 1&#xa0;A g<sup>− 1</sup> of current density, FeS/WO3 (FW-2) exhibits enhanced specific capacitance of 474&#xa0;F g<sup>− 1</sup>, better than FW-1 delivering 300&#xa0;F g<sup>− 1</sup>, and pristine FeS and WO3 show 144 and 62&#xa0;F g<sup>− 1</sup> in three-electrode setups. At a power and energy density of 800&#xa0;W kg⁻¹ and 34 Wh kg⁻¹, comparing with FW-1 (1:1), which delivers 24 Wh kg⁻¹ and 807&#xa0;W kg⁻¹ energy and power density, the fabricated FeS/WO₃//AC (FW-2) asymmetric SC appliance shows remarkable electrochemical activity under an operational voltage boundary of 1.6&#xa0;V and exceptional cyclic stability of approximately 92% (after 4000 cycles) at 2&#xa0;A g⁻¹. These findings demonstrate that, in comparison to conventional carbon-based asymmetric SCs, redox-active materials can significantly increase the energy storage capacity of SCs.</p> Graphical Abstract <p></p>

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Ferric Sulfide (FeS)-Based Tungsten Oxide (WO3) Nanostructures Made Using a Hydrothermally Assisted Wet-Chemical Technique for Supercapacitors: Investigation Utilizing Structure and Electrochemistry

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Lubna Aamir,
  • Dost Muhammad,
  • Syed Hatim Shah,
  • Muhammad Tauseef Qureshi,
  • Ghazala Yunus,
  • A. Wahab M. A. Hussein,
  • Ala’a Nowara,
  • Marwa S. Salem,
  • Nisar Ali,
  • Mohammad M. Al-Hinaai

摘要

The development of high-energy asymmetric supercapacitors (SC) having suitable electrodes is desperately needed to make them more beneficial. Due to their numerous oxidation states and greater energy storage capacity compared to conventional carbon-based materials, redox-active materials are advantageous in applications involving improved energy SCs. In this work, we have combined nanoplates like FeS with hexagonal WO₃ in a single cell to design and produce high-energy aqueous asymmetric SC for the first time. With aqueous KOH electrolyte, the produced FeS and WO₃ show outstanding electrochemical properties in the negative voltage window because of their enhanced redox activity, nanoporous surface structure, and electrical conductivity. Synthesized nanocomposite having a ratio of 1:2 shows improved crystallinity, according to the XRD experimental data. At 1 A g− 1 of current density, FeS/WO3 (FW-2) exhibits enhanced specific capacitance of 474 F g− 1, better than FW-1 delivering 300 F g− 1, and pristine FeS and WO3 show 144 and 62 F g− 1 in three-electrode setups. At a power and energy density of 800 W kg⁻¹ and 34 Wh kg⁻¹, comparing with FW-1 (1:1), which delivers 24 Wh kg⁻¹ and 807 W kg⁻¹ energy and power density, the fabricated FeS/WO₃//AC (FW-2) asymmetric SC appliance shows remarkable electrochemical activity under an operational voltage boundary of 1.6 V and exceptional cyclic stability of approximately 92% (after 4000 cycles) at 2 A g⁻¹. These findings demonstrate that, in comparison to conventional carbon-based asymmetric SCs, redox-active materials can significantly increase the energy storage capacity of SCs.

Graphical Abstract