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<p>To enhance the electrochemical performance of a Ni-ZnO composite electrodeposited onto indium tin oxide (ITO) glass for supercapacitor applications, we incorporated MnO₂ in three incremental stages to elaborate a ZnO/Ni/MnO₂ hybrid composite. The addition of MnO₂ introduced a significant synergistic effect with the ZnO/Ni framework, resulting in a marked improvement in the composite’s performance, particularly achieving an operational potential beyond 0.7 V versus the standard calomel electrode (SCE) and an increase in effective surface area. The ZnO-Ni-MnO₂ composite was thoroughly characterized to understand its structure and electrochemical behavior. X-ray diffraction (XRD) analysis confirmed the distinct crystalline phases of ZnO, Ni, and MnO₂, indicating successful integration. Scanning electron microscopy (SEM) revealed a unique blackberry-like morphology in the material, which is highly favorable for supercapacitor applications due to the increased surface area and porous structure, promoting efficient ion diffusion and charge storage. Energy-dispersive X-ray spectroscopy (EDS) verified the elemental composition and uniform dispersion of MnO₂ within the ZnO-Ni matrix, further validating the composite’s homogeneity. Electrochemical impedance spectroscopy (EIS) demonstrated an enhanced charge transfer capability with the incorporation of MnO₂, as reflected by a reduction in charge transfer resistance, indicative of improved conductivity and faster ion dynamics within the composite. Cyclic voltammetry (CV) tests conducted at a 10 mV/s scan rate in a 0.5 M Na₂SO₄ aqueous electrolyte, over a voltage window from 0 to 0.85 V, showcased the ZnO-Ni-MnO₂ composite’s high specific capacitance of 251.3 F/g at a current density of 0.3 A/g. Notably, this performance was achieved without the use of additional binders or conductive additives, a significant advantage for practical applications.</p>

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Enhanced performance of Ni-ZnO-MnO2 composite alloy deposited on ITO glass for supercapacitor applications: a three-stage synergistic boost

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Sara Taghzouti,
  • Hamza Hailou,
  • Khalid Dakhsi,
  • Mohamed Ebn Touhami,
  • El Hassan El Kafssaoui

摘要

To enhance the electrochemical performance of a Ni-ZnO composite electrodeposited onto indium tin oxide (ITO) glass for supercapacitor applications, we incorporated MnO₂ in three incremental stages to elaborate a ZnO/Ni/MnO₂ hybrid composite. The addition of MnO₂ introduced a significant synergistic effect with the ZnO/Ni framework, resulting in a marked improvement in the composite’s performance, particularly achieving an operational potential beyond 0.7 V versus the standard calomel electrode (SCE) and an increase in effective surface area. The ZnO-Ni-MnO₂ composite was thoroughly characterized to understand its structure and electrochemical behavior. X-ray diffraction (XRD) analysis confirmed the distinct crystalline phases of ZnO, Ni, and MnO₂, indicating successful integration. Scanning electron microscopy (SEM) revealed a unique blackberry-like morphology in the material, which is highly favorable for supercapacitor applications due to the increased surface area and porous structure, promoting efficient ion diffusion and charge storage. Energy-dispersive X-ray spectroscopy (EDS) verified the elemental composition and uniform dispersion of MnO₂ within the ZnO-Ni matrix, further validating the composite’s homogeneity. Electrochemical impedance spectroscopy (EIS) demonstrated an enhanced charge transfer capability with the incorporation of MnO₂, as reflected by a reduction in charge transfer resistance, indicative of improved conductivity and faster ion dynamics within the composite. Cyclic voltammetry (CV) tests conducted at a 10 mV/s scan rate in a 0.5 M Na₂SO₄ aqueous electrolyte, over a voltage window from 0 to 0.85 V, showcased the ZnO-Ni-MnO₂ composite’s high specific capacitance of 251.3 F/g at a current density of 0.3 A/g. Notably, this performance was achieved without the use of additional binders or conductive additives, a significant advantage for practical applications.