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<p>Energy storage has become an essential need for today’s applications. Thus, the development of capacitors and their materials has gotten great attention. In this study, a high mass loading (2&#xa0;mg&#xa0;cm<sup>−2</sup>) NiMn<sub>2</sub>O<sub>4</sub>/carbon felt (CF-NMO) was fabricated using a hydrothermal process and used as a new material for a pseudo-capacitive electrode having a potential window of 0.65&#xa0;V. Several analytical techniques were employed to confirm the structure, such as X-ray diffraction (XRD), and X-ray photon spectroscopy (XPS). The spinel oxide distribution and surface morphology were studied using scanning electron microscopy (SEM), and transmitted electron microscopy (TEM). The activity of the modified CF-NMO was investigated in 1.0&#xa0;M NaOH. The prepared electrode reached a capacitance of 301 F g<sup>−1</sup> at the current density of 1&#xa0;mA&#xa0;g<sup>−1</sup>. Furthermore, the electrode’s durability was investigated for 2000 cycles at 5&#xa0;mA&#xa0;g<sup>−1</sup>, and the provided capacitance retention was ~ 85% compared to the 1st cycle. Also, the rate capability was estimated to be 69% in the current range from 1 to 5&#xa0;mA&#xa0;cm<sup>−2</sup>.</p> Graphical Abstract <p></p>

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Synthesis of Nickel-Manganese Spinel Oxide Supported on Carbon-Felt Surface to Enhance Electrochemical Capacitor Performance

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Mahmoud A. Hefnawy,
  • Rewaida Abdel-Gaber,
  • Sobhi M. Gomha,
  • Magdi E. A. Zaki,
  • Shymaa S. Medany

摘要

Energy storage has become an essential need for today’s applications. Thus, the development of capacitors and their materials has gotten great attention. In this study, a high mass loading (2 mg cm−2) NiMn2O4/carbon felt (CF-NMO) was fabricated using a hydrothermal process and used as a new material for a pseudo-capacitive electrode having a potential window of 0.65 V. Several analytical techniques were employed to confirm the structure, such as X-ray diffraction (XRD), and X-ray photon spectroscopy (XPS). The spinel oxide distribution and surface morphology were studied using scanning electron microscopy (SEM), and transmitted electron microscopy (TEM). The activity of the modified CF-NMO was investigated in 1.0 M NaOH. The prepared electrode reached a capacitance of 301 F g−1 at the current density of 1 mA g−1. Furthermore, the electrode’s durability was investigated for 2000 cycles at 5 mA g−1, and the provided capacitance retention was ~ 85% compared to the 1st cycle. Also, the rate capability was estimated to be 69% in the current range from 1 to 5 mA cm−2.

Graphical Abstract