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<p>The successful development of low-cost, high-efficiency, and environmentally friendly catalysts is necessary to advance next-generation fuel cells and electrochemical energy systems. This work focused on the investigation of a naturally occurring mica mineral, known <b>as</b> phlogopite, as a catalyst for the electrooxidation of hydrazine and hydrogen peroxide in an alkaline electrolyte, with the aim of finding an earth-abundant catalyst for these reactions. The X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy analyses confirmed the layered crystalline structure of phlogopite with high crystallinity. The electrochemical performance was systematically studied by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The catalyst was very active in the oxidation of hydrazine, giving a current density of 57.76&#xa0;mA cm<sup>-2</sup>, and also showed high activity for the oxidation of hydrogen peroxide, with a current density of 46.95&#xa0;mA cm<sup>-2</sup>. The moderate HOMO-LUMO energy gap of 7.782&#xa0;eV and the balanced electrostatic potential distribution were found to play a major role in the catalytic activity and stability of the phlogopite structure based on DFT calculations. These results showed that phlogopite could be considered a novel resource for clean electrochemical energy conversion compared with precious metal-based catalysts.</p> Graphical abstract <p></p>

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Phlogopite for alkaline hydrazine and hydrogen peroxide electrooxidation

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Bassam A. Najri,
  • Katia Mohand Saidi,
  • Özgür Karaoğlu,
  • Sefika Kaya,
  • Elif Varol Muratçay,
  • Işıl Tokcan,
  • Arif Kivrak,
  • Hilal Kivrak

摘要

The successful development of low-cost, high-efficiency, and environmentally friendly catalysts is necessary to advance next-generation fuel cells and electrochemical energy systems. This work focused on the investigation of a naturally occurring mica mineral, known as phlogopite, as a catalyst for the electrooxidation of hydrazine and hydrogen peroxide in an alkaline electrolyte, with the aim of finding an earth-abundant catalyst for these reactions. The X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy analyses confirmed the layered crystalline structure of phlogopite with high crystallinity. The electrochemical performance was systematically studied by cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The catalyst was very active in the oxidation of hydrazine, giving a current density of 57.76 mA cm-2, and also showed high activity for the oxidation of hydrogen peroxide, with a current density of 46.95 mA cm-2. The moderate HOMO-LUMO energy gap of 7.782 eV and the balanced electrostatic potential distribution were found to play a major role in the catalytic activity and stability of the phlogopite structure based on DFT calculations. These results showed that phlogopite could be considered a novel resource for clean electrochemical energy conversion compared with precious metal-based catalysts.

Graphical abstract