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<p>Synthesis technology is proposed to produce new hybrid composites based on graphitic carbon nitride and partially unzipped multi-walled carbon nanotubes. Different compositions of initial materials were tested for the synthesis of the hybrid composites, namely, different amounts of urea/melamine mixture as a carbon nitride source, as well as partially unzipped multi-walled carbon nanotubes treated or not treated with HNO<sub>3</sub>. The obtained hybrid composites were characterized by XRD, TEM, Raman, and FT-IR spectroscopy. The composites were applied as electrode materials for oxygen electrodes of power sources with an alkaline electrolyte. It was found that as oxygen electrode cathode material, composites prepared with carbon nitride and HNO<sub>3</sub>-treated partially unzipped carbon nanotubes demonstrated better characteristics compared to other carbon nitride-based compositions. This can be explained by the appearance of additional nitrogen-containing groups in the material. Electrochemical studies have established that new composites are promising materials as a metal-free catalyst for oxygen electrodes being stable over a 6-month operation in a fuel half-cell.</p> Graphical abstract <p></p>

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g-C3N4–HNO3-treated partially unzipped carbon nanotubes hybrid composites for oxygen electrodes of alkaline fuel cells

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Michail O. Danilov,
  • Galyna I. Dovbeshko,
  • Vitaly V. Boiko,
  • Igor A. Rusetskyi,
  • Olena P. Gnatyuk,
  • Ieugene V. Gubareni,
  • Oleksii S. Bezkrovnyi,
  • Sergii St. Fomanyuk,
  • Gennady Ya. Kolbasov

摘要

Synthesis technology is proposed to produce new hybrid composites based on graphitic carbon nitride and partially unzipped multi-walled carbon nanotubes. Different compositions of initial materials were tested for the synthesis of the hybrid composites, namely, different amounts of urea/melamine mixture as a carbon nitride source, as well as partially unzipped multi-walled carbon nanotubes treated or not treated with HNO3. The obtained hybrid composites were characterized by XRD, TEM, Raman, and FT-IR spectroscopy. The composites were applied as electrode materials for oxygen electrodes of power sources with an alkaline electrolyte. It was found that as oxygen electrode cathode material, composites prepared with carbon nitride and HNO3-treated partially unzipped carbon nanotubes demonstrated better characteristics compared to other carbon nitride-based compositions. This can be explained by the appearance of additional nitrogen-containing groups in the material. Electrochemical studies have established that new composites are promising materials as a metal-free catalyst for oxygen electrodes being stable over a 6-month operation in a fuel half-cell.

Graphical abstract