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<p>The formation of nanoscale composites of Mn oxides and carbonaceous materials doped with Fe and N (Fe-N-C) was achieved by the sublimation, deposition, and pyrolysis of iron phthalocyanine (FePc) on multi-walled carbon nanotubes (MWCNTs), followed by hydrothermal treatment in aqueous solutions of Mn salts, to investigate the interaction between the components as a quasi-practical catalyst for the oxygen evolution reaction (OER). Nanoparticle, needle-like, and overlapped flake-like Mn oxides were obtained, depending on the Mn precursor concentration and whether the Fe-N-C thin film was coated. The X-ray absorption fine structures of the composite showed that the FePc central structure, that is, Fe coordinated with four N in a square planar configuration, was retained, and that the Mn nano-oxides mainly consisted of MnO<sub>2</sub>. The OER current at the composite increased with increasing Mn nano-oxide loading, reached a maximum, and exceeded the current at the MWCNT with either component, indicating a synergistic effect of the Fe-N-C thin film and Mn nano-oxides on the OER in the nanoscale catalyst.</p> Graphical Abstract <p></p>

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Synergies between Mn nano-oxides and Fe-N-C-coated carbon nanotubes as oxygen evolution catalysts

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Jun Maruyama,
  • Shohei Maruyama,
  • Setsuko Shibuya,
  • Yoshiyuki Nonoguchi,
  • Zyun Siroma,
  • Kazuhide Kamiya

摘要

The formation of nanoscale composites of Mn oxides and carbonaceous materials doped with Fe and N (Fe-N-C) was achieved by the sublimation, deposition, and pyrolysis of iron phthalocyanine (FePc) on multi-walled carbon nanotubes (MWCNTs), followed by hydrothermal treatment in aqueous solutions of Mn salts, to investigate the interaction between the components as a quasi-practical catalyst for the oxygen evolution reaction (OER). Nanoparticle, needle-like, and overlapped flake-like Mn oxides were obtained, depending on the Mn precursor concentration and whether the Fe-N-C thin film was coated. The X-ray absorption fine structures of the composite showed that the FePc central structure, that is, Fe coordinated with four N in a square planar configuration, was retained, and that the Mn nano-oxides mainly consisted of MnO2. The OER current at the composite increased with increasing Mn nano-oxide loading, reached a maximum, and exceeded the current at the MWCNT with either component, indicating a synergistic effect of the Fe-N-C thin film and Mn nano-oxides on the OER in the nanoscale catalyst.

Graphical Abstract