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<p>The urgent need for sustainable energy drives the search for efficient hydrogen production via water electrolysis, yet the oxygen evolution reaction (OER) remains hindered by slow kinetics and dependence on scarce, expensive noble-metal catalysts. To address this, we explore transition metal-doped manganese oxides (Mn<sub>3</sub>O<sub>4</sub>) as low-cost, stable alternatives. In this work, Fe-doped Mn<sub>3</sub>O<sub>4</sub> catalysts are synthesized through electrochemical deposition followed by air annealing, which successfully incorporates Fe into the Mn<sub>3</sub>O<sub>4</sub> lattice. The introduced Fe optimizes the electronic structure and increases the density of active sites, leading to enhance OER performance. The resulting Fe-Mn<sub>3</sub>O<sub>4</sub> catalyst demonstrates remarkable activity, with an overpotential as low as 306&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> and a Tafel slope of 68&#xa0;mV&#xa0;dec<sup>−1</sup>, alongside long-term stability in alkaline media. This work establishes Fe-doped Mn<sub>3</sub>O<sub>4</sub> as a promising, cost-effective catalyst platform, contributing to the development of practical and efficient hydrogen production technologies.</p>

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Fe-Doped Mn3O4 Spinel Nanostructures for Enhanced Alkaline Oxygen Evolution Reaction via Electrodeposition

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Shuqing Xu,
  • Tongyan Zhang,
  • Shuaifei Su,
  • Sisi Xu,
  • Yuanyuan Li,
  • Yang Song,
  • Feiyong Chen

摘要

The urgent need for sustainable energy drives the search for efficient hydrogen production via water electrolysis, yet the oxygen evolution reaction (OER) remains hindered by slow kinetics and dependence on scarce, expensive noble-metal catalysts. To address this, we explore transition metal-doped manganese oxides (Mn3O4) as low-cost, stable alternatives. In this work, Fe-doped Mn3O4 catalysts are synthesized through electrochemical deposition followed by air annealing, which successfully incorporates Fe into the Mn3O4 lattice. The introduced Fe optimizes the electronic structure and increases the density of active sites, leading to enhance OER performance. The resulting Fe-Mn3O4 catalyst demonstrates remarkable activity, with an overpotential as low as 306 mV at 10 mA cm−2 and a Tafel slope of 68 mV dec−1, alongside long-term stability in alkaline media. This work establishes Fe-doped Mn3O4 as a promising, cost-effective catalyst platform, contributing to the development of practical and efficient hydrogen production technologies.