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<p>Carbon- and transition-materials-based materials offer promising opportunities for developing efficient and cost effective OER electrocatalysts. The MgFe<sub>2</sub>O<sub>4</sub>/rGO hybrid was formulated through a simple hydrothermal method using earth abundant elements and exhibits high activity and durability. XRD confirms the formation of cubic MgFe<sub>2</sub>O<sub>4</sub> with reduced graphene oxide, while microscopy reveals uniformly distributed nanoparticles on rGO sheets, promoting strong metal-carbon interactions. The optimized catalyst delivers an over potential of 241 mV with a Tafel 41.4 mV/dec in one molar potassium hydroxide electrolyte, along with a high ECSA (1250 cm<sup>2</sup>), low charge transfer resistance (0.95 Ω), and stable operation for 25&#xa0;h. These results demonstrate an effective economic strategy for OER catalysis using dual-metal oxide/rGO nanocomposite.</p>

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Efficient oxygen evolution reaction (OER) electrocatalysis by MgFe2O4@rGO nanocomposites

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Haifa A. Alyousef,
  • Muhammad Haroon,
  • B. M. Alotaibi,
  • Albandari W. Alrowaily,
  • Hala M. Abo-Dief,
  • Abhinav Kumar

摘要

Carbon- and transition-materials-based materials offer promising opportunities for developing efficient and cost effective OER electrocatalysts. The MgFe2O4/rGO hybrid was formulated through a simple hydrothermal method using earth abundant elements and exhibits high activity and durability. XRD confirms the formation of cubic MgFe2O4 with reduced graphene oxide, while microscopy reveals uniformly distributed nanoparticles on rGO sheets, promoting strong metal-carbon interactions. The optimized catalyst delivers an over potential of 241 mV with a Tafel 41.4 mV/dec in one molar potassium hydroxide electrolyte, along with a high ECSA (1250 cm2), low charge transfer resistance (0.95 Ω), and stable operation for 25 h. These results demonstrate an effective economic strategy for OER catalysis using dual-metal oxide/rGO nanocomposite.