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<p>The fabrication of reliable and highly efficient electrocatalysts for water electrolysis poses a significant challenge in fulfilling the energy demand. In the present work, a hybrid electrocatalyst of manganese ferrite and rGO is fabricated for OER. The MnFe<sub>2</sub>O<sub>4</sub>@rGO composite was synthesised by a hydrothermal approach, where MnFe<sub>2</sub>O<sub>4</sub> nanoparticles were prepared and then integrated with reduced graphene sheets (rGO). The morphological and structural properties of MnFe<sub>2</sub>O<sub>4</sub>, rGO, and MnFe<sub>2</sub>O<sub>4</sub>@rGO were studied using different physicochemical techniques. The 3-electrode study under alkaline (1.0 M KOH) conditions was conducted to estimate the electrochemistry of the material. The synthesised composite exhibited an overpotential of 239.2 mV at (10 mA/cm<sup>2</sup>) current density. The electrocatalysts showed high transfer of electrons with a Tafel value of 39.7 mV/dec. Moreover, the stability test showed that the material can withstand 40 h. The impedance test also confirmed that the composite has low resistance and high conductivity. The synergetic effect of rGO and manganese ferrites helps attain high conductivity. All the electrochemical results confirmed that the fabricated MnFe<sub>2</sub>O<sub>4</sub>@rGO composite could be used in place of noble metals as suitable and effective electrocatalysts.</p><p></p>

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Physiochemical study of MnFe2O4@rGO composite for enhanced OER activity

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Muhammad Umair,
  • Muhammad Miqdad Hassan,
  • B. M. Alotaibi,
  • Haifa A. Alyousef,
  • Albandari W. Alrowaily,
  • Abdullah G. Al -Sehemi,
  • Kiran Tahir

摘要

The fabrication of reliable and highly efficient electrocatalysts for water electrolysis poses a significant challenge in fulfilling the energy demand. In the present work, a hybrid electrocatalyst of manganese ferrite and rGO is fabricated for OER. The MnFe2O4@rGO composite was synthesised by a hydrothermal approach, where MnFe2O4 nanoparticles were prepared and then integrated with reduced graphene sheets (rGO). The morphological and structural properties of MnFe2O4, rGO, and MnFe2O4@rGO were studied using different physicochemical techniques. The 3-electrode study under alkaline (1.0 M KOH) conditions was conducted to estimate the electrochemistry of the material. The synthesised composite exhibited an overpotential of 239.2 mV at (10 mA/cm2) current density. The electrocatalysts showed high transfer of electrons with a Tafel value of 39.7 mV/dec. Moreover, the stability test showed that the material can withstand 40 h. The impedance test also confirmed that the composite has low resistance and high conductivity. The synergetic effect of rGO and manganese ferrites helps attain high conductivity. All the electrochemical results confirmed that the fabricated MnFe2O4@rGO composite could be used in place of noble metals as suitable and effective electrocatalysts.