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Rhombohedral Fe2O3/LaCoO3 nanomaterials as high-performance electrocatalysts for OER: Synthesis and electrochemical performance.

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Title: Rhombohedral Fe2O3/LaCoO3 nanomaterials as high-performance electrocatalysts for OER: Synthesis and electrochemical performance.
Authors: Alharbi, Nouf1, Burman, Vishal2, Khan, Mahvish3,4, Adam, Hajer1, Srivastava, Manish5, Haque, Shafiul6,7, Bhagwath, Sundeep S.4,8, Punnoose, Kurian4,9, Shariq, Mohammad1 aligshariq@gmail.com
Source: Molecular Catalysis. Jun2025, Vol. 580, pN.PAG-N.PAG. 1p.
Subjects: Iron oxides, Oxygen evolution reactions, Coprecipitation (Chemistry), Electrocatalysts, Nanostructured materials, Electrochemistry
Abstract: • Rhombohedral composite nanomaterial (Fe 2 O 3 /LaCoO 3) was synthesized by the coprecipitation method. • The binary electrocatalyst shows termendous activity and stability for oxygen evolution reactions. • The obtained binary catalyst achieves impressively low overpotentials of 311 mV to achieve the current density of 10 mA/cm2 (η 10), along with Tafel slopes of 76 in alkaline media. • Under alkaline conditions, it demonstrates outstanding durability, sustaining activity for OER. • The enhanced electrocatalytic performance may be due to the synergetic effect among La, CoO 3 , and Fe 2 O 3 , which typically improves the overpotential, charge-mass transport, and stability. The development of stable, non-noble, and sustainable nanomaterials offers a viable pathway for enhancing water electrolysis operations, especially in facilitating efficient Oxygen Evolution Reaction (OER). In this study, we have prepared a rhombohedral composite nanomaterial (Fe 2 O 3 /LaCoO 3) for the OER by co-precipitation method. Samples were thoroughly analyzed using multiple techniques to ensure comprehensive characterization, including X-Ray Diffraction (XRD) for crystallographic structure determination, Scanning Electron Microscopy (SEM) for surface morphology observation, Energy Dispersive X-ray Spectroscopy (EDX) for elemental composition analysis, mapping analysis to visualize spatial distribution of elements, and Fourier Transform Infrared Spectroscopy (FTIR) for identifying functional groups and chemical bonds. Prepared electrocatalyst reveals robust OER performance with an overpotential of 311 mV to achieve the 10 mAcm−2 current density in alkaline media. Significantly, this catalyst offers a low Tafel slope of 76 mV dec‑1 and a charge transfer resistance of 532 Ω with excellent Linear Sweep Voltammetry (LSV) cycling stability. The improved electrocatalytic performance results from the synergistic interaction among La, CoO 3 , and Fe 2 O 3 , which typically enhances the overpotential, charge-mass transport, and stability. This strategy offers a viable pathway for synthesizing and optimizing nanomaterials for advanced electrochemistry. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Molecular Catalysis is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Rhombohedral Fe2O3/LaCoO3 nanomaterials as high-performance electrocatalysts for OER: Synthesis and electrochemical performance.
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  Data: <searchLink fieldCode="AR" term="%22Alharbi%2C+Nouf%22">Alharbi, Nouf</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burman%2C+Vishal%22">Burman, Vishal</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Khan%2C+Mahvish%22">Khan, Mahvish</searchLink><relatesTo>3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Adam%2C+Hajer%22">Adam, Hajer</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Srivastava%2C+Manish%22">Srivastava, Manish</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Haque%2C+Shafiul%22">Haque, Shafiul</searchLink><relatesTo>6,7</relatesTo><br /><searchLink fieldCode="AR" term="%22Bhagwath%2C+Sundeep+S%2E%22">Bhagwath, Sundeep S.</searchLink><relatesTo>4,8</relatesTo><br /><searchLink fieldCode="AR" term="%22Punnoose%2C+Kurian%22">Punnoose, Kurian</searchLink><relatesTo>4,9</relatesTo><br /><searchLink fieldCode="AR" term="%22Shariq%2C+Mohammad%22">Shariq, Mohammad</searchLink><relatesTo>1</relatesTo><i> aligshariq@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Molecular+Catalysis%22">Molecular Catalysis</searchLink>. Jun2025, Vol. 580, pN.PAG-N.PAG. 1p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Rhombohedral composite nanomaterial (Fe 2 O 3 /LaCoO 3) was synthesized by the coprecipitation method. • The binary electrocatalyst shows termendous activity and stability for oxygen evolution reactions. • The obtained binary catalyst achieves impressively low overpotentials of 311 mV to achieve the current density of 10 mA/cm2 (η 10), along with Tafel slopes of 76 in alkaline media. • Under alkaline conditions, it demonstrates outstanding durability, sustaining activity for OER. • The enhanced electrocatalytic performance may be due to the synergetic effect among La, CoO 3 , and Fe 2 O 3 , which typically improves the overpotential, charge-mass transport, and stability. The development of stable, non-noble, and sustainable nanomaterials offers a viable pathway for enhancing water electrolysis operations, especially in facilitating efficient Oxygen Evolution Reaction (OER). In this study, we have prepared a rhombohedral composite nanomaterial (Fe 2 O 3 /LaCoO 3) for the OER by co-precipitation method. Samples were thoroughly analyzed using multiple techniques to ensure comprehensive characterization, including X-Ray Diffraction (XRD) for crystallographic structure determination, Scanning Electron Microscopy (SEM) for surface morphology observation, Energy Dispersive X-ray Spectroscopy (EDX) for elemental composition analysis, mapping analysis to visualize spatial distribution of elements, and Fourier Transform Infrared Spectroscopy (FTIR) for identifying functional groups and chemical bonds. Prepared electrocatalyst reveals robust OER performance with an overpotential of 311 mV to achieve the 10 mAcm−2 current density in alkaline media. Significantly, this catalyst offers a low Tafel slope of 76 mV dec‑1 and a charge transfer resistance of 532 Ω with excellent Linear Sweep Voltammetry (LSV) cycling stability. The improved electrocatalytic performance results from the synergistic interaction among La, CoO 3 , and Fe 2 O 3 , which typically enhances the overpotential, charge-mass transport, and stability. This strategy offers a viable pathway for synthesizing and optimizing nanomaterials for advanced electrochemistry. [Display omitted] [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Molecular Catalysis is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.mcat.2025.115124
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Iron oxides
        Type: general
      – SubjectFull: Oxygen evolution reactions
        Type: general
      – SubjectFull: Coprecipitation (Chemistry)
        Type: general
      – SubjectFull: Electrocatalysts
        Type: general
      – SubjectFull: Nanostructured materials
        Type: general
      – SubjectFull: Electrochemistry
        Type: general
    Titles:
      – TitleFull: Rhombohedral Fe2O3/LaCoO3 nanomaterials as high-performance electrocatalysts for OER: Synthesis and electrochemical performance.
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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