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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]
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Database: Engineering Source
Description
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]
ISSN:24688231
DOI:10.1016/j.mcat.2025.115124