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<p>In this work, LaFe<sub>0.5</sub>Co<sub>0.5</sub>O<sub>3−δ</sub> perovskite was prepared by the sol-gel method. X-ray diffraction (XRD) pattern showed that the sample exhibits a rhombohedral (R3c) crystal structure. Transmission electron microscopy (TEM) image of the sample revealed polyhedron structures of various sizes. Detailed analysis of high-resolution TEM image and selected area electron diffraction (SAED) pattern supported the rhombohedral phase formation and confirmed the polycrystalline nature of LaFe<sub>0.5</sub>Co<sub>0.5</sub>O<sub>3−δ</sub> perovskite. The elemental composition of the prepared sample was analyzed by a combination of energy dispersive X-ray spectroscopy (EDS) and EDS elemental mapping. Additionally, surface area and average pore size of 2.7247 m<sup>2</sup>/g and 36.356&#xa0;nm, respectively, were determined from Nitrogen (N<sub>2</sub>) adsorption-desorption isotherm. X-ray photoelectron spectroscopy (XPS) performed for the sample showed the existence of oxygen vacancies and mixed valence states of Fe<sup>2+</sup>/Fe<sup>3+</sup> and Co<sup>2+</sup>/Co<sup>3+</sup>. The investigated LaFe<sub>0.5</sub>Co<sub>0.5</sub>O<sub>3−δ</sub> perovskite sample was found to pose a direct band gap energy (E<sub>g</sub>) of 1.25&#xa0;eV, as deduced from diffuse UV-visible reflectance data. Electrochemical results showed that the perovskite sample exhibits pseudocapacitive behavior and that the charge storing in LaFe<sub>0.5</sub>Co<sub>0.5</sub>O<sub>3−δ</sub> electrode is primely facilitated through oxygen intercalation mechanism.</p>

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Structural, optical, and electrochemical properties of LaFe0.5Co0.5O3−δ perovskite

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Abdullah Almohammedi,
  • Yasser A. M. Ismail,
  • E. K. Abdel-Khalek

摘要

In this work, LaFe0.5Co0.5O3−δ perovskite was prepared by the sol-gel method. X-ray diffraction (XRD) pattern showed that the sample exhibits a rhombohedral (R3c) crystal structure. Transmission electron microscopy (TEM) image of the sample revealed polyhedron structures of various sizes. Detailed analysis of high-resolution TEM image and selected area electron diffraction (SAED) pattern supported the rhombohedral phase formation and confirmed the polycrystalline nature of LaFe0.5Co0.5O3−δ perovskite. The elemental composition of the prepared sample was analyzed by a combination of energy dispersive X-ray spectroscopy (EDS) and EDS elemental mapping. Additionally, surface area and average pore size of 2.7247 m2/g and 36.356 nm, respectively, were determined from Nitrogen (N2) adsorption-desorption isotherm. X-ray photoelectron spectroscopy (XPS) performed for the sample showed the existence of oxygen vacancies and mixed valence states of Fe2+/Fe3+ and Co2+/Co3+. The investigated LaFe0.5Co0.5O3−δ perovskite sample was found to pose a direct band gap energy (Eg) of 1.25 eV, as deduced from diffuse UV-visible reflectance data. Electrochemical results showed that the perovskite sample exhibits pseudocapacitive behavior and that the charge storing in LaFe0.5Co0.5O3−δ electrode is primely facilitated through oxygen intercalation mechanism.