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<p>The oxygen evolution reaction (OER) is a critical half-reaction in electrochemical water splitting, necessitating the development of efficient and cost-effective electrocatalysts. SrCoO<sub>3</sub> perovskite is a promising candidate owing to its excellent electronic conductivity and catalytic activity. To enhance its performance, we synthesized a series of doped perovskites, SrCo<sub>0.6</sub> × <sub>0.4</sub>O<sub>3</sub> (X = Mn, Ni, Cu, Fe), denoted as SCM, SCN, SCC, and SCF, using the sol-gel method. Structural characterization via X-ray diffraction (XRD) revealed crystallite Sizes ranging from 40.77 to 56.89&#xa0;nm. Rietveld refinement showed that SCM, SCN, and SCC crystallized in a hexagonal phase, while SCF exhibited a cubic structure. Raman and FTIR spectroscopy confirmed the vibrational modes and structural integrity of the materials. FESEM imaging displayed distinct morphological differences, with SCF showing larger aggregates and a rougher surface, potentially offering more active Sites. Among all samples, SCF demonstrated better OER activity, requiring an overpotential of only 1.04&#xa0;V at 10&#xa0;mA cm<sup>−2</sup> and exhibiting the lowest Tafel slope. These results suggest SCF as a highly promising and economical electrocatalyst for water-splitting applications.</p>

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Impact of Transition Metal Doping on the Structural and Electrochemical Properties of SrCoO3 Perovskites for OER Applications

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Rohit Kumar,
  • Samriti Mehta,
  • Rajni Thakur,
  • R. Shwetharani,
  • Sumanth S. Dongre,
  • Sahil Kumar,
  • Itika Kainthla

摘要

The oxygen evolution reaction (OER) is a critical half-reaction in electrochemical water splitting, necessitating the development of efficient and cost-effective electrocatalysts. SrCoO3 perovskite is a promising candidate owing to its excellent electronic conductivity and catalytic activity. To enhance its performance, we synthesized a series of doped perovskites, SrCo0.6 × 0.4O3 (X = Mn, Ni, Cu, Fe), denoted as SCM, SCN, SCC, and SCF, using the sol-gel method. Structural characterization via X-ray diffraction (XRD) revealed crystallite Sizes ranging from 40.77 to 56.89 nm. Rietveld refinement showed that SCM, SCN, and SCC crystallized in a hexagonal phase, while SCF exhibited a cubic structure. Raman and FTIR spectroscopy confirmed the vibrational modes and structural integrity of the materials. FESEM imaging displayed distinct morphological differences, with SCF showing larger aggregates and a rougher surface, potentially offering more active Sites. Among all samples, SCF demonstrated better OER activity, requiring an overpotential of only 1.04 V at 10 mA cm−2 and exhibiting the lowest Tafel slope. These results suggest SCF as a highly promising and economical electrocatalyst for water-splitting applications.