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<p>The creation of effective and affordable water oxidation catalysts is a major obstacle to enhance the performance of large-scale energy solutions based on electricity-driven hydrogen generation from water. Significant attempts were made to increase the catalytic efficiency of electrocatalysts derived from 3D-transition metals, particularly those based on cobalt, which are seen to be viable options for non-noble catalysts in electrocatalytic water splitting. In the present article, we have synthesized various stoichiometries of cobalt tungstate via a one-pot hydrothermal method. The prepared catalysts were then thoroughly characterized by X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and X-ray photoelectron spectroscopy (XPS). Afterwards, electrochemical studies like linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization analysis were done to test the potential of the electrocatalysts for the oxygen evolution reaction (OER) in a basic environment. Among the various stoichiometries, the lowest overpotential was found to be 220&#xa0;mV for CoWO<sub>4</sub> to provide 10&#xa0;mA&#xa0;cm<sup>−2</sup>&#xa0;current density (<i>η</i><sub>10</sub>), which is better than the benchmarking IrO<sub>2</sub> (313&#xa0;mV). Further, it has the lowest <i>R</i><sub>ct</sub> and Tafel slope of 56 Ω and 75&#xa0;mV dec<sup>−1</sup>, respectively, among other prepared catalysts.</p>

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Investigating the Electrochemical Performance of Cobalt Tungstate CoxW2-xO4; x = 0.5, 1.0, 1.5 Catalysts for Alkaline Water Oxidation: Tailoring Composition for Optimal Activity

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Sarvatej Kumar Maurya,
  • Amisha Soni,
  • Manisha Malviya,
  • Dhanesh Tiwary

摘要

The creation of effective and affordable water oxidation catalysts is a major obstacle to enhance the performance of large-scale energy solutions based on electricity-driven hydrogen generation from water. Significant attempts were made to increase the catalytic efficiency of electrocatalysts derived from 3D-transition metals, particularly those based on cobalt, which are seen to be viable options for non-noble catalysts in electrocatalytic water splitting. In the present article, we have synthesized various stoichiometries of cobalt tungstate via a one-pot hydrothermal method. The prepared catalysts were then thoroughly characterized by X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), and X-ray photoelectron spectroscopy (XPS). Afterwards, electrochemical studies like linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization analysis were done to test the potential of the electrocatalysts for the oxygen evolution reaction (OER) in a basic environment. Among the various stoichiometries, the lowest overpotential was found to be 220 mV for CoWO4 to provide 10 mA cm−2 current density (η10), which is better than the benchmarking IrO2 (313 mV). Further, it has the lowest Rct and Tafel slope of 56 Ω and 75 mV dec−1, respectively, among other prepared catalysts.