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<p>The integration of perovskite oxide with carbon-based materials has emerged as an effective strategy to enhance hydrogen evolution reaction (HER). BaTiO<sub>3</sub> exhibits significant potential for electrochemical applications due to its unique functional properties and tunability; howsoever, its poor intrinsic electrical conductivity limits its standalone performance in electrocatalysis. Therefore, BaTiO<sub>3</sub> is combined with graphene oxide-based materials to overcome its limited electrical conductivity and to enhance its overall electrochemical performance. BaTiO<sub>3</sub> is combined with GO by varying the weight percentages (1, 3, and 5%) to systematically investigate its influence on electrochemical performance. Therefore, this research aims to exploit the synergistic characteristics of BaTiO<sub>3</sub>–GO heterostructure composites for hydrogen evolution reactions. The designed BaTiO<sub>3</sub>-5% of GO (B5R) mixture among the prepared specimens showed remarkable catalytic activity with a very low overpotential of 174&#xa0;mV at 10&#xa0;mA&#xa0;cm⁻<sup>2</sup>. The sample B5R also presents a low Tafel slope of 87&#xa0;mV dec⁻<sup>1</sup>, indicating that the reaction kinetics have been boosted to a greater extent and also that the charge transfer is more efficient. Electrochemical impedance spectroscopy demonstrates that the incorporation of GO significantly influences the charge-transfer resistance, with B3R (3% of GO) exhibiting lowest resistance. The Raman and XPS measurements demonstrate the transferability of charges between BaTiO<sub>3</sub> and its corresponding oxidation state. This is attributed to synergistic effects, such as increased electrical conductivity from the composite, more active sites, and better interactions between the two materials. Based on the results, BaTiO<sub>3</sub>/GO composites are found to be promising and cost-effective catalyst for hydrogen evolution activity.</p>

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Electrocatalytic water splitting performance of BaTiO3/GO composite for hydrogen evolution reaction

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Leena Baskar,
  • Divyadharshini Satheesh,
  • Paul Joseph Daniel,
  • Kovendhan Manavalan

摘要

The integration of perovskite oxide with carbon-based materials has emerged as an effective strategy to enhance hydrogen evolution reaction (HER). BaTiO3 exhibits significant potential for electrochemical applications due to its unique functional properties and tunability; howsoever, its poor intrinsic electrical conductivity limits its standalone performance in electrocatalysis. Therefore, BaTiO3 is combined with graphene oxide-based materials to overcome its limited electrical conductivity and to enhance its overall electrochemical performance. BaTiO3 is combined with GO by varying the weight percentages (1, 3, and 5%) to systematically investigate its influence on electrochemical performance. Therefore, this research aims to exploit the synergistic characteristics of BaTiO3–GO heterostructure composites for hydrogen evolution reactions. The designed BaTiO3-5% of GO (B5R) mixture among the prepared specimens showed remarkable catalytic activity with a very low overpotential of 174 mV at 10 mA cm⁻2. The sample B5R also presents a low Tafel slope of 87 mV dec⁻1, indicating that the reaction kinetics have been boosted to a greater extent and also that the charge transfer is more efficient. Electrochemical impedance spectroscopy demonstrates that the incorporation of GO significantly influences the charge-transfer resistance, with B3R (3% of GO) exhibiting lowest resistance. The Raman and XPS measurements demonstrate the transferability of charges between BaTiO3 and its corresponding oxidation state. This is attributed to synergistic effects, such as increased electrical conductivity from the composite, more active sites, and better interactions between the two materials. Based on the results, BaTiO3/GO composites are found to be promising and cost-effective catalyst for hydrogen evolution activity.