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<p>Significant efforts have been focused on the development of non-noble metal electrocatalysts for efficient production of green hydrogen using renewable energy sources such as water and sunlight. Various transition metal oxides have been explored as promising candidates for hydrogen evolution reactions (HER), attracting considerable attention in the field of water splitting. In this study, we report the synthesis of anatase phase TiO<sub>2</sub> nanoparticles (NPs) with a crystallite size of 6.94&#xa0;nm, achieved through a co-precipitation method specifically for neutral water electrochemical HER applications. The as-synthesized anatase phase of TiO<sub>2</sub> electrocatalyst have been characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and ultraviolet visible spectroscopy. Transmission electron microscopy analysis revealed that the average particle size of the TiO<sub>2</sub> NPs was approximately 5.80&#xa0;nm. The exceptional HER performance of these nanoparticles can be attributed to their optimal crystallite size, rapid charge transfer kinetics, and reduced band gap energy. The electrocatalyst demonstrated an overpotential of 470&#xa0;mV to achieve a current density of 10&#xa0;mA cm<sup>−2</sup> in a 0.2&#xa0;M Na<sub>2</sub>SO<sub>4</sub> electrolyte. Furthermore, the electrode maintained stable HER activity over a continuous period of 50&#xa0;h, indicating its potential for practical applications. These findings highlight the critical role of crystallite size optimization in enhancing HER activity, particularly in neutral electrolytes. By advancing the understanding of non-noble metal electrocatalysts, this study contributes to the ongoing efforts to develop efficient, sustainable methods for green hydrogen production, aligning with global goals for renewable energy utilization.</p>

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Efficient hydrogen evolution via neutral water electrolysis using nanocrystalline TiO2 electrocatalyst

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月8日

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  • Prashant D. Sanadi,
  • Rajvardhan K. Chougale,
  • Dhanaji B. Malavekar,
  • Jin Hyeok Kim,
  • Srinivaas Masimukku,
  • Guo-Ping Chang-Chien,
  • Yong-Chein Ling,
  • Sanjay S. Kolekar,
  • Ganesh S. Kamble

摘要

Significant efforts have been focused on the development of non-noble metal electrocatalysts for efficient production of green hydrogen using renewable energy sources such as water and sunlight. Various transition metal oxides have been explored as promising candidates for hydrogen evolution reactions (HER), attracting considerable attention in the field of water splitting. In this study, we report the synthesis of anatase phase TiO2 nanoparticles (NPs) with a crystallite size of 6.94 nm, achieved through a co-precipitation method specifically for neutral water electrochemical HER applications. The as-synthesized anatase phase of TiO2 electrocatalyst have been characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and ultraviolet visible spectroscopy. Transmission electron microscopy analysis revealed that the average particle size of the TiO2 NPs was approximately 5.80 nm. The exceptional HER performance of these nanoparticles can be attributed to their optimal crystallite size, rapid charge transfer kinetics, and reduced band gap energy. The electrocatalyst demonstrated an overpotential of 470 mV to achieve a current density of 10 mA cm−2 in a 0.2 M Na2SO4 electrolyte. Furthermore, the electrode maintained stable HER activity over a continuous period of 50 h, indicating its potential for practical applications. These findings highlight the critical role of crystallite size optimization in enhancing HER activity, particularly in neutral electrolytes. By advancing the understanding of non-noble metal electrocatalysts, this study contributes to the ongoing efforts to develop efficient, sustainable methods for green hydrogen production, aligning with global goals for renewable energy utilization.