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<p>This work focused on the synthesis of nickel oxide under varying hydrothermal conditions as a non-precious and efficient catalyst for NaBH<sub>4</sub> hydrolysis to generate hydrogen. The structural, morphological, and textural features of the calcined samples were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and N<sub>2</sub>-physisorption techniques. XPS analysis confirmed the presence of Ni<sup>2+</sup> and Ni<sup>3+</sup> species, with varying Ni<sup>3+</sup>/Ni<sup>2+</sup> ratios across the samples. The NH-200 samples showed the highest hydrogen generation rate, approximately 1290 at 323&#xa0;K, attributed to the enhanced redox behavior of Ni<sup>3+</sup> ions. N<sub>2</sub>-adsorption results revealed mesoporous structures with distinct surface areas and pore characteristics. The catalytic performance was evaluated at 35–50&#xa0;°C, showing enhanced activity with increasing temperature and NaBH<sub>4</sub> concentration (up to 4.5 wt.%). Activation energies were found to be below 59&#xa0;kJ&#xa0;mol<sup>−1</sup>. The catalyst maintained good stability over five consecutive cycles with only a slight performance decline. These findings confirm that NiO is a cost-effective, active, and reusable catalyst for hydrogen generation via NaBH<sub>4</sub> hydrolysis.</p>

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Nickel oxide nanoparticles catalyst for enhancing green hydrogen production: effect of preparation conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月27日

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  • Hatem A. Mahmoud,
  • Aya Adel A. Ali,
  • Tarek T. Ali,
  • Bahaa M. Abu-Zied

摘要

This work focused on the synthesis of nickel oxide under varying hydrothermal conditions as a non-precious and efficient catalyst for NaBH4 hydrolysis to generate hydrogen. The structural, morphological, and textural features of the calcined samples were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and N2-physisorption techniques. XPS analysis confirmed the presence of Ni2+ and Ni3+ species, with varying Ni3+/Ni2+ ratios across the samples. The NH-200 samples showed the highest hydrogen generation rate, approximately 1290 at 323 K, attributed to the enhanced redox behavior of Ni3+ ions. N2-adsorption results revealed mesoporous structures with distinct surface areas and pore characteristics. The catalytic performance was evaluated at 35–50 °C, showing enhanced activity with increasing temperature and NaBH4 concentration (up to 4.5 wt.%). Activation energies were found to be below 59 kJ mol−1. The catalyst maintained good stability over five consecutive cycles with only a slight performance decline. These findings confirm that NiO is a cost-effective, active, and reusable catalyst for hydrogen generation via NaBH4 hydrolysis.