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<p>This study investigates the synthesis, structural, thermal, dielectric, and catalytic properties of Y<sub>2</sub>O<sub>3</sub>-doped borate glass-ceramics for hydrogen production via NaBH<sub>4</sub> methanolysis. Glass-ceramic samples with compositions of 55 B<sub>2</sub>O<sub>3</sub> − 15 ZnO − 30 Na<sub>2</sub>O and varying Y<sub>2</sub>O<sub>3</sub> content (0–40 wt%) were prepared using the melt-quenching technique, followed by sintering to induce nanocrystal growth. Structural characterization revealed that Y<sub>2</sub>O<sub>3</sub> incorporation increased density (2.4893 to 3.2541&#xa0;g/cm<sup>3</sup>) and molar volume (26.913 to 40.109 cm<sup>3</sup>/mol) due to the replacement of lighter oxides with heavier Y<sub>2</sub>O<sub>3</sub> and the larger ionic radius of Y<sup>3+</sup>. XRD confirmed the formation of Y<sub>2</sub>O<sub>3</sub> nanocrystals, with crystallite sizes ranging from 20 to 85&#xa0;nm, while FTIR spectra indicated structural modifications in the glass network. SEM-EDX analysis demonstrated uniform nanoparticle distribution in the 10 wt% sample, which exhibited the highest catalytic activity for hydrogen production (6716 mL/g·min). Dielectric studies showed that Y<sub>2</sub>O<sub>3</sub> enhanced the dielectric constant and thermal stability, with the real part of the electric modulus (M’) increasing with frequency and Y<sub>2</sub>O<sub>3</sub> content. DC conductivity initially decreased (0–5 wt% Y₂O₃) due to charge carrier trapping but increased at higher Y<sub>2</sub>O<sub>3</sub> concentrations (5–40 wt%) due to improved ion migration pathways. Hydrogen production experiments revealed that Y<sub>2</sub>O<sub>3</sub>-doped samples significantly accelerated NaBH<sub>4</sub> methanolysis, with the Y10 sample achieving the highest rate due to its optimal nanoparticle distribution. The activation energy for hydrogen production was calculated as 37.31&#xa0;kJ/mol, reflecting the efficient catalytic performance of the Y<sub>2</sub>O<sub>3</sub>-based glass-ceramic. This work highlights the potential of Y<sub>2</sub>O<sub>3</sub>-doped glass-ceramics as effective catalysts for hydrogen generation, with applications in clean energy technologies.</p>

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Synthesis and characterization of Y2O3 modified borate glass-ceramics for efficient hydrogen production

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Taha Abdel Mohaymen Taha,
  • Ahmed El-Seady,
  • S. El-Rabaie,
  • A.A. El-Adawy

摘要

This study investigates the synthesis, structural, thermal, dielectric, and catalytic properties of Y2O3-doped borate glass-ceramics for hydrogen production via NaBH4 methanolysis. Glass-ceramic samples with compositions of 55 B2O3 − 15 ZnO − 30 Na2O and varying Y2O3 content (0–40 wt%) were prepared using the melt-quenching technique, followed by sintering to induce nanocrystal growth. Structural characterization revealed that Y2O3 incorporation increased density (2.4893 to 3.2541 g/cm3) and molar volume (26.913 to 40.109 cm3/mol) due to the replacement of lighter oxides with heavier Y2O3 and the larger ionic radius of Y3+. XRD confirmed the formation of Y2O3 nanocrystals, with crystallite sizes ranging from 20 to 85 nm, while FTIR spectra indicated structural modifications in the glass network. SEM-EDX analysis demonstrated uniform nanoparticle distribution in the 10 wt% sample, which exhibited the highest catalytic activity for hydrogen production (6716 mL/g·min). Dielectric studies showed that Y2O3 enhanced the dielectric constant and thermal stability, with the real part of the electric modulus (M’) increasing with frequency and Y2O3 content. DC conductivity initially decreased (0–5 wt% Y₂O₃) due to charge carrier trapping but increased at higher Y2O3 concentrations (5–40 wt%) due to improved ion migration pathways. Hydrogen production experiments revealed that Y2O3-doped samples significantly accelerated NaBH4 methanolysis, with the Y10 sample achieving the highest rate due to its optimal nanoparticle distribution. The activation energy for hydrogen production was calculated as 37.31 kJ/mol, reflecting the efficient catalytic performance of the Y2O3-based glass-ceramic. This work highlights the potential of Y2O3-doped glass-ceramics as effective catalysts for hydrogen generation, with applications in clean energy technologies.