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<p>In the upsurge of emergent semiconductor materials as photocatalytic agents, zinc oxide (ZnO) nanostructures have shown their promise extensively. However, the implication of shape-controlled ZnO is still lacking. In this study, we construct two distinct shapes of ZnO spheres (ZnO-s) and needle-like ZnO (ZnO-n) that are grown by sol–gel and hydrothermal methods for hydrogen production photocatalysts. The hydrogen production of ZnO-s and ZnO-n is 19.78 and 12.25&#xa0;µmol.g<sup>−1</sup>, respectively, after 4&#xa0;h of irradiation. Both shapes of ZnO exhibit a greater quantity in comparison to commercial ZnO (ZnO-c) for hydrogen production (5.3&#xa0;µmol.g<sup>−1</sup>). Various characterizations including X-ray diffraction (XRD), UV diffuse reflectance spectroscopy (UV-DRS), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) have been carried out. Photoluminescence (PL) spectroscopy indicated that both ZnO-s and ZnO-n exhibit a reduced PL intensity relative to ZnO-c. This finding demonstrates that the electron recombination in both ZnO-s and ZnO-n was suppressed. Furthermore, the UV–Vis DRS validated that both zinc oxide nanostructures have band gaps within the visible-light spectrum.</p>

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Efficient hydrogen production via photocatalytic water splitting using advanced visible-light-responsive ZnO nanostructures

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Garcelina Rizky Anindika,
  • Riki Subagyo,
  • Jonathan Angelo Ranamanggala,
  • Hendro Juwono,
  • Didik Prasetyoko,
  • Arramel Arramel,
  • Yuly Kusumawati

摘要

In the upsurge of emergent semiconductor materials as photocatalytic agents, zinc oxide (ZnO) nanostructures have shown their promise extensively. However, the implication of shape-controlled ZnO is still lacking. In this study, we construct two distinct shapes of ZnO spheres (ZnO-s) and needle-like ZnO (ZnO-n) that are grown by sol–gel and hydrothermal methods for hydrogen production photocatalysts. The hydrogen production of ZnO-s and ZnO-n is 19.78 and 12.25 µmol.g−1, respectively, after 4 h of irradiation. Both shapes of ZnO exhibit a greater quantity in comparison to commercial ZnO (ZnO-c) for hydrogen production (5.3 µmol.g−1). Various characterizations including X-ray diffraction (XRD), UV diffuse reflectance spectroscopy (UV-DRS), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) have been carried out. Photoluminescence (PL) spectroscopy indicated that both ZnO-s and ZnO-n exhibit a reduced PL intensity relative to ZnO-c. This finding demonstrates that the electron recombination in both ZnO-s and ZnO-n was suppressed. Furthermore, the UV–Vis DRS validated that both zinc oxide nanostructures have band gaps within the visible-light spectrum.