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<p>The growing need for sustainable energy and effective carbon management has increased interest in nanostructured photocatalysts capable of CO₂ conversion and hydrogen production under sunlight. This study reports the green hydrothermal synthesis of magnesium oxide (MgO) nanoparticles and evaluates their photocatalytic CO₂ reduction, hydrogen evolution, and photoelectrochemical (PEC) stability under simulated solar light. MgO nanoparticles were prepared using magnesium nitrate and NaOH precursors at 155&#xa0;°C for 24&#xa0;h. The nanomaterial was characterized by XRD, FTIR, UV–Vis, SEM, and Raman spectroscopy. XRD confirmed a pure cubic phase with an average crystallite size of 16.96&#xa0;nm, while SEM revealed nearly spherical particles averaging 56.52 ± 32.30&#xa0;nm. The optical bandgap of 2.0&#xa0;eV supports visible-light activity. Under AM 1.5 solar irradiation, MgO achieved methane and hydrogen yields of 63 µmol g⁻¹ and 61 µmol g⁻¹, respectively, with a stable photocurrent density around 2.5 µA cm⁻². The catalyst retained over 95% of its activity after five successive cycles, confirming excellent durability. These results demonstrate that hydrothermally synthesized MgO nanoparticles possess strong photocatalytic and photoelectrochemical properties, making them promising candidates for efficient solar-driven CO₂ reduction and hydrogen generation toward sustainable energy applications.</p> Graphical abstract <p></p>

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Defect-engineered MgO nanoparticles with high surface area for integrated solar-driven CO2 reduction and hydrogen generation

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Abdelatif Aouadi,
  • Hocine Sadam Nesrat,
  • Sara Aouadi,
  • Abderrhmane Bouafia,
  • Djamila Hamada Saoud,
  • Salah Eddine Laouini,
  • Mamoun Fellah,
  • Hafidha Terea,
  • Mahmood M. S. Abdullah,
  • Zane Zelca

摘要

The growing need for sustainable energy and effective carbon management has increased interest in nanostructured photocatalysts capable of CO₂ conversion and hydrogen production under sunlight. This study reports the green hydrothermal synthesis of magnesium oxide (MgO) nanoparticles and evaluates their photocatalytic CO₂ reduction, hydrogen evolution, and photoelectrochemical (PEC) stability under simulated solar light. MgO nanoparticles were prepared using magnesium nitrate and NaOH precursors at 155 °C for 24 h. The nanomaterial was characterized by XRD, FTIR, UV–Vis, SEM, and Raman spectroscopy. XRD confirmed a pure cubic phase with an average crystallite size of 16.96 nm, while SEM revealed nearly spherical particles averaging 56.52 ± 32.30 nm. The optical bandgap of 2.0 eV supports visible-light activity. Under AM 1.5 solar irradiation, MgO achieved methane and hydrogen yields of 63 µmol g⁻¹ and 61 µmol g⁻¹, respectively, with a stable photocurrent density around 2.5 µA cm⁻². The catalyst retained over 95% of its activity after five successive cycles, confirming excellent durability. These results demonstrate that hydrothermally synthesized MgO nanoparticles possess strong photocatalytic and photoelectrochemical properties, making them promising candidates for efficient solar-driven CO₂ reduction and hydrogen generation toward sustainable energy applications.

Graphical abstract