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<p>The pressing demand for sustainable energy solutions drives the development of advanced photocatalysts that efficiently convert CO₂ into value-added products. In this study, we synthesized ZnO/ZnCo<sub>2</sub>O<sub>4</sub> (ZnCo-MMC) nanocomposites using an ultrasonic-assisted hydrothermal method to evaluate their photocatalytic performance in CO₂ reduction under solar irradiation. Powder X-Ray Diffraction (XRD) analysis demonstrated successful phase integration and validated the ZnO/ ZnCo<sub>2</sub>O<sub>4</sub> mixed-phase structure. BET analysis revealed mesoporosity and a large surface area of 84.5 m<sup>2</sup>/g. The photocatalytic performance of the ZnCo-MMC was investigated towards photoreduction of CO<sub>2</sub> to CH<sub>3</sub>OH. The ZnCo-MMC catalyst achieved a maximum methanol production rate of 0.93&#xa0;μmol&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup> and CO yield of 2.52&#xa0;μmol&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup> at 150&#xa0;°C, with an optimal catalyst dosage of 0.3&#xa0;mg and irradiation time of 1&#xa0;h. Photocurrent and PL analyses confirmed efficient charge separation in ZnCo-MMC, with low PL intensity and sustained photocurrent response indicating reduced electron–hole recombination for improved photocatalytic activity. The synthesized heterogeneous photocatalyst demonstrated easy recoverability using an external magnet, while reusability tests showed high stability with ZnCo-MMC retaining 92% of its initial activity after six consecutive cycles. These findings demonstrate ZnCo-MMC's potential as a catalyst for solar fuel production and sustained CO₂ reduction, offering a practical path to carbon–neutral energy solutions.</p>

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Facile synthesis of mixed-phase cobalt-zinc metal oxide for enhanced solar fuel generation via photocatalytic CO2 reduction

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • R. Shankari,
  • D. Hemanand,
  • M. Anto Bennet,
  • R. Arun

摘要

The pressing demand for sustainable energy solutions drives the development of advanced photocatalysts that efficiently convert CO₂ into value-added products. In this study, we synthesized ZnO/ZnCo2O4 (ZnCo-MMC) nanocomposites using an ultrasonic-assisted hydrothermal method to evaluate their photocatalytic performance in CO₂ reduction under solar irradiation. Powder X-Ray Diffraction (XRD) analysis demonstrated successful phase integration and validated the ZnO/ ZnCo2O4 mixed-phase structure. BET analysis revealed mesoporosity and a large surface area of 84.5 m2/g. The photocatalytic performance of the ZnCo-MMC was investigated towards photoreduction of CO2 to CH3OH. The ZnCo-MMC catalyst achieved a maximum methanol production rate of 0.93 μmol g−1 h−1 and CO yield of 2.52 μmol g−1 h−1 at 150 °C, with an optimal catalyst dosage of 0.3 mg and irradiation time of 1 h. Photocurrent and PL analyses confirmed efficient charge separation in ZnCo-MMC, with low PL intensity and sustained photocurrent response indicating reduced electron–hole recombination for improved photocatalytic activity. The synthesized heterogeneous photocatalyst demonstrated easy recoverability using an external magnet, while reusability tests showed high stability with ZnCo-MMC retaining 92% of its initial activity after six consecutive cycles. These findings demonstrate ZnCo-MMC's potential as a catalyst for solar fuel production and sustained CO₂ reduction, offering a practical path to carbon–neutral energy solutions.