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Author: search.filters.author.Areerob, YonrapachSubject: search.filters.subject.Ultrasonic

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    Magnetic and ultrasonic integrated photocatalytic hydrogen evolution effects with Nanosize CoOCu2OZnO and TiO2 decorated on reduced graphene oxide
    (2023-12-01)
    Areerob, Yonrapach
    ;
    Meng, Zeda
    ;
    Ullah, Kefayat
    ;
    Wijaya, Karna
    ;
    Otgonbayar, Zambaga
    In this study, metal oxide composite (CoOCu<inf>2</inf>OZnO) and TiO<inf>2</inf> on graphene oxide composite (CCZ−G−T) were synthesized to improve visible light-driven H<inf>2</inf> evolution through the addition of a cation scavenger, ultrasonic effect, and magnetic field effect. The synthesized nanocomposites were characterized through structural, surface, and electrochemical analyses with band structure. The photocatalyst showed hydrogen production of 792 μmol·g<sup>−1</sup> for 4 hours. Moreover, this CCZ−G−T photocatalyst exhibits relatively high photocatalytic activity at (530−810) μmol·g<sup>−1</sup> when using a scavenger, 1,190 μmol·g<sup>−1</sup> when using a magnetic field of 0.14 T, and 1,230 μmol·g<sup>−1</sup> when using ultrasonic waves. The CCZ−G−T composite exhibited 630 μmol·g<sup>−1</sup> under a magnetic field condition of 0.14 T for 1 hour, which was significantly higher than the hydrogen production rate of 510 μmol·g<sup>−1</sup> under ultrasonic conditions. The current study provides new insights into the magnetic field effect on the hydrogen evolution reaction (HER) of graphene-based photocatalysts.