Nanoparticles' Catalytic Mechanism Revealed Through Combined Experimental and Theoretical Approaches

Strategic Insights -

Researchers from the South China University of Technology have shed light on the catalytic mechanism of CoO nanoparticles (NPs) using an integrated experimental and theoretical approach. The study aimed to understand the perplexing peroxidase-mimicking activity of CoO NPs, a phenomenon that has garnered significant attention in the field of nanotechnology. The research revealed that the catalytic activity of CoO NPs originates from dual synergistic pathways: the nonradical and the radical pathways. This breakthrough discovery is expected to facilitate the rational design and application of nanozymes.

Key Takeaways:

  • The catalytic activity of CoO nanoparticles (NPs) arises from dual synergistic pathways: nonradical and radical pathways.
  • In the nonradical pathways, CoO NPs mediate electron transfer from the substrate to HO through the Co(III)/Co(II) redox couple.
  • During the radical pathways, HO preferentially decomposes into superoxide radicals (O) over hydroxyl radicals (OH).
  • Density functional theory calculations reveal that HO exhibits a relatively lower activation barrier (0.78 eV) to generate O on the CoO (110) facet compared to the higher barrier (1.72 eV) for OH formation.
  • The proposed mechanism is validated by distinct degradation behaviors of organic dyes.
  • This research will encourage further exploration into the catalytic mechanisms of nanozymes, facilitating their rational design and application.
  • The study was conducted by a team of researchers from the South China University of Technology, led by Yun Zhao.

Statistics:

  • CoO NPs exhibit a relatively lower activation barrier (0.78 eV) to generate superoxide radicals (O) compared to the higher barrier (1.72 eV) for hydroxyl radicals (OH) formation.
  • Studies have shown that the degradation behaviors of organic dyes provide further validation of the proposed mechanism.
  • This research has been peer-reviewed and published in Inorganic Chemistry, a leading scientific journal.

Sources:

  • NewsRx. New Findings on Nanoparticles Discussed by Researchers at South China University of Technology (Dual-Mechanism Insights into the Peroxidase-like Activity of Co3O4 Nanoparticles: Nonradical and Superoxide Radical Catalysis). Nanotechnology Weekly. October 13, 2025; p 2470.
  • Inorganic Chemistry. Dual-Mechanism Insights into the Peroxidase-like Activity of Co3O4 Nanoparticles: Nonradical and Superoxide Radical Catalysis. 2025.
  • Inorganic Chemistry (journal homepage). www.pubs.acs.org/journal/inocaj
  • South China University of Technology (School of Environment and Energy). Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control.