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Updated: Oct 20, 2025
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Adjacent single-atom irons boosting molecular oxygen activation on MnO2
Huayu Gu1, Xiao Liu2, Xiufan Liu1
1Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 430079, Wuhan, P. R. China.
Dual adjacent iron atoms on manganese dioxide create a diatomic site for highly efficient carbon monoxide oxidation. This novel single-atom catalyst activates molecular oxygen more effectively than traditional methods.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Efficient molecular oxygen activation is key for catalytic oxidation reactions.
- The design of active sites is critical for achieving high catalytic efficiency.
- Transition metal oxides are widely studied for their catalytic properties.
Purpose of the Study:
- To investigate the formation and catalytic activity of diatomic iron sites anchored on manganese dioxide.
- To explore the mechanism of molecular oxygen activation by these novel Fe dimer sites.
- To compare the performance of diatomic Fe sites with conventional oxygen vacancy sites for CO oxidation.
Main Methods:
- Synthesis of MnO2-hosted Fe dimer active sites.
- Characterization of the diatomic site structure and electronic properties.
- In-situ studies of oxygen activation intermediates during CO oxidation.
Main Results:
- Dual adjacent Fe atoms on MnO2 form a diatomic site (MnO2-hosted Fe dimer).
- This Fe dimer site efficiently activates molecular oxygen, forming a reactive Fe(O=O)Fe intermediate.
- The diatomic Fe sites exhibit superior O2 activation and CO oxidation performance compared to oxygen vacancy sites.
Conclusions:
- MnO2-hosted Fe dimers represent a new class of highly active sites for oxygen activation.
- Single-atom technology provides an effective strategy for designing advanced catalytic materials.
- This study offers insights into oxygen activation mechanisms on transition metal oxides.
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