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    Controlling the Oxidation State of Pt Single Atoms for Maximizing Catalytic Activity

    Title of paper
    Controlling the Oxidation State of Pt Single Atoms for Maximizing Catalytic Activity
    Author
    [한정우교수 연구실] Pt 단원자의 산화수 조절을 통한 촉매 활성 향상
    Publication in journal
    Angewandte Chemie International Edition 59 (2020) pp20691-20696
    Publication date
    20201109



    [Abstract]

    Single‐atom catalysts (SACs) have emerged as promising materials in heterogeneous catalysis. Previous studies reported controversial results about the relative level in activity for SACs and nanoparticles (NPs). These works have focused on the effect of metal atom arrangement, without considering the oxidation state of the SACs. Here, we immobilized Pt single atoms on defective ceria and controlled the oxidation state of Pt SACs, from highly oxidized (Pt0: 16.6 at %) to highly metallic states (Pt0: 83.8 at %). The Pt SACs with controlled oxidation states were then employed for oxidation of CO, CH4, or NO, and their activities compared with those of Pt NPs. The highly oxidized Pt SACs presented poorer activities than Pt NPs, whereas metallic Pt SACs showed higher activities. The Pt SAC reduced at 300 °C showed the highest activity for all the oxidations. The Pt SACs with controlled oxidation states revealed a crucial missing link between activity and SACs.


    DOI: doi.org/10.1002/anie.202009776
    Link: https://onlinelibrary.wiley.com/doi/full/10.1002/anie.202009776