淡江大學機構典藏:Item 987654321/120712
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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/120712


    Title: Probing the active site in single-atom oxygen reduction catalysts via operando X-ray and electrochemical spectroscopy
    Authors: Lien, H. T.;Chang, S. T.;Chen, P. T.;Wong, D. P.;Chang, Y. C.;Lu, Y. R.;Dong, C. L.;Wang, C. H.;Chen, K. H.;Chen, L. C.
    Keywords: Characterization and analytical techniques;Electrocatalysis;Fuel cells
    Date: 2020-08-25
    Issue Date: 2021-05-05 12:11:48 (UTC+8)
    Abstract: Nonnoble metal catalysts are low-cost alternatives to Pt for the oxygen reduction reactions (ORRs), which have been studied for various applications in electrocatalytic systems. Among them, transition metal complexes, characterized by a redox-active single-metal-atom with biomimetic ligands, such as pyrolyzed cobalt–nitrogen–carbon (Co–Nx/C), have attracted considerable attention. Therefore, we reported the ORR mechanism of pyrolyzed Vitamin B12 using operando X-ray absorption spectroscopy coupled with electrochemical impedance spectroscopy, which enables operando monitoring of the oxygen binding site on the metal center. Our results revealed the preferential adsorption of oxygen at the Co2+ center, with end-on coordination forming a Co2+-oxo species. Furthermore, the charge transfer mechanism between the catalyst and reactant enables further Co–O species formation. These experimental findings, corroborated with first-principle calculations, provide insight into metal active-site geometry and structural evolution during ORR, which could be used for developing material design strategies for high-performance electrocatalysts for fuel cell applications.
    Relation: Nature Communications 11, 4233 (8 pages)
    DOI: 10.1038/s41467-020-17975-y
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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