淡江大學機構典藏:Item 987654321/124065
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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/124065


    Title: Tailoring competitive adsorption sites by oxygen-vacancy on cobalt oxides to enhance the electrooxidation of biomass
    Authors: Y. Lu;T. Liu;C. L. Dong;C. Yang. L. Zhou;Y. Huang;Y. Li;B. Zhou;Y. Zou;S. Wang
    Keywords: biomass upgrading;electrocatalysts;oxygen vacancy;spinel oxide
    Date: 2021-10-16
    Issue Date: 2023-05-12 12:08:13 (UTC+8)
    Publisher: Wiley-VCH GmbH
    Abstract: The electrooxidation of 5-hydroxymethylfurfural (HMF) offers a promising green route to attain high-value chemicals from biomass. The HMF electrooxidation reaction (HMFOR) is a complicated process involving the combined adsorption and coupling of organic molecules and OH− on the electrode surface. An in-depth understanding of these adsorption sites and reaction processes on electrocatalysts is fundamentally important. Herein, the adsorption behavior of HMF and OH−, and the role of oxygen vacancy on Co3O4 are initially unraveled. Correspondingly, instead of the competitive adsorption of OH− and HMF on the metal sites, it is observed that the OH− can fill into oxygen vacancy (Vo) prior to couple with organic molecules through lattice oxygen oxidation reaction process, which could accelerate the rate-determining step of the dehydrogenation of 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) intermediates. With the modulated adsorption sites, the as-designed Vo-Co3O4 shows excellent activity for HMFOR with the earlier potential of 90 and 120 mV at 10 mA cm−2 in 1 m KOH and 1 m PBS solution. This work sheds insight on the catalytic mechanism of oxygen vacancy, which benefits designing a novel electrocatalysts to modulate the multi-molecules combined adsorption behaviors.
    Relation: Advanced Materials 34(2), 2107185
    DOI: 10.1002/adma.202107185
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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