Selective and efficient reduction of carbon dioxide to carbon monoxide on oxide-derived nanostructured silver electrocatalysts

Ming Ma, Bartek J. Trześniewski, Jie Xie, Wilson A. Smith

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    Abstract

    In this work, the selective electrocatalytic reduction of carbon dioxide to carbon monoxide on oxide-derived silver electrocatalysts is presented. By a simple synthesis technique, the overall high faradaic efficiency for CO production on the oxide-derived Ag was shifted by more than 400 mV towards a lower overpotential compared to that of untreated Ag. Notably, the Ag resulting from Ag oxide is capable of electrochemically reducing CO2to CO with approximately 80 % catalytic selectivity at a moderate overpotential of 0.49 V, which is much higher than that (ca. 4 %) of untreated Ag under identical conditions. Electrokinetic studies show that the improved catalytic activity is ascribed to the enhanced stabilization of COOH.intermediate. Furthermore, highly nanostructured Ag is likely able to create a high local pH near the catalyst surface, which may also facilitate the catalytic activity for the reduction of CO2with suppressed H2evolution.

    Original languageEnglish
    Pages (from-to)9748-9752
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Volume55
    Issue number33
    DOIs
    Publication statusPublished - 1 Jan 2016

    Keywords

    • carbon dioxide
    • conversion of carbon dioxide
    • electrocatalysis
    • heterogeneous catalysis
    • surface chemistry

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