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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/109846


    Title: Photoelectron Spectroscopy at the Graphene–Liquid Interface Reveals the Electronic Structure of an Electrodeposited Cobalt/Graphene Electrocatalyst
    Authors: Juan J. Velasco-Velez;Verena Pfeifer;Michael Hvecker;Robert S. Weatherup;Rosa Arrigo;Cheng-Hao Chuang;Eugen Stotz;Gisela Weinberg;Miquel Salmeron;Robert Schlogl;and Axel Knop-Gericke
    Date: 2015-11-23
    Issue Date: 2017-03-10 02:13:20 (UTC+8)
    Abstract: Electrochemically grown cobalt on graphene exhibits exceptional performance as a catalyst for the oxygen evolution reaction (OER) and provides the possibility of controlling the morphology and the chemical properties during deposition. However, the detailed atomic structure of this hybrid material is not well understood. To elucidate the Co/graphene electronic structure, we have developed a flow cell closed by a graphene membrane that provides electronic and chemical information on the active surfaces under atmospheric pressure and in the presence of liquids by means of X-ray photoelectron spectroscopy (XPS). We found that cobalt is anchored on graphene via carbonyl-like species, namely Co(CO)x, promoting the reduction of Co3+ to Co2+, which is believed to be the active site of the catalyst.
    Relation: Angewandte Chemie International Edition 54(48), p.14554-14558
    DOI: 10.1002/anie.201506044
    Appears in Collections:[物理學系暨研究所] 期刊論文

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