Optical observation of oxidation and reduction of small supported copper particles |
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| Institution: | 1. BUCT-CWRU International Joint Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, College of Energy, Beijing University of Chemical Technology, Beijing, 100029, China;2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;3. Department of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan;4. School of Materials, Sun Yat-sen University, Guangzhou, 510275, China;5. State Key Laboratory of Chemical Resource Engineering, Laboratory for Advanced Carbon Materials Research, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;6. School of Mechanical and Manufacturing Engineering, University of New South Wales, NSW, 2052, Australia;1. Institute for Experimental Endocrinology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, And Berlin Institute of Health, Berlin, Germany;2. Berlin Institute of Health (BIH), Biomedical Innovation Academy (BIA), Berlin, Germany;3. Department of Surgery, Skåne University Hospital Malmö, Lund University, Malmö, Sweden;4. selenOmed GmbH, Berlin, Germany;5. Division of Oncology, Department of Clinical Sciences Lund, Lund University, Lund, Sweden;6. Department of Oncology, Skåne University Hospital, Lund, Sweden;1. Department of Electrical Engineering, University of Jaén, 23700 EPS Linares, Jaén, Spain;2. Department of Electrical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran;3. Department of Electrical Engineering, Tafresh University, Tafresh, 39518-79611, Iran;1. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China;2. Guangzhou Provincial Key Laboratory of Building Energy Efficiency and Application Technologies, Guangzhou 510006, China;1. University of Birmingham, United Kingdom;2. University of Extremadura, Spain |
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| Abstract: | In situ and real-time optical absorption measurements of supported copper particles (4–10 nm) at wavelengths of 300 to 800 nm are carried out under H2, CO, and O2 respectively as ambient gases in the temperature range of 300 to 673 K. We observe a reversible change in the optical spectra caused by oxidation of copper and reduction of copper oxide. The data strongly indicate that the oxidation of small copper particles is composed of a fast process of Cu to CuOx (x ≈ 0.67) and a slow process of CuOx (x≈ 0.67) to CuO. |
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