Oxygen reduction at silver monolayer islands deposited on gold substrate |
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| Institution: | 1. School of Material Science and Engineering, Henan Polytechnic University, 454001 Jiaozuo, Henan, PR China;2. School of Chemical and Printing-Dyeing Engineering, Henan International Joint Laboratory of Rare Earth Composite Materials, Henan University of Engineering, Xinzheng 451191, Henan, PR China;3. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225009, Jiangsu, PR China;4. National Local Joint Engineering Laboratory to Functional Adsorption Material Technology for the Environmental Protection, Soochow University, Suzhou, 215123, Jiangsu, PR China;1. Institute of Physics, Lodz University of Technology, ul. Wólczańska 219, 93-005 ?ód?, Poland;2. Institute of Chemistry, Environment Protection and Biotechnology, Jan D?ugosz University of Cz?stochowa, ul. Armii Krajowej 13/15, 42-200 Cz?stochowa, Poland;1. King Abdulaziz University, Faculty of Science, Department of Physics, Jeddah, Saudi Arabia;2. Jeddah University, Faculty of Science, Department of Physics, Faisaliah, Saudi Arabia;1. Engineering Research Center of Membrane and Water Treatment Technology of MOE, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;2. Hangzhou Development Center of Water Treatment Technology, Hangzhou 310012, China;1. Instituto Nacional de Tecnologia, MCTI, Avenida Venezuela, 82 sala 716, 20082-301-Saúde, Rio de Janeiro, RJ, Brazil;2. Departamento de Química Inorgânica, Instituto de Química, UFRJ, Avenida Athos da Silveira Ramos 149, Centro de Tecnologia, Bloco A–laboratório 634A, 21941-909 Cidade Universitária, Rio de Janeiro, RJ, Brazil;3. CENPES, –Avenida Horácio de Macedo, 950, 21941-915, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, Brazil;1. Department of Forensic Medicine, Medical University of Lodz, Poland;2. Department of Cardiosurgery, Medical University of Lodz, Poland;3. Department of Medico-Legal and Insurance Certification, Medical University of Lodz, Poland |
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| Abstract: | Underpotential deposition (UPD) of Ag on an Au(1 1 1) coated with a self-assembled monolayer (SAM) of decanethiol gives Ag islands having monatomic height. After reductive desorption of the SAM, Ag monolayer islands were exposed and their catalytic activities for oxygen reduction were examined by voltammetry and hanging meniscus rotating disk (HMRD) measurements. Comparison of electrochemical properties and STM images of electrodes revealed that an island with less than 750 Ag-atoms showed two-electron reduction and that an island with over than 4000 Ag-atoms is necessary to show the original ability of four-electron reduction. |
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