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Dynamics of the dissolution of an underpotentially deposited Cu layer on Au(111): a combined time-resolved surface-enhanced infrared and chronoamperometric study
Institution:1. Catalysis Research Center, Hokkaido University, Sapporo 060-0811, Japan;2. Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0811, Japan;3. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Institute of Physical Chemistry, Xiamen University, Xiamen 361005, PR China;1. Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials, Ministry of Education, Yunnan Normal University, Kunming 650500, China;2. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China;1. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China;2. Key Laboratory of Inorganic Nanomaterial of Hebei Province, Shijiazhuang 050024, China;1. Departamento de Física Aplicada I, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;2. Departamento de Física Aplicada II, Escuela Politécnica Superior, Universidad de Málaga, 29071 Málaga, Spain;3. Forschungszentrum Jülich, Institute of Complex Systems (ICS-3), 52425 Jülich, Germany;4. Departamento de Física, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071 Jaén, Spain;5. Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain;1. Department of Materials Engineering, Monash University, Clayton, 3800 Victoria, Australia;2. School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
Abstract:It is well known that an ordered phase consisting of 2/3 monolayer (ML) of Cu and 1/3 ML of sulfate is formed by the underpotential deposition of Cu on Au(111) in sulfuric acid. Dynamic processes involved in the dissolution of the ordered phase for a potential step have been investigated by time-resolved surface-enhanced infrared absorption spectroscopy (SEIRAS) and chronoamperometry. The results demonstrate that the dissolution occurs through two successive steps. The initial step involves the desorption of 1/3 ML of Cu and 1/3 ML of sulfate via a Langmuir-type kinetics and the remaining 1/3 ML of Cu is desorbed in the subsequent step via a nucleation-and-growth kinetics. The observation is partly consistent with dynamic Monte Carlo simulations reported in the literature.
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