Alternating‐Current Measurements in Scanning Electrochemical Microscopy,Part 1: Principle and Theory |
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| Authors: | Dao Trinh Dr. Michel Keddam Prof. Xosé R. Novoa Dr. Vincent Vivier |
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| Affiliation: | 1. LISE‐UPR 15 du CNRS, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05 (France), Fax: (+33)?1?4427?4074;2. ENCOMAT group, E.T.S.E.I, Universidade de Vigo, Campus Universitario, 36310 Vigo (Spain) |
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| Abstract: | The development of the scanning electrochemical microscope in ac mode is presented from both experimental and theoretical point of views. The experiments are performed with the ferri/ferrocyanide redox mediator as model system. Based on analysis of the frequency‐dependent collection efficiency, diffusion between the probe and the substrate is investigated, and analysis of time constants allows evaluation of the size of the sensing area under investigation. The experimental results are in good agreement with numerical simulations. |
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| Keywords: | diffusion electrochemistry numerical simulations scanning electrochemical microscopy scanning probe microscopy |
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