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The University of Southampton

Development of scanning electrochemical microscopy in the transient mode and its limitations Seminar

7 May 2013
Room 2003 Chemistry Building 27, Highfield Campus University of Southampton SO17 1BJ

For more information regarding this seminar, please email Dr Andrew Hector at .

Event details

Part of the Electrochemistry Research Seminar Series

The scanning electrochemical microscopy (SECM) is a powerful technique for sensing the local (electro)chemical reactivity of various types of interfaces. It is also used for studying reaction mechanisms taking advantage of the high mass transfer coefficient at the microelectrode in SECM configuration. In a recent series of papers, the Bard’s group has investigated adsorption processes using the surface interrogation mode to quantify electrogenerated oxides (adsorbed oxygen species) on gold and platinum electrodes at neutral pH [1, 2]. In this presentation, we will introduce the ac-SECM, which is a transient technique based on electrochemical impedance spectroscopy for studying adsorbed intermediates involved in multi-step mechanisms [3,4].
In a first part, a special attention will be paid to the description of the technique, the introduction of new complex transfer functions, and the characterization of the diffusion process occurring between the tip and the substrate. In a second part, the ac-SECM will be used for the characterization of specific adsorbed intermediates involved in the hydrogen evolution reaction (HER) and in the oxidation of halide ions. Then, in a last part, the limitation of the technique such as the spatial resolution, the frequency range investigated, and the time constant [5] that can be reached will be discussed.

[1] Rodriguez-Lopez, J.; Alpuche-Aviles, M. A.; Bard, A. J. Journal of the American Chemical Society 2008, 130, 16985-16995.
[2] Rodriguez-Lopez, J.; Bard, A. J. Journal of the American Chemical Society 2010, 132, 5121-5129.
[3] D. Trinh, M. Keddam, X.R. Novoa, V. Vivier. ChemPhysChem 2011, 12, 2169-2176.
[4] D. Trinh, M. Keddam, X.R. Novoa, V. Vivier. ChemPhysChem 2011, 12, 2169-2176.
[5] D. Trinh, E. Maisonhaute, V. Vivier. Electrochem. Comun. 2012, 16, 49-52.

Speaker information

Prof Vincent Vivier, Universite Pierre et Marie Curie, Paris. Vincent is currently a full time researcher in the Laboratoire Interface et Système Electrochimique (LISE-UPR 15), Université Pierre et Marie CURIE (PARIS VI). His research interests include: Development of local electrochemical techniques (scanning electrochemical microscopy – SECM, local electrochemical impedance spectroscopy – LEIS). Development of coupled technique for the characterization of local reactivity: SECM and electrochemical quartz crystal microbalance (EQCM), SECM and electrolyte resistance; Characterization of local processes – Characterization of localized corrosion.; Kinetics of electrochemical processes studied by electrochemical impedance spectroscopy (EIS). Also characterization of powder materials by means of cavity microelectrode.

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