Dynamic Behaviour of Pt Microelectrode Arrays during the Galvanostatic Oxidation of CO
In this presentation we will discuss the influence of the size, the interelectrode distance and the supporting electrolyte concentration on the dynamic behaviour of a Pt microelectrode array in the electrooxidation of saturated CO solutions. A custom built galvanostat allows the individual currents flowing through each of the microelectrodes to be measured. Three different kinds of cooperative behaviour could be evidenced for the first time and explained with the help of mathematical modelling. When the applied reaction current value is linearly increased, sequential activation of the microelectrodes was observed (cf. Fig.), while a complex dynamical switching regime was obtained when the current was kept constant5. At low supporting electrolyte concentration, spontaneous oscillations of the potential emerged through the coupling of individual electrodes.
Acknowledgements: Financial support from the International Center for Frontier Research in Chemistry (University of Strasbourg) and of the Labex “Chemistry of Complex Systems” is gratefully acknowledged
- F. Maillard, G.Q. Lu, A. Wieckowski, U. Stimming, J. Phys. Chem. B 109, 16230, 2005
- M.T.M. Koper, T.J. Schmidt, N.M. Markovic, P.N. Ross, J. Phys. Chem. B 105, 8381, 2001
- R. Morschl, J. Bolten, A. Bonnefont, K. Krischer, J. Phys. Chem. C, 112, 9548, 2008
- P. Bauer, A. Bonnefont, K. Krischer, ChemPhysChem, 11, 3002, 2010
- D. A. Crespo-Yapur, A. Bonnefont, R. Schuster, K. Krischer, E.R. Savinova, ChemPhysChem, 14, 1117, 2013