Séminaire par Frédéric Barrière, Université de Rennes 1, le mardi 19 septembre à 11h

Dans le cadre de l’animation scientifique, Frédéric Barrière, chercheur à l’Institut des Sciences Chimiques de Rennes, Université de Rennes 1, présentera une conférence intitulée “Bacteria as Living Catalysts at Modified Electrodes: Mechanism and Applications” le mardi 19 septembre à 11h dans la salle de séminaire de l’ISA.

Résumé de la présentation:
The reductionist biomimetic synthesis of active sites of enzymes often fails to produce simple artificial catalysts that compete with the performance and selectivity of enzymes.1 The direct use of extracted and isolated enzymes at electrodes is possible but suffer from poor catalytic stability in time.2 I will discuss the use of living micro-organisms as electrode catalysts (SEM micrograph below).2 We will address the underlying metabolic mechanisms for exo-cellular electron transfer at anodes3 (e.g. oxidation of acetate) and at cathodes4 (e.g. reduction of dioxygen). One of our interests in the field of bioelectrochemical systems is the tailoring of the microbial-electrode interface through surface grafting in order to improve the development of electroactive biofilm and its electrical connection.3 Several examples of surface modification involving electrostatic or more specific interactions will be presented. Possible applications in energy conversion, bioremediation or sensing will be put forward.5

1. F. Barrière, in Bioinspired Catalysis: Metal-Sulfur Complexes, Eds.: P. Schollhammer & W. Wiegand, John Wiley & Sons, Inc., Chapter 9, p. 225-248 (2014).
2. A. Kumar, H.-H. Hsu, P. Kavanagh, F. Barrière, P. N. L. Lens, L. Lapinsonnière, J. H. Lienhard V, U. Schröder, X. Jiang, D. Leech “The ins and outs of microbial-electrode electron transfer reactions” Nature Reviews Chemistry, 2017, 1, 0024.
3. M. Picot, L. Lapinsonnière, M. Rothballer, F. Barrière, “Graphite Anode Surface Modification with Controlled Reduction of Specific Aryl Diazonium Salts for Improved Microbial Fuel Cells Power Output” Biosensors & Bioelectronics, 2011, 28, 181-188.
4. A. ter Heijne, O. Schaetzle, S. Gimenez, F. Fabregat-Santiago, J. Bisquert, D. P. B. T. B. Strik, F. Barrière, C. J. N. Buisman, H. V. M. Hamelers “Electrochemical impedance spectroscopy for identifying charge and mass transfer resistance of an oxygen biocathode” Energy and Environmental Science, 2011, 4, 5035-5043.
5. Y. R. J. Thomas, M. Picot, A. Carer, O. Berder., O Sientieys, F. Barrière, “A single sediment-Microbial Fuel Cell powering a wireless telecommunication system” Journal of Power Sources, 2013, 241, 703-708.