The Catalytic Centre of Transition Metal Chalcogenides vis-à-vis the Oxygen Reduction Reaction : An In Situ Electrochemical EXAFS Study N. Alonso-Vante, M. Fieber-Erdmann, H. Rossner, E. Holub-Krappe, Ch. Giorgetti, A. Tadjeddine, E. Dartyge, A. Fontaine et R. FrahmJ. Phys. IV France, 7 C2 (1997) C2-887-C2-889DOI: https://doi.org/10.1051/jp4:1997266