The Catalytic Centre of Transition Metal Chalcogenides vis-à-vis the Oxygen Reduction Reaction : An In Situ Electrochemical EXAFS Study
نویسندگان
چکیده
The Chevrel type chalcogenide with the stoichiometry Mo6.,M,Xs (M=transition metal, e.g., M,=Ru2; X=Chalcogene atom, e.g., S, Se) containing octahedral mixed-metal clusters of transition-metal atoms was investigated with respect to the oxygen reduction process in an in situ electrochemical enviroment via the EXAFS technique. The spectra analysis on Ru and MO edges as a function of applied electrode potential revealed that ruthenium centers were preferentially modified by the presence of oxygen in the electrolyte. The variation in distance between Ru-(Ru, MO) was more sensitive in oxygen saturated solution as compared to MO-(Ru, MO) and Ru-Se.
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