SYNTHESIS OF W-SE-OS CARBONYL ELECTROCATALYST FOR OXYGEN REDUCTION IN0.5 M H2SO4

Transition metal chalcogenide material based on W-Se-Os(CO)(n) cluster electrocatalyst were prepared by reacting the transition metal carbon yl compounds OS3(CO)(12) and W(CO)(6), with elemental selenium in 1,2- dichlorobenzene (bp approximate to 180 degrees C). The synthesized mat erial was characterized by FT-IR, C-13 MAS NMR spectroscopy, X-ray dif fraction (XRD), SEM and electrochemically. XRD indicated that the powd er presents crystalline structure supported on an amorphous surface. T he electrocatalytic activity for molecular oxygen reduction was studie d by a Rotating Ring-Disc Electrode (rrde) technique in a 0.5 M H2SO4. The results showed that the oxygen reduction occurs via multielectron charge transfer (n = 4e(-)), to water formation. The yield to water f ormation is more than 96%. (C) 1998 Published by Elsevier Science Ltd on behalf of the International Association for Hydrogen Energy.