Abstract
The aim of this work was to investigate a Ru-cluster material with a low molybdenum concentration. This latter is considered to act as an adsorption site for molecular oxygen. Transition metal chalcogenide materials based on Mo-Ru-Se for electrocatalytic reduction of molecular oxygen in acid medium were chemically prepared by reacting the transition metal carbonyl compounds and selenium powder in xylene solvent (140 °C). The stoichiometry of the semiconducting electrocatalyst corresponds to (Ru 1 − x Mo x ) y SeO z where 0.02 < x < 0.04; 1 < y < 3 and z ≈ 2 y. Kinetics parameters were obtained using steady state measurements with the rotating ring disk electrode ( rrde) with electrocatalyst deposited on glassy carbon disks or with the powder incorporated in a disk of carbon paste matrix. Oxygen reduction proceeds mostly via a four-electron transfer reaction (96%) to water as determined by the rotating ring disk electrode technique. The heterogeneous rate constants, k 1 (water formation from oxygen), k 2 (hydrogen peroxide formation) and k 3 (water production from generated H 2O 2) were evaluated over the potential range of 0.70 to 0V/ nhe. Temperature dependence (296 K to 338 K) and kinetic parameters were evaluated. It is concluded that minimising the molybdenum content leads to improved electrocatalysis.
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