Abstract
Se/Ru nanoparticles – a potent non-platinum catalyst towards oxygen reduction reaction – were modified by hydrated WO 3 and investigated using the rotating disk/ring electrode methods and by synchrotron X-ray photoelectron spectroscopy. The modification resulted in an enhanced catalytic activity towards oxygen reduction reaction (ORR). Our data indicate that the oxygen reduction current starts ca. 70 mV more positive and formation of undesirable hydrogen peroxide has significantly decreased following the modification of Se/Ru with WO 3. X-ray photoelectron spectroscopy reveals that WO 3 interacts electronically with Se/Ru as the W 4 f and Se 3 d line-shapes change. We therefore conclude that the electronic interactions between Se/Ru and WO 3 are primarily responsible for the increase in activity and selectivity of the WO 3-modified Se/Ru towards ORR.
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