Abstract
99Ru Mössbauer spectra have been obtained for a series of PtRu methanol oxidation anodes. For the most catalytically active sample, XPS and Mössbauer data indicate the presence of Ru(IV) species with a small quadrupole splitting. For highly dispersed samples the Mössbauer data indicate that the Ru is present as a mixture of rutile-phase RuO 2 and a second Ru(IV) species. Comparison with electrocatalytic results suggests that the second Ru(IV) species is the active catalytic copromoter. The possible identity of this species is discussed.
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