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Effects of iron-phosphate coating on Ru dissolution in the PtRu thin-film electrodes
Park, Yejun,Lee, Byungjoo,Kim, Chunjoong,Kim, Jongmin,Park, Byungwoo Cambridge University Press (Materials Research Soc 2009 Journal of materials research Vol.24 No.1
<P>The effects of FePO4 nanoscale coating on PtRu thin films were investigated on the block of Ru crossover. Ru dissolution was examined by the accelerated-potential cycles between 0.4 and 1.05 V. The results showed that Ru dissolution from FePO4-coated PtRu surface was inevitable due to the direct contact between the PtRu surface and aqueous electrolyte. However, the FePO4 coating layer on PtRu thin-film electrodes effectively retained the dissolved Ru species, thus preventing the dissolved Ru species from diffusing into the electrolyte. Moreover, the retained Ru species within the FePO4-coating layer were redeposited onto the PtRu surface during the cycling in the fresh electrolyte.</P>
The effects of ruthenium-oxidation states on Ru dissolution in PtRu thin-film electrodes
Park, Yejun,Lee, Byungjoo,Kim, Chunjoong,Oh, Yuhong,Nam, Seunghoon,Park, Byungwoo Cambridge University Press (Materials Research Soc 2009 Journal of materials research Vol.24 No.9
<P>The effects of ruthenium (Ru)-oxidation states were investigated on Ru dissolution from PtRu thin-film electrodes, with the 200 cycles between 0.4 and 1.05 V (versus normal hydrogen electrode). The Ru-oxidation states of the PtRu thin films were systematically modified by an anodic (oxidation) treatment. The anodic-treated PtRu electrodes, whose methanol-oxidation activity was similar to untreated electrodes before the 200 cycles, showed a remarkable decrease in methanol oxidation after the cycles, because of the Ru dissolution from the PtRu surface. The results suggest that the Ru-oxide species are the origin of Ru dissolution in the PtRu alloy.</P>