Abstract
The presence of a large population of hydroxyl groups (originating from zirconia) in the vicinity of PtRu, in addition to possible specific interactions between zirconia and the ruthenium component, most likely induced oxidative removal (from Pt) of otherwise passivating CO adsorbates. Although Rh itself did not show directly any activity toward the ethanol oxidation, the metal is expected to facilitate C-C bond splitting in C2H5OH molecule. Codeposition and introduction of metallic rhodium particles to ZrO2 also improved the overall conductivity of the matrix and charge distribution at the electrocatalytic interface. Application of the nanoporous platinum electrode substrate together with Rh and ZrO2 components as well as PtRu electrocatalytic sites led to enhancement of the electrocatalytic currents larger than one would expect from simple addition of activities of single components.
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