Ruthenium incorporated platinum copper nanotubes for electro-oxidation of methanol

by Mathurin, Leanne Elizabeth; Chen, Jingyi

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Multimetallic nanomaterials can function as efficient electrocatalysts due to the synergistic properties of alloys, specifically electronic coupling and geometric effects. A platinum-copper alloyed nanomaterial increases the no. of available reactive sites, while the nanomaterial's morphol. can increase surface area, which together improves the electrocatalytic activity. Recently, platinum-copper nanostructures have been found to be effective electrocatalysts for methanol oxidn. in direct methanol fuel cells. In this work, we alloy ruthenium into platinum-copper nanostructures, to further improve the electrocatalytic activity. We present a new chem. route to synthesize ruthenium-platinum-copper alloyed nanotubes. Platinum-copper nanotubes function as sacrificial templates, in which copper is galvanically replaced by ruthenium precursor salts. The compn. and morphol. of these ruthenium-platinum-copper nanotubes can be synthetically tuned by controlling the precursor ratio, reaction time, and reaction temp. We will further discuss the enhanced electrocatalytic activity for methanol oxidn. and the underlying mechanism in this presentation.