Synthesis of high-surface-area platinum nanotubes using a viral template

Abstract

A novel method for the synthesis of high-active-surface-area, platinumtobacco mosaic virus (Pt-TMV) nanotubes is presented. A platinum salt is reduced to its metallic form on the external surface of a rod-shaped TMV by methanol, which serves as a solvent and reductant simultaneously. It was found that for the same Pt loading the Pt-TMV nanotubes had an electrochemically active surface area between 4 to 8 times larger than similarly sized Pt nanoparticles. A Pt-TMV catalyst displays greater stability in acidic conditions than those based on nanoparticles. When used as a catalyst for methanol oxidation, these Pt nanotubes display a 65% increase in catalytic mass activity compared to that based on Pt nanoparticles. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.