Synthesis of High-Surface-Area Platinum Nanotubes Using a Viral Template

A novel method for the synthesis of high-active-surface-area, platinum tobacco 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.