Self-decoration of Pt metal particles on TiO2 nanotubes used for highly efficient photocatalytic H2 production

Abstract

Pt decorated TiO₂ has, over the past decades, been a key material for photocatalytic hydrogen production. The present work shows that growing anodic self-organized TiO₂ nanotubes from Ti–Pt alloy with a low Pt content of 0.2 at% leads to oxide nanotube layers that are self-decorated with Pt nanoparticles of 4–5 nm in diameter. The average particle spacing is in the range of ~50 nm and is partially adjustable by the anodization conditions. This intrinsic decoration of TiO₂ nanotubes with Pt leads to a highly active photocatalyst for the production of H₂ under UV or visible light conditions.