"Black" TiO2 Nanotubes Formed by High-Energy Proton Implantation Show Noble-Metal-co-Catalyst Free Photocatalytic H2-Evolution

Nano Lett. 2015 Oct 14;15(10):6815-20. doi: 10.1021/acs.nanolett.5b02663. Epub 2015 Sep 14.


We apply high-energy proton ion-implantation to modify TiO2 nanotubes selectively at their tops. In the proton-implanted region, we observe the creation of intrinsic cocatalytic centers for photocatalytic H2-evolution. We find proton implantation to induce specific defects and a characteristic modification of the electronic properties not only in nanotubes but also on anatase single crystal (001) surfaces. Nevertheless, for TiO2 nanotubes a strong synergetic effect between implanted region (catalyst) and implant-free tube segment (absorber) can be obtained.

Keywords: Nanotubes; ion-implantation; photocatalysts; self-organization; titania; water-splitting.

Publication types

  • Research Support, Non-U.S. Gov't