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

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journal contribution
posted on 14.10.2015, 00:00 by Ning Liu, Volker Häublein, Xuemei Zhou, Umamaheswari Venkatesan, Martin Hartmann, Mirza Mačković, Tomohiko Nakajima, Erdmann Spiecker, Andres Osvet, Lothar Frey, Patrik Schmuki
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.