Black TiO2 Nanotubes: Cocatalyst-Free Open-Circuit Hydrogen Generation

Journal article


Publication Details

Author(s): Liu N, Schneider C, Freitag D, Hartmann M, Venkatesan UM, Müller J, Spiecker E, Schmuki P
Journal: Nano Letters
Publisher: American Chemical Society
Publication year: 2014
Volume: 14
Journal issue: 6
Pages range: 3309-3313
ISSN: 1530-6984


Abstract


Here we report that TiO2 nanotube (NT) arrays, converted by a high pressure H-2 treatment to anatase-like "black titania", show a high open-circuit photocatalytic hydrogen production rate without the presence of a cocatalyst. Tubes converted to black titania using classic reduction treatments (e.g., atmospheric pressure H-2/Ar annealing) do not show this effect. The main difference caused by the high H-2 pressure annealing is the resulting room-temperature stable, isolated Ti3+ defect-structure created in the anatase nanotubes, as evident from electron spin resonance (ESR) investigations. This feature, absent for conventional reduction, seems thus to be responsible for activating intrinsic, cocatalytic centers that enable the observed high open-circuit hydrogen generation.



FAU Authors / FAU Editors

Hartmann, Martin Prof. Dr.
Professur für Katalyse
Liu, Ning Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Müller, Julian Dr.-Ing.
Sonderforschungsbereich/Transregio 103 Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen
Schmuki, Patrik Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Schneider, Christopher
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Venkatesan, Uma Maheswari
Interdisziplinäres Zentrum Erlangen Catalysis Resource Center (ECRC)


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Research Fields

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials
A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Liu, N., Schneider, C., Freitag, D., Hartmann, M., Venkatesan, U.M., Müller, J.,... Schmuki, P. (2014). Black TiO2 Nanotubes: Cocatalyst-Free Open-Circuit Hydrogen Generation. Nano Letters, 14(6), 3309-3313. https://dx.doi.org/10.1021/nl500710j

MLA:
Liu, Ning, et al. "Black TiO2 Nanotubes: Cocatalyst-Free Open-Circuit Hydrogen Generation." Nano Letters 14.6 (2014): 3309-3313.

BibTeX: 

Last updated on 2019-29-05 at 15:46