Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 50, Pages 12406-12411Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201702245
Keywords
anodization; nanotubes; photoanodes; photoelectric properties; titanium; water splitting
Categories
Funding
- ERC
- DFG
- Erlangen DFG cluster of excellence
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In the present work we report on the key factors dictating the photoelectrochemical (PEC) performance of suboxide titania (TiOx) nanotubes. TiOx nanotubes were produced by a systematic variation of reduction heat treatments of TiO2 in Ar/H-2. The properties of the TiOx tubes were investigated by electron paramagnetic resonance (EPR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), solid-state conductivity, reflectivity measurements, photocurrent spectroscopy, and photoelectrochemical hydrogen evolution. In line with earlier literature, these suboxide tubes show a drastically improved photoelectrochemical water-splitting performance compared to non-reduced anatase TiO2 tubes. In this work we show that the key improvement in water-splitting performance is due to the strongly improved conductivity of TiOx semimetalic tubes, reaching 13.5 K Omega per tube compared to 70 M Omega (for non-reduced anatase), and is not due to the enhanced visible-light absorbance.
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