日本語
 
Help Privacy Policy ポリシー/免責事項
  詳細検索ブラウズ

アイテム詳細


公開

学術論文

Improving photo-oxidation activity of water by introducing Ti3+ in self-ordered TiO2 nanotube arrays treated with Ar/NH3

MPS-Authors
/persons/resource/persons118137

Klein,  David
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons104326

Cap,  Sébastien
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

External Resource
There are no locators available
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
フルテキスト (公開)
公開されているフルテキストはありません
付随資料 (公開)
There is no public supplementary material available
引用

Xu, Y., Ahmed, R., Klein, D., Cap, S., Freedy, K., McDonnell, S., & Zangari, G. (2019). Improving photo-oxidation activity of water by introducing Ti3+ in self-ordered TiO2 nanotube arrays treated with Ar/NH3. Journal of Power Sources, 414, 242-249. doi:10.1016/j.jpowsour.2018.12.083.


引用: https://hdl.handle.net/21.11116/0000-0002-D7E9-5
要旨
The synthesis of TiO2 nanostructures with visible light absorption is critical for realizing low-cost and efficient photoelectrochemical hydrogen generation from water splitting. In this work, we report an Ar-NH3-Ar treatment method capable to generate Ti3+ species in anodic self-ordered TiO2 nanotube arrays for the synthesis of substoichiometric TiO2 nanotube arrays. The presence of Ti3+ is verified by XPS, EPR and EDS measurements while no detectable N is observed in the material. The modified TiO2 exhibits a 5-fold enhancement in photocurrent compared to pristine TiO2 at 1.23V vs. RHE due to the increased absorption of the solar spectrum. For the 4-h treated sample, a photocurrent of 1 mAcm−2 is obtained at 1.18V vs. RHE, owing to the reduced flat band potential and the increased density of charge carriers evaluated using EIS measurements. The photocatalytic activity can be further optimized by increasing the layer thickness, leading also to a cathodic shift of the onset potential. Furthermore, the modified TiO2 remains intact in air for no less than 1 week. This enhancement in photo-catalytic activity is proven to be closely relevant to the Ti3+ induced by the Ar-NH3-Ar treatment.