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Nitrogen/fluorine-codoped rutile titania as a stable oxygen-evolution photocatalyst for solar-driven Z-scheme water splitting
| Content Provider | Semantic Scholar |
|---|---|
| Author | Miyoshi, Akinobu Vequizo, Junie Jhon M. Nishioka, Shunta Kato, Yuma Yamamoto, Muneaki Yamashita, Shunsuke Yokoi, Toshiyuki Iwase, Akihide Nozawa, Shunsuke Yamakata, Akira Yoshida, Tomoko Kimoto, Koji Kudo, Akihiko Kazuhiko |
| Copyright Year | 2018 |
| Abstract | Nitrogen/fluorine-codoped rutile TiO2 (R-TiO2:N,F) was newly synthesized, and its photocatalytic activity for water oxidation was evaluated. R-TiO2:N,F could be prepared by nitridation of the rutile TiO2 (R-TiO2) and (NH4)2TiF6 mixture at 773 K. The prepared samples produced O2 from aqueous AgNO3 solution under visible light irradiation, while R-TiO2 nitrided at the same temperature without any fluorine source showed negligible activity. The highest activity was obtained with the sample prepared at the (NH4)2TiF6/R-TiO2 ratio of 15/85, exhibiting water oxidation activity even in the presence of a reversible electron acceptor such as IO3− or Fe3+ with the aid of a RuO2 cocatalyst. Stoichiometric water splitting into H2 and O2 was achieved using a mixture of Ru/SrTiO3:Rh and RuO2/TiO2:N,F in the presence of [Co(bpy)3]3+/2+ (bpy = 2,2′-bipyridine) as a shuttle redox mediator without noticeable degradation of activity under visible light and even under AM1.5G simulated sunlight. Transient absorption spectroscopy revealed that appropriate nitrogen/fluorine codoping reduces the density of mid-gap states working as deep traps of photogenerated electrons, and increases the number of free electrons compared to only nitrogen-doped R-TiO2. Experimental results highlighted that the photocatalytic activity of R-TiO2:N,F could be enhanced by improving visible-light absorption capability through N/F codoping while suppressing the density of deep trap sites. |
| Starting Page | 2025 |
| Ending Page | 2035 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C8SE00191J |
| Volume Number | 2 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c8/se/c8se00191j/c8se00191j1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C8SE00191J |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
