New Precursor Route Using a Compositionally Flexible Layered Oxide and Nanosheets for Improved Nitrogen Doping and Photocatalytic ActivityClick to copy article linkArticle link copied!
- Kazuhiko Maeda*Kazuhiko Maeda*E-mail [email protected] (K.M.).Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Kazuhiko Maeda
- Yuki TokunagaYuki TokunagaDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Yuki Tokunaga
- Keisuke HibinoKeisuke HibinoDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Keisuke Hibino
- Kotaro FujiiKotaro FujiiDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Kotaro Fujii
- Hiroyuki NakakiHiroyuki NakakiGraduate School of Human and Environmental Studies, Kyoto University, Nihonmatsu-cho, Yoshida, Sakyo-ku, Kyoto 606-8317, JapanMore by Hiroyuki Nakaki
- Tomoki UchiyamaTomoki UchiyamaGraduate School of Human and Environmental Studies, Kyoto University, Nihonmatsu-cho, Yoshida, Sakyo-ku, Kyoto 606-8317, JapanMore by Tomoki Uchiyama
- Miharu EguchiMiharu EguchiElectronic Functional Materials Group, Polymer Materials Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, JapanMore by Miharu Eguchi
- Daling LuDaling LuSuzukakedai Materials Analysis Division, Technical Department, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, JapanMore by Daling Lu
- Shintaro IdaShintaro IdaDepartment of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, JapanMore by Shintaro Ida
- Yoshiharu UchimotoYoshiharu UchimotoGraduate School of Human and Environmental Studies, Kyoto University, Nihonmatsu-cho, Yoshida, Sakyo-ku, Kyoto 606-8317, JapanMore by Yoshiharu Uchimoto
- Masatomo YashimaMasatomo YashimaDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8550, JapanMore by Masatomo Yashima
Abstract
Nitrogen doping into a metal oxide is a conventional method to prepare a visible-light-responsive photocatalyst. However, the charge imbalance that results from aliovalent anion substitution (i.e., O2–/N3– exchange) generally limits the concentration of nitrogen that can be introduced into a metal oxide, which leads to insufficient visible-light absorption capability. Here we report an effective route to synthesize nitrogen-doped metal oxide using KTiNbO5, which is a compositionally flexible layered oxide and can be exfoliated into nanoscale sheets. KTiNbO5 has a unique layered structure, in which Ti4+ and Nb5+ coexist in the same two-dimensional sheet, and controllable Ti4+/Nb5+ ratios while maintaining the original KTiNbO5-type structure. The use of a Nb-rich oxide precursor could allow for the improvement in the introduction of nitrogen compared with stoichiometric KTiNbO5 during thermal ammonolysis with ammonia gas. Reassembled KTiNbO5 nanosheets with a larger surface area were found to be more useful as a precursor than the layered precursor in terms of nitrogen introduction and thus yielded more pronounced visible-light absorption and photocatalytic activity for water oxidation.
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