論文

2018年4月23日

New Precursor Route Using a Compositionally Flexible Layered Oxide and Nanosheets for Improved Nitrogen Doping and Photocatalytic Activity

ACS Applied Energy Materials
  • Kazuhiko Maeda
  • ,
  • Yuki Tokunaga
  • ,
  • Keisuke Hibino
  • ,
  • Kotaro Fujii
  • ,
  • Hiroyuki Nakaki
  • ,
  • Tomoki Uchiyama
  • ,
  • Miharu Eguchi
  • ,
  • Daling Lu
  • ,
  • Shintaro Ida
  • ,
  • Yoshiharu Uchimoto
  • ,
  • Masatomo Yashima

1
開始ページ
1734
終了ページ
1741
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/acsaem.8b00256

? 2018 American Chemical Society. 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., O 2- /N 3- 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 KTiNbO 5 , which is a compositionally flexible layered oxide and can be exfoliated into nanoscale sheets. KTiNbO 5 has a unique layered structure, in which Ti 4+ and Nb 5+ coexist in the same two-dimensional sheet, and controllable Ti 4+ /Nb 5+ ratios while maintaining the original KTiNbO 5 -type structure. The use of a Nb-rich oxide precursor could allow for the improvement in the introduction of nitrogen compared with stoichiometric KTiNbO 5 during thermal ammonolysis with ammonia gas. Reassembled KTiNbO 5 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.

リンク情報
DOI
https://doi.org/10.1021/acsaem.8b00256
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85060386319&origin=inward

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