(3月7日)Development of new mixed anion materials for solar-to-chemical energy conversion
新闻类型:学术活动  阅读次数:  发布时间:2019-03-04

报告题目:Development of new mixed anion materials for solar-to-chemical energy conversion

报告人:Kazuhiko Maeda(前田和彦, 东京工业大学科学学院)

报告时间:2019年3月7日(星期四)上午10:30-12:00

报告地点:福州大学阳光科技大厦北911室

报告摘要:

   Mixed anion compounds that contain more than two anionic species in a single phase are good candidates as visible-light-responsive photocatalysts.1) The key concept in the mixed anion photocatalysts is the use of p orbitals of less electronegative anion than oxygen, which form a more negative valence band, without significantly affecting the conduction band minimum. As the result, a narrow-gap mixed anion material is obtained. For example, many oxynitrides that consist of early transition metal ions or typical metal ions have been reported as photocatalysts for visible-light water splitting and CO2 reduction.2,3) In this talk, recent progress on the development of new mixed anion photocatalysts made by our group will be given.

  For example, we found that an anion-ordered pyrochlore oxyfluoride Pb2Ti2O5.4F1.2 works as a stable photocatalyst for visible-light-driven water reduction/oxidation and CO2 reduction.4) In terms of the electronegativity of anion, oxyfluorides had been believed to be unsuitable as visible-light photocatalysts, because of the highest electronegativity of fluorine. Nevertheless, Pb2Ti2O5.4F1.2 has a small band gap of ca. 2.4 eV (see Figure 1) and indeed works as a photocatalyst. Density functional theory calculations indicated that the unprecedented visible-light-response of Pb2Ti2O5.4F1.2 originates from strong interaction between Pb-6s and O-2p orbitals, which is enabled by a short Pb-O bond in the pyrochlore lattice due to the fluorine substitution.

  1. Kageyama, H.; Hayashi, K.; Maeda, K.; Attfield, J. P.; Hiroi, Z.; Rondinelli, J.; Poeppelmeier, K. R. Nature Commun.2018, 9, 772.

  2. Maeda, K.; Domen, K. Bull. Chem. Soc. Jpn.2016, 89, 627.

  3. Maeda, K. Progress in Solid State Chem.2018, 51, 52.

  4. Kuriki, R.; Ichibha, T.; Hongo, K.; Lu, D.; Maezono, R.; Kageyama, H.; Ishitani, O.; Oka, K.; Maeda, K. J. Am. Chem. Soc.2018, 140, 6648.

报告人简介:


Prof. Kazuhiko Maeda(前田和彦),2007年博士毕业于日本东京大学,师从Kazunari Domen教授。2008-2009年在美国宾夕法尼亚州立大学从事博士后研究(合作导师:Thomas E. Mallouk教授),2009年加入东京大学任助理教授,2012年加入东京工业大学任副教授。2010-2014年期间任命为PRESTO/JST研究员,主要的研究兴趣是光能到化学能转化的多相光催化研究,特别是光解水和二氧化碳固定。已在国际顶尖期刊发表160多篇SCI学术论文,被引用超过28000次,H因子71。

Email: maedak@chem.titech.ac.jp

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