Preparation of titania with double band structure derived from a quantum size effect: Drastic increase in the photocatalytic activity

Shoichi Somekawa, Hiroto Watanabe, Yuto Ono, Yuya Oaki, Hiroaki Imai

研究成果: Article査読

抄録

Titania is a competent photocatalyst widely used in environmental purification. Unfortunately, its photocatalytic ability to generate hydrogen by water decomposition without a co-catalyst is poor. Here, an efficient enhancement of noble-metal-free photocatalytic activity was studied on the basis of titania prepared in a supermicroporous silica template using TiCl3 aqueous solution as a precursor. The amount of evolved hydrogen increased sharply by 37 times as the concentration of TiCl3 was increased from 5 to 10 wt%. The existence of two species of titania was determined by XAFS analysis at concentrations of 10 wt% or greater. It is suggested that titania quantum dots inside the supermicropores and titania particles outside the supermicropores were prepared at the optimum precursor concentration and the resultant composite band structures suppressed electron–hole recombination.

本文言語English
論文番号130609
ジャーナルMaterials Letters
304
DOI
出版ステータスPublished - 2021 12 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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