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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number130609
JournalMaterials Letters
Volume304
DOIs
Publication statusPublished - 2021 Dec 1

Keywords

  • Double band structures
  • Photocatalytic hydrogen evolution
  • Quantum size effect
  • Supermicroporous silica
  • Titania

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Preparation of titania with double band structure derived from a quantum size effect: Drastic increase in the photocatalytic activity'. Together they form a unique fingerprint.

Cite this