Engineering the outermost layers of TiO2 nanoparticles using in situ Mg doping in a flame aerosol reactor

Yanjie Hu, Hao Jiang, Yunfeng Li, Binqi Wang, Ling Zhang, Chunzhong Li, Yang Wang, Theodore Cohen, Yi Jiang, Pratim Biswas

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

Titanium dioxide nanoparticles with disordered outermost layer sturctures have significantly enhanced light absorption and photocatalytic properties and thus receiving enhanced attention in recent years. Engineering the outermost layers using in situ magnesium doping to tailor the band-edge of TiO2nanoparticles was achieved via a flame aerosol reactor. The distribution of doped elements in nanoparticles could be controlled in a high temperature flame process, and which could be predicted by the comparison of different characteristic time scales, such as reaction time, coagulation time, and sintering time is proposed. In situ magnesium doping on the outermost layers effectively tailored the conduction band and electron structure of the TiO2nanoparticles, and simultaneously improved the maximum photocurrent as well as the maximum photovoltage in dye-sensitized solar cells. These improvements were largely attributed to red-shifted light absorption, and rapid photoelectron injection into the conduction band.

Original languageEnglish
Pages (from-to)870-880
Number of pages11
JournalAICHE Journal
Volume63
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

Keywords

  • characteristic time
  • flame aerosol reactor
  • in situ doping
  • outermost layer
  • titanium dioxide

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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