A Blinking Mesoporous TiO2−x Composed of Nanosized Anatase with Unusually Long-Lived Trapped Charge Carriers

Tao Zhang, Jingxiang Low, Jiaguo Yu, Alexei M. Tyryshkin, Eliška Mikmeková, Tewodros Asefa

Research output: Contribution to journalArticle

Abstract

A mesoporous TiO2−x material comprised of small, crystalline, vacancy-rich anatase nanoparticles (NPs) shows unique optical, thermal, and electronic properties. It is synthesized using polymer-derived mesoporous carbon (PDMC) as a template. The PDMC pores serve as physical barriers during the condensation and pyrolysis of a titania precursor, preventing the titania NPs from growing beyond 10 nm in size. Unlike most titania nanomaterials, during pyrolysis the NPs undergo no transition from the anatase to rutile phase and they become catalytically active reduced TiO2−x. When exposed to a slow electron beam, the NPs exhibit a charge/discharge behavior, lighting up and fading away for an average period of 15 s for an extended period of time. The NPs also show a 50 nm red-shift in their UV/Vis absorption and long-lived charge carriers (electrons and holes) at room temperature in the dark, even long after UV irradiation. The NPs as photocatalysts show a good activity for CO2 reduction.

Original languageEnglish
Pages (from-to)15000-15007
Number of pages8
JournalAngewandte Chemie - International Edition
Volume59
Issue number35
DOIs
Publication statusPublished - Aug 24 2020

Keywords

  • blinking nanoparticles
  • carbon dioxide reduction
  • long-lived charge carriers
  • photocatalytic energy conversions
  • titanium dioxide

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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