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Updated: Dec 15, 2025

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Stable Ti3+ Defects in Oriented Mesoporous Titania Frameworks for Efficient Photocatalysis.

Kun Lan1,2, Ruicong Wang1, Qiulong Wei3

  • 1Laboratory of Advanced Materials, Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, P. R. China.

Angewandte Chemie (International Ed. in English)
|July 8, 2020
PubMed
Summary

Researchers developed ordered mesoporous titanium dioxide (TiO2) microspheres with Ti3+ defects. This advancement significantly boosts hydrogen generation rates and solar light utilization for sustainable energy applications.

Keywords:
crystalline titaniamesoporous materialsmicellar self-assemblyphotocatalysis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Ordered mesoporous titanium dioxide (TiO2) is crucial for photocatalysis.
  • Controlling defects within TiO2 structures can enhance their photoresponse and catalytic activity.

Purpose of the Study:

  • To synthesize ordered mesoporous TiO2 microspheres with intrinsic Ti3+ defects.
  • To investigate the combined effects of ordered mesostructure and Ti3+ defects on photocatalytic performance, specifically for hydrogen generation.

Main Methods:

  • Utilizing a mono-micelle assembly process with 2-ethylimidazole as a reducing agent and structural template.
  • In-situ reduction of Ti4+ to Ti3+ during calcination to introduce defects.
  • Characterization of mesoporosity, surface area, pore size, and defect concentration.

Main Results:

  • Successfully synthesized ordered mesoporous TiO2 microspheres with radially aligned mesostructure and stable Ti3+ defects.
  • Achieved high surface area (106 m2/g) and mean pore size (18.4 nm).
  • Demonstrated a maximum hydrogen evolution rate of 19.8 mmol/g/h with excellent solar light stability.

Conclusions:

  • The integration of ordered mesoporous architecture and Ti3+ defects enhances mass transport and light utilization in TiO2.
  • This novel material shows significant potential for efficient solar-driven hydrogen production.