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Light-driven oxygen evolution from water oxidation with immobilised TiO2 engineered for high performance.

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Sol-gel synthesized titanium dioxide (TiO2) calcined at 700°C exhibits enhanced photocatalytic activity for water oxidation. Surface oxygen defects and a higher anatase to rutile ratio are key to this improved performance in oxygen evolution reactions.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Inorganic Chemistry

Background:

  • Titanium dioxide (TiO2) is a widely studied photocatalyst.
  • Optimizing TiO2 properties is crucial for efficient photocatalytic applications.
  • The oxygen evolution reaction (OER) is a key process in water splitting.

Purpose of the Study:

  • To investigate the effect of calcination temperature on the physicochemical properties of sol-gel synthesized TiO2.
  • To evaluate the photocatalytic performance of these TiO2 materials in the oxygen evolution reaction (OER).
  • To identify the key factors contributing to enhanced photocatalytic activity for water oxidation.

Main Methods:

  • Sol-gel synthesis of TiO2 followed by calcination at temperatures ranging from 500-900°C.
  • Characterization of physicochemical properties including optical properties, specific surface area, crystallite size, and crystalline phase.
  • Evaluation of photocatalytic performance in OER using UV-LED irradiation and iron ions as sacrificial electron acceptors.

Main Results:

  • Calcination temperature significantly influences TiO2 properties.
  • The TiO2 sample calcined at 700°C (TiO2-700) demonstrated the highest activity for water oxidation.
  • Higher anatase to rutile ratio and increased surface oxygen vacancy density correlated with enhanced OER performance.
  • Oxygen defects on the TiO2 surface act as active adsorption sites for water oxidation.

Conclusions:

  • Optimized calcination treatment of sol-gel TiO2 can significantly enhance its photocatalytic activity for OER.
  • Surface oxygen vacancies are critical active sites for efficient water oxidation.
  • Immobilized TiO2-700 shows promising efficiency in continuous mode water oxidation, exceeding 12% apparent quantum efficiency (AQE).