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Oxygen-Vacancy-Introduced BaSnO3- δ Photoanodes with Tunable Band Structures for Efficient Solar-Driven Water

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Introducing oxygen vacancies in barium stannate (BaSnO3) photoanodes enhances light absorption and charge separation for efficient photoelectrochemical water splitting. This optimized material achieves high photocurrents and solar-to-hydrogen conversion efficiencies.

Keywords:
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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photocatalysis

Background:

  • Photoelectrochemical (PEC) water splitting requires photoanode materials with superior light absorption and charge separation.
  • Engineering band structures by introducing oxygen vacancies is a key strategy to enhance material properties.

Purpose of the Study:

  • To develop a barium stannate (BaSnO3) photoanode with controlled oxygen vacancies for efficient water splitting.
  • To investigate the impact of oxygen vacancy concentration on the band structure and PEC performance of BaSnO3.

Main Methods:

  • A chemical reduction method was employed to systematically introduce and control oxygen vacancies in BaSnO3.
  • Oxygen evolution cocatalysts (FeOOH/NiOOH) were deposited onto the BaSnO3 photoanode.
  • A tandem device was constructed using a perovskite solar cell and the modified BaSnO3 photoanode.

Main Results:

  • The BaSnO3 photoanode with an optimal oxygen vacancy concentration (8.7%) demonstrated enhanced light absorption and charge separation.
  • The modified photoanode achieved a photocurrent density of 7.32 mA cm-2 at 1.23 V vs. RHE under AM1.5G illumination.
  • The tandem device exhibited an operating photocurrent density of 6.84 mA cm-2 and a solar-to-hydrogen conversion efficiency of 7.92% over 100 hours.

Conclusions:

  • Controlled introduction of oxygen vacancies in BaSnO3 is an effective strategy for improving photoanode performance in water splitting.
  • The developed BaSnO3-based photoanode and tandem device represent a promising system for efficient, unbiased solar water splitting.