Ultrafine Rhodium-Chromium Mixed-Oxide Cocatalyst with Facet-Selective Loading for Excellent Photocatalytic Water...

Area of Science:

• Materials Science
• Photocatalysis
• Green Chemistry

Background:

• Efficient photocatalytic water splitting is key for green hydrogen (H₂) production and carbon neutrality.
• Cocatalysts are crucial reaction sites for water splitting, but their selective loading remains a challenge.
• Ultrafine cocatalysts (∼1 nm) on specific crystal facets can enhance charge separation and photocatalytic activity.

Purpose of the Study:

• To develop a novel method for facet-selective loading of ultrafine H₂-evolution cocatalysts.
• To enhance the photocatalytic water-splitting activity of strontium titanate (SrTiO₃) by targeting specific crystal facets.
• To achieve the highest possible apparent quantum yield for H₂ evolution using SrTiO₃-based photocatalysts.

Main Methods:

• Facet-selective deposition of ultrafine cocatalysts onto the {100} facets of SrTiO₃ photocatalyst.
• Characterization of the loaded cocatalysts and photocatalyst structure.
• Evaluation of photocatalytic H₂ evolution activity under simulated solar irradiation.

Main Results:

• Successful facet-selective loading of ultrafine cocatalysts onto the {100} facets of SrTiO₃.
• The developed photocatalyst achieved the highest apparent quantum yield reported to date for SrTiO₃.
• Demonstrated enhanced charge separation and H₂ evolution efficiency due to targeted cocatalyst loading.

Conclusions:

• The novel facet-selective loading method significantly improves photocatalytic water-splitting performance.
• This approach offers a pathway to enhance various advanced photocatalysts for efficient green hydrogen production.
• The findings are expected to accelerate the transition towards carbon neutrality through improved solar fuel technologies.