Solar Water Splitting and Nitrogen Fixation with Layered Bismuth Oxyhalides

Area of Science:

• Photocatalysis for sustainable energy production.
• Materials science focusing on layered bismuth oxyhalides.

Background:

• Hydrogen and ammonia are crucial for energy, environment, and biology.
• Current production methods (methane reforming, Haber-Bosch) are energy-intensive.
• Solar water splitting and nitrogen fixation offer sustainable alternatives but face challenges in photocatalyst efficiency.

Purpose of the Study:

• To detail the use of layered bismuth oxyhalides as photocatalysts for solar water splitting and nitrogen fixation.
• To address key challenges in electron transport and nitrogen activation for enhanced photocatalytic performance.

Main Methods:

• Utilizing the unique layered structures of bismuth oxyhalides to generate an internal electric field (IEF).
• Leveraging surface oxygen vacancies (OVs) for nitrogen activation.
• Investigating strategies to improve IEF and OV functionalities for enhanced solar-to-chemical conversion.

Main Results:

• Layered bismuth oxyhalides demonstrate efficient electron-hole separation and directed migration due to IEF.
• Oxygen termination and interlayer strain facilitate the formation of OVs, enabling efficient nitrogen activation.
• Achieved high visible-light hydrogen and ammonia evolution rates without noble metal co-catalysts.

Conclusions:

• Layered bismuth oxyhalides present a promising new class of photocatalysts for solar hydrogen and ammonia synthesis.
• IEF and OV engineering are effective strategies for optimizing photocatalyst performance.
• Mechanistic insights provide a blueprint for designing advanced photocatalytic systems for solar chemical synthesis.