Multisite atomic-chlorine-passivation stabilizes perovskite interfaces for efficient H₂O₂ photosynthesis from...

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Lead halide perovskites show potential for artificial photosynthesis.
• Aqueous instability limits their practical application.

Purpose of the Study:

• To enhance the stability and performance of lead halide perovskites for solar-driven chemical synthesis.
• To develop a robust photocatalyst for producing hydrogen peroxide from seawater.

Main Methods:

• Stabilizing CsPbI3 quantum dots within a hydrophobic chlorine-functionalized covalent organic framework.
• Utilizing multisite atomic-chlorine passivation for dual Cl-Pb coordination and Cl-I halogen bonding.
• Creating a gas-solid-liquid triphase interface for improved O2 diffusion.

Main Results:

• Achieved production rates of 20.37 mmol h⁻¹ g⁻¹ in seawater.
• Demonstrated a solar-to-chemical conversion efficiency of 1.38%.
• Maintained stable operation for 20 hours, yielding 11.7 mmol L⁻¹ H2O2 under natural sunlight.

Conclusions:

• The developed material offers a stable and efficient platform for perovskite-based photocatalysts.
• This approach enables solar-driven synthesis of hydrogen peroxide from seawater without sacrificial agents.
• Synergistic interfacial charge transfer and dual-reaction pathways are key to the system's performance.