Local Polarization Piezoelectric Electric Field Promoted Water Dissociation for Hydroxyl Radical Generation under...

Area of Science:

• Materials Science
• Environmental Chemistry
• Catalysis

Background:

• Piezocatalysis combined with ball milling offers potential for water dissociation and hydroxyl radical (·OH) generation.
• Limited understanding exists regarding the interplay between water content and local polarization piezoelectric electric field (LPPEF) in these systems.
• The ·OH formation mechanism in ball milling-driven piezocatalyst systems requires systematic elucidation.

Purpose of the Study:

• To investigate the LPPEF-initiated catalytic reaction at a piezoelectric solid/liquid interface.
• To elucidate the ·OH formation mechanism in a ball milling-driven piezocatalyst system with varying water content.
• To explore the role of trace water in enhancing piezocatalytic activity.

Main Methods:

• Construction of a ball milling-driven piezoelectric solid/liquid interface using Pb₂B₅O₉Cl (PBOC) and varying water content.
• Investigation of LPPEF-initiated catalytic reactions.
• Degradation efficiency studies of Tetrabromobisphenol A (TBBPA) using PBOC compared to SiO₂ and BaTiO₃.

Main Results:

• PBOC demonstrated significantly higher TBBPA degradation rates (68.94x and 12.43x faster) compared to SiO₂ and BaTiO₃, respectively.
• Water dissociation has a lower energy barrier (0.23 eV) under ambient humidity than in water-oversaturated conditions (0.66 eV), favoring ·OH generation.
• Trace water enhances PBOC's polarizability, magnifying LPPEF and promoting ·OH yield through electron trapping by holes in adsorbed water.

Conclusions:

• A highly correlated field-initiated electron transfer system was established, driven by LPPEF.
• Trace water is crucial for optimizing ·OH generation and enhancing piezocatalytic performance.
• This study provides insights for developing advanced piezocatalytic materials for energy conversion and environmental remediation.