August 15, 2025

Dipole Moment and Polarization Field Induced by Oxygen Vacancies Boosting Piezocatalytic Hydrogen Peroxide Production of Centrosymmetric Material.

Key Points

The production efficiency of hydrogen peroxide exceeds 512.29 μmol g-1 h-1, demonstrating significant advancements in synthesis.
Mechanistic studies indicate enhanced water adsorption and reduced energy barriers facilitate effective oxidation pathways for H2O2 production.
With oxygen vacancies in SnO, the material shows improved dipole moments and polarization fields, supporting higher catalytic performance.
The findings highlight a novel strategy for synthesizing H2O2, potentially benefiting sustainable water purification methods.

Abstract

Piezocatalysis is a sustainable and promising strategy for H2O2 synthesis; however, its efficiency is limited by sluggish interfacial charge-transfer kinetics and insufficient active sites. Herein, an oxygen vacancy-rich SnO (SnO-OVs) piezocatalyst was designed with abundant active sites, enhanced dipole moments, and intensified polarization fields, which collectively boost the piezocatalytic H2O2 production efficiency. The SnO-OVs achieve an exceptional production rate of 512.29 μmol g-1 h-1 in pure water without any sacrificial agents. Mechanistic studies reveal that under compressive strain, SnO-OVs exhibit superior water adsorption capacity and a reduced energy barrier for *OH intermediate formation, synergistically promoting the two-electron water oxidation pathway (2e- WOR) for H2O2 synthesis. Additionally, H2O2 preferentially dissociates into *OH rather than forming *O and *H2O under compressive strain, resulting in effective piezocatalytic BPA degradation via radical-dominated •OH oxidation pathways. This work introduces a novel strategy for efficient H2O2 synthesis and facilitates the advancement of sustainable water purification technologies.

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