Spontaneous Symmetry Breaking via Metal-Triggered Surface Defect Engineering for Durable Piezocatalytic Hydrogen...

Area of Science:

• Materials Science
• Catalysis
• Energy Conversion

Background:

• Piezocatalysis converts mechanical energy to chemical fuels, offering sustainable hydrogen production.
• Current limitations include weak polarization, few active sites, and poor device-level durability.
• Need for advanced strategies to improve material performance and long-term stability.

Purpose of the Study:

• To develop a metal-triggered surface defect strategy for enhanced piezocatalysis.
• To improve polarization and active site density for efficient hydrogen production.
• To demonstrate long-term, device-level piezocatalytic hydrogen generation.

Main Methods:

• Engineered surface defects by anchoring gold (Au) onto zinc stannate (ZnSnO3).
• Investigated the impact of Au anchoring on surface symmetry and piezoelectric response.
• Integrated the catalyst into a custom continuous-flow microreactor for device testing.

Main Results:

• Au anchoring induced Zn vacancies, increasing the piezoelectric response over fivefold.
• Achieved a 3.7-fold enhancement in the hydrogen evolution rate.
• Demonstrated stable, device-level piezocatalytic hydrogen production for over 158 hours.

Conclusions:

• Metal-triggered surface defect engineering effectively enhances piezocatalytic activity and durability.
• The strategy balances proton reduction and hydrogen desorption via optimized energetics.
• Establishes a new benchmark for long-term piezocatalytic hydrogen production systems.