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Supercritical CO2-Modulated Surface Amorphization and OV Defect in CaSnO3 for High-Efficiency Electrocatalytic H2O2
1Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, P.R. China.
Angewandte Chemie (International Ed. in English)
|July 30, 2026
Summary
Supercritical carbon dioxide treatment enhances calcium stannate (CaSnO3) electrocatalysts for efficient hydrogen peroxide (H2O2) production. This method creates defect-rich, amorphous surfaces, boosting H2O2 synthesis rates and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Efficient hydrogen peroxide (H2O2) production via the two-electron water oxidation reaction (2e-WOR) is crucial but hindered by a lack of high-performance electrocatalysts.
- Developing novel strategies to engineer electrocatalyst properties is essential for improving H2O2 synthesis efficiency.
Purpose of the Study:
- To investigate the use of supercritical carbon dioxide (SC CO2) as a modulation strategy to enhance the performance of orthorhombic CaSnO3 for the 2e-WOR.
- To engineer synergistic surface amorphization and oxygen vacancy (OV) defects in CaSnO3 to improve its electrocatalytic activity.
Main Methods:
- Utilized a supercritical carbon dioxide (SC CO2) treatment on orthorhombic CaSnO3 at varying pressures.
- Characterized the structural and defect properties of the treated CaSnO3 using various analytical techniques.
- Evaluated the electrocatalytic performance for H2O2 production via the 2e-WOR, including production rate, Faradaic efficiency (FE), and long-term stability.
Main Results:
- Optimal SC CO2 treatment (16 MPa) induced partial surface amorphization, abundant oxygen vacancies (OV), and Sn3+ defects in CaSnO3.
- These modifications increased unsaturated coordination sites, accelerated charge transfer, and lowered reaction overpotential.
- The optimized catalyst achieved a high H2O2 production rate (26.6 µmol cm-2 min-1), 82% FE at 2.9 V vs RHE, and significantly improved cumulative yield and stability over 24 hours.
Conclusions:
- SC CO2 treatment is an effective method for creating defect-coupled surface amorphous regions in electrocatalysts.
- This approach provides a new paradigm for designing high-performance 2e-WOR electrocatalysts for green H2O2 synthesis.
- Engineered CaSnO3 demonstrates significant potential for efficient and stable electrochemical H2O2 production.
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