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Crystal Facet-Dependent Metal-Support Interaction for Stabilizing Cuδ+ Species Toward Efficient CO2 Electroreduction
Airong Xu1, Lanyue Zhang1, Yuanhua Sun1
1School of Nuclear Science and Technology, Key Laboratory of Precision and Intelligent Chemistry, Hefei National Research Center for Physical Sciences At the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P.R. China.
This study reveals how different crystal facets of cerium oxide (CeO2) supports affect copper (Cu) catalysts for carbon dioxide (CO2) reduction. The Cu/CeO2-(110) facet offers superior stability by strengthening metal-support interactions, crucial for efficient CO2 conversion.
Area of Science:
- Materials Science
- Catalysis
- Electrochemistry
Background:
- Copper (Cu) species, particularly Cuδ+, are key active sites for electrocatalytic CO2 reduction.
- Metal-support interactions (MSIs) influence Cuδ+ microenvironments, but the role of support crystallographic facets is unclear due to oxygen vacancies.
- Decoupling facet effects from vacancy-related variables is essential for understanding catalyst performance.
Purpose of the Study:
- To definitively investigate the intrinsic contribution of CeO2 support crystallographic facets to Cuδ+ stability and CO2 reduction activity.
- To decouple the facet effect from oxygen vacancy concentrations in CeO2 supports.
- To establish a structure-performance relationship for designing stable CO2 conversion catalysts.
Main Methods:
- Synthesis of Cu single atoms supported on CeO2 with controlled and comparable oxygen vacancy concentrations across different crystallographic facets (110, 100, 111).
- Electrocatalytic CO2 reduction performance testing, including Faradaic efficiency and stability measurements.
- Mechanistic studies involving surface electronic structure analysis and investigation of metal-support interactions.
Main Results:
- A clear facet-dependent stability order was observed: Cu/CeO2-(110) > Cu/CeO2-(100) > Cu/CeO2-(111).
- Methane Faraday efficiency remained largely facet-independent (∼80% at -200 mA/cm2), indicating uniform initial activity.
- The (110) facet demonstrated the strongest MSI, acting as an 'electron buffer' that stabilized Cuδ+ and prevented agglomeration.
Conclusions:
- Facet-dependent MSIs, driven by distinct surface electronic structures, dictate the long-term stability of Cu catalysts.
- The (110) facet's strong MSI is crucial for anchoring high-valent Cuδ+ and enhancing catalyst longevity.
- This study provides a rational geometric descriptor for designing robust electrocatalysts for CO2 conversion.
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