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Updated: Aug 7, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Single-atom catalysis enabled by high-energy metastable structures
Zhaoming Xia1, Yue Yin1, Jun Li1
1Department of Chemistry and Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Tsinghua University Beijing 100084 China haixiao@tsinghua.edu.cn.
High-energy metastable structures (HEMS) in single-atom catalysts (SACs), despite low proportions, can unexpectedly drive catalysis. This finding challenges the assumption that only the lowest-energy structure dictates SAC performance.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Single-atom catalysts (SACs) typically adopt a dominant lowest-energy structure (LES).
- The LES is commonly assumed to solely determine the catalytic activity of SACs.
- High-energy metastable structures (HEMS) are often overlooked due to their low populations.
Purpose of the Study:
- To investigate the catalytic role of HEMS in SACs.
- To challenge the prevailing assumption that LES dictates SAC performance.
- To highlight the potential of HEMS in driving catalytic reactions.
Main Methods:
- Computational modeling and simulation of SACs anchored on CeO2.
- Analysis of reaction pathways and energetic landscapes.
- Comparison of catalytic activity between LES and HEMS.
Main Results:
- HEMS, despite low concentrations, exhibit extraordinary catalytic activity.
- Unique coordination environments and oxidation states in HEMS contribute to enhanced performance.
- Catalysis is significantly influenced by HEMS, not just the LES.
Conclusions:
- The common assumption that LES solely governs SAC performance is challenged.
- HEMS play a crucial, often underestimated, role in single-atom catalysis.
- Future research should focus on identifying and exploiting HEMS for catalyst design.
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