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Single-Fe-Atom Catalyst for Sensitive Electrochemical Detection of Caffeic Acid
Xiumin Yang1, Sijia Lv1, Liyong Gan2
1Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
ACS Applied Materials & Interfaces
|November 10, 2023
Summary
A novel single-atom catalyst (Fe SAs/-N-C) was developed for electrochemical sensing. This catalyst demonstrates high stability and conductivity, enabling sensitive detection of caffeic acid (CA).
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Single-atom catalysts (SACs) offer unique advantages in catalysis due to their maximum atom utilization efficiency.
- Developing stable and conductive SACs is crucial for advanced electrochemical applications.
- Caffeic acid (CA) is a bioactive compound with significant pharmacological relevance, necessitating reliable detection methods.
Purpose of the Study:
- To fabricate a highly stable and conductive single-atom catalyst (Fe SAs/-N-C) using a novel precursor composite.
- To investigate the structural benefits of the synthesized catalyst for enhanced catalytic activity and electron transfer.
- To establish an electrochemical sensing platform for caffeic acid (CA) utilizing the developed Fe SAs/-N-C catalyst.
Main Methods:
- High-temperature calcination of a NiFe layered double hydroxide (LDH)/ZIF-8 composite to synthesize Fe single-atom catalyst supported on nitrogen-doped carbon (Fe SAs/-N-C).
- Characterization of the catalyst's structure, including the formation of a 3D interconnected network and Fe-N4 active sites.
- Electrochemical measurements to evaluate the sensitivity, selectivity, and stability of the Fe SAs/-N-C catalyst for caffeic acid detection.
Main Results:
- The synthesis yielded a stable and conductive Fe SAs/-N-C catalyst with a unique 'island-bridge'-like 3D network structure.
- The 3D network structure, facilitated by Ni-catalyzed carbon nanotube formation, enhanced active site exposure and electron transfer.
- The Fe-N4 active sites in Fe SAs/-N-C enabled sensitive, selective, and stable electrochemical sensing of caffeic acid.
Conclusions:
- The developed Fe SAs/-N-C catalyst exhibits excellent performance for electrochemical sensing of caffeic acid.
- This study demonstrates the potential of using LDH/ZIF-8 composites for fabricating advanced single-atom catalysts.
- The findings contribute to expanding the application scope of single-atom catalysts and provide a reference for synthesizing hybrid catalysts.
