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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Operando Stability of Single-Atom Electrocatalysts.

Geunsu Bae1, Sunghoon Han1, Hyung-Suk Oh2,3

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.

Angewandte Chemie (International Ed. in English)
|February 21, 2023
PubMed
Summary

Single-atom catalysts (SACs) show promise for electrochemical applications but suffer from poor stability. This review details degradation mechanisms in Fe-N-C SACs, focusing on factors affecting catalyst performance and longevity.

Keywords:
Degradation MechanismElectrochemistryHeterogeneous CatalysisOperando StabilitySingle-Atom Catalyst

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Single-atom catalysts (SACs) are advanced materials for electrochemical technologies.
  • Current research focuses on improving the initial activity of SACs.
  • Operational stability remains a significant challenge for practical SAC applications.

Purpose of the Study:

  • To review current knowledge on SAC degradation mechanisms.
  • To focus on iron-nitrogen-carbon (Fe-N-C) SACs as a model system.
  • To categorize degradation pathways and their impact on catalyst performance.

Main Methods:

  • Literature review of recent studies on SAC degradation.
  • Analysis of degradation in isolated metal, ligand, and support components.
  • Categorization of degradation into active site density (SD) and turnover frequency (TOF) losses.

Main Results:

  • SAC degradation mechanisms are complex, involving multiple components.
  • Fe-N-C SACs exhibit specific degradation pathways.
  • Degradation impacts both the number of active sites and their efficiency.

Conclusions:

  • Understanding SAC degradation is crucial for developing stable catalysts.
  • Future research should address identified degradation pathways for enhanced longevity.
  • Prospects for stable SACs depend on mitigating these degradation mechanisms.