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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Electrochemical CO2 Reduction on Cu-Based Monatomic Alloys: A DFT Study.

Xiaojiao Li1, Liyun Jiang1, Yilei Zhou1

  • 1School of Materials Science and Engineering, and Shaanxi Laboratory of Catalysis, Shaanxi University of Technology, Hanzhong 723001, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 15, 2024
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Summary

Single-atom alloy catalysts (SAAs) show promise for chemical reactions. This study highlights Ir1/Cu(111) SAAs as stable and selective catalysts for electrocatalytic CO2 reduction to methane.

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Area of Science:

  • Materials Science
  • Catalysis
  • Computational Chemistry

Background:

  • Single-atom alloy catalysts (SAAs) combine unique structural and catalytic properties.
  • SAAs offer high activity, selectivity, and stability in various chemical reactions.

Purpose of the Study:

  • To design and investigate Cu-based single-atom alloy catalysts (SAAs) for electrocatalytic CO2 reduction.
  • To identify the most stable SAAs and understand their catalytic mechanisms.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • Systematic investigation of density of states for structural properties.
  • Evaluation of activity and selectivity for CO2 reduction reaction (CO2RR).

Main Results:

  • A series of Cu-based SAAs with isolated 3d transition metals (Fe, Co, Ru, Rh, Os, Ir) on Cu(111) were designed.
  • Ir1/Cu(111) SAAs exhibited the highest stability among the studied 3d-series SAAs due to optimal binding energy.
  • The pathway for CO2 electroreduction to methane (CH4) via *CO intermediates on Ir1/Cu(111) was elucidated.

Conclusions:

  • Ir1/Cu(111) SAAs are promising candidates for selective electrocatalytic CO2 reduction.
  • The study provides theoretical insights for designing advanced Cu-based monatomic alloy catalysts.
  • Understanding reaction pathways is crucial for optimizing catalyst performance.