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Updated: Jun 26, 2026
10:57
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Alkali Cations Promote CO2 Electroreduction on Cu(100) Surfaces under Acidic Conditions by Suppressing Surface
Ke Ye1, Qin-Kun Li2, Min Hu3
1Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden.
Journal of the American Chemical Society
|June 25, 2026
Summary
Alkali cations promote carbon dioxide reduction on copper (CO2RR) by reducing hydrogen adlayer coverage, restoring catalytic activity. This dual-role mechanism clarifies cation effects on CO2RR.
Area of Science:
- Electrochemistry
- Surface Science
- Computational Chemistry
Background:
- The catalytic role of copper (Cu) in the carbon dioxide reduction reaction (CO2RR) is known, but cation promotion mechanisms are debated.
- A hydrogen (H) adlayer on Cu surfaces in acidic media can passivate catalytic sites, complicating CO2RR studies.
- Understanding the interplay between H adlayers, cations, and the electric double layer is crucial for optimizing CO2RR.
Purpose of the Study:
- To investigate the influence of H adlayers and cations on CO2RR activity on Cu(100) using a multiscale modeling approach.
- To elucidate the mechanism by which cations like Cs+ affect CO2RR in acidic electrolytes.
- To propose a refined mechanism for cation promotion in CO2RR on copper surfaces.
Main Methods:
- Density Functional Theory (DFT) calculations (GC-DFT) to model the electronic structure and adsorption energies.
- Molecular Dynamics (MD) simulations to study the behavior of ions and solvent at the electrode-electrolyte interface.
- Multiscale modeling combining DFT and MD to capture both electronic and larger-scale interfacial effects.
Main Results:
- The H adlayer on Cu(100) lowers the Cu d-band center, reducing CO2RR activity and making CO2 chemisorption the rate-limiting step.
- Cs+ primarily promotes CO2RR by thermodynamically favoring lower H coverage and suppressing H3O+ adsorption, rather than direct intermediate stabilization.
- A dual-role mechanism is proposed: cations act as depassivants, reducing H coverage and enhancing Cu's intrinsic CO2RR catalytic activity.
Conclusions:
- The presence of a H adlayer significantly impacts CO2RR activity on Cu, attenuating performance.
- Alkali cations, specifically Cs+, play a crucial role in promoting CO2RR by modifying the H adlayer coverage.
- Cation promotion of CO2RR on copper involves a depassivation effect, restoring catalytic activity by removing inhibitory hydrogen species.
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