Is Subsurface Oxygen Necessary for the Electrochemical Reduction of CO 2 on Copper?
Abstract
It has recently been proposed that subsurface oxygen is crucial for the adsorption and subsequent electroreduction of CO 2 on copper. Using density functional theory, we have studied the stability and diffusion of subsurface oxygen in single crystals of copper exposing (111) and (100) facets. Oxygen is at least 1.5 eV more stable on the surface than beneath it for both crystal orientations; interstitial sites are too small to accommodate oxygen. The rate of atomic oxygen diffusion from one layer below a Cu(111) surface to the surface is 5 × 10 3 s –1 . Oxygen can survive longer in deeper layers, but it does not promote CO 2 adsorption there. Diffusion of subsurface oxygen is easier to the less-dense Cu(100) surface, even from lower layers (rate ≈ 1 × 10 7 s –1 ). Once the applied voltage and dispersion forces are properly modeled, we find that subsurface oxygen is unnecessary for CO 2 adsorption on copper.
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Removing the membrane and relying on laminar electrolyte flow can mitigate cross-over in liquid phase electrolyzers.
“Another approach is to remove the membrane, and rely on laminar electrolyte flow to mitigate cross-over, akin to microfluidic fuel cells.[124,125]”
From Electrochemical CO <sub>2</sub> Reduction into Chemical Feedstocks: From Mechanistic Electrocatalysis Models to System Design (2019) · cites this paper as [124]
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- Authors
- Garza, A. J., Bell, A. T., & Head-Gordon, M.
- Affiliations
- Lawrence Berkeley National Laboratory (US)
- Corresponding author
- Bell, Alexis T.
- Venue
- The Journal of Physical Chemistry Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-01-19
- Volume
- 9
- Issue
- 3
- Pages
- 601-606
- ISSN
- 1948-7185 (ISSN-L)
- OpenAlex
- W2782968955
- Cited by
- 148
- References
- 52
- Citations by year
- 2026: 6 · 2025: 10 · 2024: 16 · 2023: 7 · 2022: 20 · 2021: 24 · 2020: 22 · 2019: 27 · 2018: 16
- FWCI
- 5.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Physical Chemistry Letters (publishedVersion)
- PubMed (publishedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- Basic Energy Sciences (DE-SC00004993)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
- Keywords
- subsurface oxygen, electrochemical CO2 reduction, copper electrocatalysis, oxygen diffusion, oxygen adsorption, Cu(111), Cu(100), crystal facets, interstitial sites, surface stability, dispersion interactions
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