Nature and Distribution of Stable Subsurface Oxygen in Copper Electrodes During Electrochemical CO 2 Reduction
Open accessAbstract
Oxide-derived copper (OD-Cu) electrodes exhibit higher activity than pristine copper during the carbon dioxide reduction reaction (CO 2 RR) and higher selectivity toward ethylene. The presence of residual subsurface oxygen in OD-Cu has been proposed to be responsible for such improvements, although its stability under the reductive CO 2 RR conditions remains unclear. This work sheds light on the nature and stability of subsurface oxygen. Our spectroscopic results show that oxygen is primarily concentrated in an amorphous 1–2 nm thick layer within the Cu subsurface, confirming that subsurface oxygen is stable during CO 2 RR for up to 1 h at −1.15 V vs RHE. Besides, it is associated with a high density of defects in the OD-Cu structure. We propose that both low coordination of the amorphous OD-Cu surface and the presence of subsurface oxygen that withdraws charge from the copper sp- and d-bands might selectively enhance the binding energy of CO.
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- Authors
- Cavalca, F., Ferragut, R., Aghion, S., Eilert, A., Diaz-Morales, O., Liu, C., Koh, A. L., Hansen, T. W., Pettersson, L. G. M., & Nilsson, A.
- Affiliations
- Stockholm University (SE)
- Istituto Nazionale di Fisica Nucleare (IT)
- Department of Physics, AlbaNova University Center, Stockholm University, S-10691 Stockholm, Sweden
- Stanford University (US)
- Technical University of Denmark (DK)
- Corresponding author
- Nilsson, Anders
- ORCID
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-10-31
- Volume
- 121
- Issue
- 45
- Pages
- 25003-25009
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2763848521
- Cited by
- 123
- References
- 44
- Citations by year
- 2026: 5 · 2025: 9 · 2024: 13 · 2023: 6 · 2022: 22 · 2021: 20 · 2020: 22 · 2019: 14 · 2018: 11 · 2017: 1
- FWCI
- 3.51
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- other-oa
- Locations
- The Journal of Physical Chemistry C (publishedVersion)
- Virtual Community of Pathological Anatomy (University of Castilla La Mancha) (submittedVersion, other-oa)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) (submittedVersion, other-oa)
- Funders
- Energimyndigheten
- Knut och Alice Wallenbergs Stiftelse
- 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, oxide-derived copper, electrochemical CO2 reduction, ethylene selectivity, surface defects, copper coordination, CO binding energy, electrode stability
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