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In Situ Raman Study of Potential‐Dependent Surface Adsorbed Carbonate, CO, OH, and C Species on Cu Electrodes During Electrochemical Reduction of CO2

Open access
Moradzaman, Mozhgan, Mul, Guido·2021·ChemElectroChem

Abstract

Using in situ surface‐enhanced Raman spectroscopy (SERS), and 13 C/12 C and D 2 O/H 2 O isotopic labeling for assignment, we show potential dependent transients in surface composition of Cu‐catalyzed electrochemical reduction of CO 2 in carbonate solution. First, reduction of Cu(I)oxide is accompanied by adsorption of predominantly monodentate carbonate at ∼1067 cm−1 starting in the potential range from [+0.2 V→−0.2 V]. Contrary to recently advocated hypotheses, and based on the significant presence at anodic potential, a band in this potential range at ∼1540 cm−1 can be assigned to bidentate carbonate. As expected, appearance of surface CO was observed in the range of [−0.4 V→−1.0 V], clearly identified by the Cu−CO vibration at 360 cm−1. Most importantly, at the more negative end of this potential range, we identified the formation of surface OH, and for the first time a surface Cu−C species, showing Raman bands at ∼525 cm−1 (Cu−OH) and ∼500 cm−1 (Cu−C), respectively. In the potential range of [−1.0 V→−1.4 V], surface CO disappears, while the Cu−OH and Cu−C species are persistent. Interestingly positive polarization at >0.1 V removes these species and restores the surface to Cu(I)oxide, rendering the surface processes completely reversible. Implications of this study for mechanistic understanding of electrode deactivation and practical operation are discussed.

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Metadata

Authors
Moradzaman, M., & Mul, G.
Venue
ChemElectroChem
Publisher
Wiley
Published
2021-03-10
Volume
8
Issue
8
Pages
1478-1485
ISSN
2196-0216 (ISSN-L)
OpenAlex
W3135508330
Cited by
179
References
5
FWCI
4.14
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: In Situ Raman Study of Potential‐Dependent Surface Adsorbed Carbonate, CO, OH, and C Species on Cu Electrodes During Electrochemical Reduction of CO2. https://app.cochat.ai/papers/10.1002/celc.202001598
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Moradzaman, M., & Mul, G. (2021). In Situ Raman Study of Potential‐Dependent Surface Adsorbed Carbonate, CO, OH, and C Species on Cu Electrodes During Electrochemical Reduction of CO2. ChemElectroChem. https://doi.org/10.1002/celc.202001598

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