Stability of Residual Oxides in Oxide‐Derived Copper Catalysts for Electrochemical CO2 Reduction Investigated with 18O Labeling
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Oxide‐derived (OD) Cu catalysts have high selectivity towards the formation of multi‐carbon products (C 2/C 3) for aqueous electrochemical CO 2 reduction (CO 2 R). It has been proposed that a large fraction of the initial oxide can be surprisingly resistant to reduction, and these residual oxides play a crucial catalytic role. The stability of residual oxides was investigated by synthesizing 18 O‐enriched OD Cu catalysts and testing them for CO 2 R. These catalysts maintain a high selectivity towards C 2/C 3 products (ca. 60 %) for up to 5 h in 0.1 m KHCO 3 at −1.0 V vs. RHE. However, secondary‐ion mass spectrometry measurements show that only a small fraction (<1 %) of the original 18 O content remains, showing that residual oxides are not present in significant amounts during CO 2 R. Furthermore, we show that OD Cu can reoxidize rapidly, which could compromise the accuracy of ex situ methods for determining the true oxygen content.
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Based on the XPS analysis, the authors reasoned the high activity to the presence of N-sp3 C active sites as well as high overpotential for HER on NDD catalyst.
“Based on the XPS analysis, the authors reasoned the high activity to the presence of N-sp 3 C active sites as well as high overpotential for HER on NDD catalyst.”
From Electrochemical CO <sub>2</sub> Reduction into Chemical Feedstocks: From Mechanistic Electrocatalysis Models to System Design (2019) · cites this paper as [120]
Liu et al. reported that nitrogen doped nanodiamond (NDD) can serve as a promising catalyst for the formation of acetate.
“Liu et al. reported that nitrogen doped nanodiamond (NDD) can serve as a promising catalyst for the formation of acetate (Figure.8 c,d).[120]”
From Electrochemical CO <sub>2</sub> Reduction into Chemical Feedstocks: From Mechanistic Electrocatalysis Models to System Design (2019) · cites this paper as [120]
Faradaic efficiency of 92% for acetate production has been demonstrated at -0.8 to -1.0 V vs RHE.
“Faradaic efficiency of 92% for acetate production has been demonstrated at -0.8 to -1.0 V vs RHE.”
From Electrochemical CO <sub>2</sub> Reduction into Chemical Feedstocks: From Mechanistic Electrocatalysis Models to System Design (2019) · cites this paper as [120]
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- Authors
- Lum, Y., & Ager, J. W.
- Affiliations
- Lawrence Berkeley National Laboratory (US)
- Corresponding author
- Ager, Joel W.
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2017-12-08
- Volume
- 57
- Issue
- 2
- Pages
- 551-554
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W2767281273
- Cited by
- 410
- References
- 30
- Citations by year
- 2026: 31 · 2025: 35 · 2024: 47 · 2023: 54 · 2022: 59 · 2021: 56 · 2020: 63 · 2019: 40 · 2018: 25
- FWCI
- 9.38
- Type
- journal article
- Language
- en
- Open access
- green
- www.osti.gov
- Licence
- Locations
- Angewandte Chemie International Edition (publishedVersion)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- Basic Energy Sciences (DE-SC0004993)
- National Research Foundation Singapore (Singapore Berkeley Initiative for Sustainable Energy)
- 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 › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Keywords
- electrochemical CO2 reduction, 18O labeling, multi-carbon products, catalyst stability, oxygen determination, catalyst reoxidation, secondary ion mass spectrometry
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