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Title: Stability of Residual Oxides in Oxide-Derived Copper Catalysts for Electrochemical CO2 Reduction Investigated with 18O Labeling

Journal Article · · Angewandte Chemie (International Edition)

Abstract 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation Singapore
Grant/Contract Number:
AC02-05CH11231; SC0004993
OSTI ID:
1530326
Alternate ID(s):
OSTI ID: 1412581
Journal Information:
Angewandte Chemie (International Edition), Vol. 57, Issue 2; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 261 works
Citation information provided by
Web of Science

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Metal-based heterogeneous electrocatalysts for reduction of carbon dioxide and nitrogen: mechanisms, recent advances and perspective journal January 2018
On the Oxidation State of Cu 2 O upon Electrochemical CO 2 Reduction: An XPS Study journal July 2019
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Partially Oxidized Palladium Nanodots for Enhanced Electrocatalytic Carbon Dioxide Reduction journal August 2018
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Potential-induced nanoclustering of metallic catalysts during electrochemical CO2 reduction journal August 2018
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Improved CO2 reduction activity towards C2+ alcohols on a tandem gold on copper electrocatalyst journal October 2018
Nitride-Derived Copper Modified with Indium as a Selective and Highly Stable Catalyst for the Electroreduction of Carbon Dioxide text January 2019
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Paramelaconite‐Enriched Copper‐Based Material as an Efficient and Robust Catalyst for Electrochemical Carbon Dioxide Reduction journal June 2019
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Strategies for Designing Nanoparticles for Electro‐ and Photocatalytic CO 2 Reduction journal December 2019
Electrochemical CO 2 Reduction into Chemical Feedstocks: From Mechanistic Electrocatalysis Models to System Design journal December 2018
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Heteroatom-doped carbon materials and their composites as electrocatalysts for CO 2 reduction journal January 2018
Simultaneous Achieving of High Faradaic Efficiency and CO Partial Current Density for CO 2 Reduction via Robust, Noble‐Metal‐Free Zn Nanosheets with Favorable Adsorption Energy journal April 2019
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Cu 2 O Nanoparticles with Both {100} and {111} Facets for Enhancing the Selectivity and Activity of CO 2 Electroreduction to Ethylene journal March 2020

Figures / Tables (4)