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Title: Switching CO2 Electroreduction Selectivity Between C1 and C2 Hydrocarbons on Cu Gas-Diffusion Electrodes

Journal Article · · Energy & Environmental Materials
DOI:https://doi.org/10.1002/eem2.12307· OSTI ID:1890212
ORCiD logo [1];  [2];  [3];  [2];  [4];  [5];  [3]; ORCiD logo [3];  [2]
  1. Hefei University of Technology (China); University of Cincinnati, OH (United States)
  2. University of Cincinnati, OH (United States)
  3. Hefei University of Technology (China)
  4. Arizona State University, Tempe, AZ (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

We report that regulating the selectivity toward a target hydrocarbon product is still the focus of CO2 electroreduction. Here, we discover that the original surface Cu species in Cu gas-diffusion electrodes plays a more important role than the surface roughness, local pH, and facet in governing the selectivity toward C1 or C2 hydrocarbons. The selectivity toward C2H4 progressively increases, while CH4 decreases steadily upon lowering the Cu oxidation species fraction. At a relatively low electrodeposition voltage of 1.5 V, the Cu gas-diffusion electrode with the highest Cuδ+/Cu0 ratio favors the pathways of hydrogenation to form CH4 with maximum Faradaic efficiency of 65.4% and partial current density of 228 mA cm-2 at -0.83 V vs RHE. At 2.0 V, the Cu gas-diffusion electrode with the lowest Cuδ+/Cu0 ratio prefers C–C coupling to form C2+ products with Faradaic efficiency topping 80.1% at -0.75 V vs RHE, where the Faradaic efficiency of C2H4 accounts for 46.4% and the partial current density of C2H4 achieves 279 mA cm-2. This work demonstrates that the selectivity from CH4 to C2H4 is switchable by tuning surface Cu species composition of Cu gas-diffusion electrodes.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); Central Universities; Key R&D Projects of Anhui Province; Arizona State University
Grant/Contract Number:
SC0012704; CBET-2033343; 52172293; 51772072; 51672065; JZ2021HGQB0282; PA2021GDSK0088; 202104b11020016; NNCI-ECCS-1542160
OSTI ID:
1890212
Report Number(s):
BNL-223518-2022-JAAM
Journal Information:
Energy & Environmental Materials, Vol. 6, Issue 2; ISSN 2575-0356
Publisher:
Wiley - Zhengzhou UniversityCopyright Statement
Country of Publication:
United States
Language:
English

References (52)

Facet Dependence of CO 2 Reduction Paths on Cu Electrodes journal December 2015
Operando time-resolved X-ray absorption spectroscopy reveals the chemical nature enabling highly selective CO2 reduction journal July 2020
Cooperative CO2-to-ethanol conversion via enriched intermediates at molecule–metal catalyst interfaces journal December 2019
Efficient Methane Electrosynthesis Enabled by Tuning Local CO 2 Availability journal January 2020
Manipulating the Hydrocarbon Selectivity of Copper Nanoparticles in CO 2 Electroreduction by Process Conditions journal December 2014
Morphology Matters: Tuning the Product Distribution of CO 2 Electroreduction on Oxide-Derived Cu Foam Catalysts journal May 2016
Constraining CO coverage on copper promotes high-efficiency ethylene electroproduction journal November 2019
On the Oxidation State of Cu 2 O upon Electrochemical CO 2 Reduction: An XPS Study journal July 2019
Controllable Hydrocarbon Formation from the Electrochemical Reduction of CO 2 over Cu Nanowire Arrays journal April 2016
Nanoporous Copper–Silver Alloys by Additive-Controlled Electrodeposition for the Selective Electroreduction of CO 2 to Ethylene and Ethanol journal April 2018
Subsurface oxide plays a critical role in CO 2 activation by Cu(111) surfaces to form chemisorbed CO 2 , the first step in reduction of CO 2 journal June 2017
Controlling the Oxidation State of the Cu Electrode and Reaction Intermediates for Electrochemical CO 2 Reduction to Ethylene journal January 2020
Tandem Electrodes for Carbon Dioxide Reduction into C2+ Products at Simultaneously High Production Efficiency and Rate journal April 2020
Understanding Surface-Mediated Electrochemical Reactions: CO 2 Reduction and Beyond journal July 2018
Controlling the selectivity of CO2 electroreduction on copper: The effect of the electrolyte concentration and the importance of the local pH journal February 2016
Progress and Perspectives of Electrochemical CO 2 Reduction on Copper in Aqueous Electrolyte journal April 2019
Spectroscopic Observation of Reversible Surface Reconstruction of Copper Electrodes under CO 2 Reduction journal May 2017
A review of the aqueous electrochemical reduction of CO2 to hydrocarbons at copper journal August 2006
Improved CO2 reduction activity towards C2+ alcohols on a tandem gold on copper electrocatalyst journal October 2018
CO 2 Reduction on Copper’s Twin Boundary journal January 2020
Electrochemical CO 2 reduction on Cu 2 O-derived copper nanoparticles: controlling the catalytic selectivity of hydrocarbons journal January 2014
Selective increase in CO 2 electroreduction activity at grain-boundary surface terminations journal November 2017
Electrochemical Reduction of CO 2 Toward C 2 Valuables on Cu@Ag Core‐Shell Tandem Catalyst with Tunable Shell Thickness journal August 2021
Grain-Boundary-Dependent CO 2 Electroreduction Activity journal April 2015
Electrochemically converting carbon monoxide to liquid fuels by directing selectivity with electrode surface area journal June 2019
Electrochemical Reduction of CO 2 Using Copper Single-Crystal Surfaces: Effects of CO* Coverage on the Selective Formation of Ethylene journal February 2017
Highly Dense Cu Nanowires for Low-Overpotential CO2 Reduction journal September 2015
Dual-Facet Mechanism in Copper Nanocubes for Electrochemical CO 2 Reduction into Ethylene journal July 2019
Morphology-Directed Selective Production of Ethylene or Ethane from CO 2 on a Cu Mesopore Electrode journal December 2016
Selective Electrochemical Reduction of Carbon Dioxide to Ethylene and Ethanol on Copper(I) Oxide Catalysts journal March 2015
Advances and challenges in understanding the electrocatalytic conversion of carbon dioxide to fuels journal September 2019
Tailoring Copper Nanocrystals towards C 2 Products in Electrochemical CO 2 Reduction journal April 2016
Active and Selective Ensembles in Oxide-Derived Copper Catalysts for CO 2 Reduction journal September 2020
Time-resolved observation of C–C coupling intermediates on Cu electrodes for selective electrochemical CO 2 reduction journal January 2020
How copper catalyzes the electroreduction of carbon dioxide into hydrocarbon fuels journal January 2010
Calculation for the cathode surface concentrations in the electrochemical reduction of CO2 in KHCO3 solutions journal October 2005
Formation of Copper Catalysts for CO 2 Reduction with High Ethylene/Methane Product Ratio Investigated with In Situ X-ray Absorption Spectroscopy journal April 2016
Synergistic enhancement of electrocatalytic CO2 reduction to C2 oxygenates at nitrogen-doped nanodiamonds/Cu interface journal January 2020
Highly selective plasma-activated copper catalysts for carbon dioxide reduction to ethylene journal June 2016
Electrochemical CO2-to-ethylene conversion on polyamine-incorporated Cu electrodes journal December 2020
Potential Dependence of the Local pH in a CO2 Reduction Electrolyzer journal December 2020
Controllable CO adsorption determines ethylene and methane productions from CO2 electroreduction journal January 2021
Mixed Copper States in Anodized Cu Electrocatalyst for Stable and Selective Ethylene Production from CO 2 Reduction journal June 2018
Strategies in catalysts and electrolyzer design for electrochemical CO 2 reduction toward C 2+ products journal February 2020
Enhance CO2-to-C2+ products yield through spatial management of CO transport in Cu/ZnO tandem electrodes journal July 2020
The role of in situ generated morphological motifs and Cu(i) species in C2+ product selectivity during CO2 pulsed electroreduction journal March 2020
A new mechanism for the selectivity to C1 and C2 species in the electrochemical reduction of carbon dioxide on copper electrodes journal January 2011
Accelerated discovery of CO2 electrocatalysts using active machine learning journal May 2020
pH effects on the electrochemical reduction of CO(2) towards C2 products on stepped copper journal January 2019
Oxidation State and Surface Reconstruction of Cu under CO 2 Reduction Conditions from In Situ X-ray Characterization journal December 2020
Operando Spectroscopic Investigation of a Boron-Doped CuO Catalyst and Its Role in Selective Electrochemical C–C Coupling journal November 2020
Tuning the Catalytic Activity and Selectivity of Cu for CO 2 Electroreduction in the Presence of Halides journal February 2016

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