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Title: Organic Additive‐derived Films on Cu Electrodes Promote Electrochemical CO 2 Reduction to C 2+ Products Under Strongly Acidic Conditions

Journal Article · · Angewandte Chemie

Abstract Electrochemical CO 2 reduction (CO 2 R) at low pH is desired for high CO 2 utilization; the competing hydrogen evolution reaction (HER) remains a challenge. High alkali cation concentration at a high operating current density has recently been used to promote electrochemical CO 2 R at low pH. Herein we report an alternative approach to selective CO 2 R (>70 % Faradaic efficiency for C 2+ products, FE C2+ ) at low pH (pH 2; H 3 PO 4 /KH 2 PO 4 ) and low potassium concentration ([K + ]=0.1 M) using organic film‐modified polycrystalline copper (Modified‐Cu). Such an electrode effectively mitigates HER due to attenuated proton transport. Modified‐Cu still achieves high FE C2+ (45 % with Cu foil /55 % with Cu GDE) under 1.0 M H 3 PO 4 (pH≈1) at low [K + ] (0.1 M), even at low operating current, conditions where HER can otherwise dominate.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0021266
OSTI ID:
1983396
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 12 Vol. 135; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (52)

CO 2 Reduction: From the Electrochemical to Photochemical Approach journal September 2017
Controllable Cu 0 ‐Cu + Sites for Electrocatalytic Reduction of Carbon Dioxide journal June 2021
Controllable Cu 0 ‐Cu + Sites for Electrocatalytic Reduction of Carbon Dioxide journal June 2021
pH dependence of OER activity of oxides: Current and future perspectives journal March 2016
Research progress of electrochemical CO2 reduction for copper-based catalysts to multicarbon products journal August 2021
Surface and Interface Engineering in Copper-Based Bimetallic Materials for Selective CO2 Electroreduction journal August 2018
Progress toward Commercial Application of Electrochemical Carbon Dioxide Reduction journal November 2018
Carbon Monoxide Gas Diffusion Electrolysis that Produces Concentrated C2 Products with High Single-Pass Conversion journal January 2019
Modulating Local CO2 Concentration as a General Strategy for Enhancing C−C Coupling in CO2 Electroreduction journal May 2020
Cascade CO2 electroreduction enables efficient carbonate-free production of ethylene journal March 2021
Address the “alkalinity problem” in CO2 electrolysis with catalyst design and translation journal April 2021
Carbonate resilience of flowing electrolyte-based alkaline fuel cells journal February 2011
An overview of current status of carbon dioxide capture and storage technologies journal November 2014
Molecular Electrochemical Reduction of CO2 beyond Two Electrons journal May 2021
Progress and Perspectives of Electrochemical CO 2 Reduction on Copper in Aqueous Electrolyte journal April 2019
Competition between Hydrogen Evolution and Carbon Dioxide Reduction on Copper Electrodes in Mildly Acidic Media journal May 2017
Enhancing CO2 Electroreduction Selectivity toward Multicarbon Products via Tuning the Local H2O/CO2 Molar Ratio journal September 2022
Effect and Prevention of Trace Ag + Contamination from Ag/AgCl Reference Electrodes on CO 2 Reduction Product Distributions at Polycrystalline Copper Electrodes journal October 2019
Investigation of Electrolyte-Dependent Carbonate Formation on Gas Diffusion Electrodes for CO2 Electrolysis journal March 2021
Selective CO2 Reduction to Ethylene Using Imidazolium-Functionalized Copper journal June 2022
Dramatic HER Suppression on Ag Electrodes via Molecular Films for Highly Selective CO 2 to CO Reduction journal March 2021
Impurity Ion Complexation Enhances Carbon Dioxide Reduction Catalysis journal June 2015
Mechanistic Understanding of CO 2 Reduction Reaction (CO2RR) Toward Multicarbon Products by Heterogeneous Copper-Based Catalysts journal December 2019
Breaking Scaling Relationships in CO2 Reduction on Copper Alloys with Organic Additives journal October 2021
CO 2 Reduction Selective for C ≥2 Products on Polycrystalline Copper with N-Substituted Pyridinium Additives journal July 2017
Recent Advances in Solar-Driven Carbon Dioxide Conversion: Expectations versus Reality journal May 2020
High-Rate and Efficient Ethylene Electrosynthesis Using a Catalyst/Promoter/Transport Layer journal August 2020
pH Matters When Reducing CO 2 in an Electrochemical Flow Cell journal September 2020
Electrochemical CO 2 Reduction to Ethanol with Copper-Based Catalysts journal January 2021
Electrocatalytic Reduction of Low Concentrations of CO2 Gas in a Membrane Electrode Assembly Electrolyzer journal September 2021
Cation-Driven Increases of CO2 Utilization in a Bipolar Membrane Electrode Assembly for CO2 Electrolysis journal November 2021
Downstream of the CO 2 Electrolyzer: Assessing the Energy Intensity of Product Separation journal November 2021
Suppression of Hydrogen Evolution in Acidic Electrolytes by Electrochemical CO 2 Reduction journal December 2020
Selective CO 2 Electrochemical Reduction Enabled by a Tricomponent Copolymer Modifier on a Copper Surface journal February 2021
The Role of Cation Acidity on the Competition between Hydrogen Evolution and CO 2 Reduction on Gold Electrodes journal December 2021
Catalyst Regeneration via Chemical Oxidation Enables Long-Term Electrochemical Carbon Dioxide Reduction journal July 2022
Promoter Effects of Alkali Metal Cations on the Electrochemical Reduction of Carbon Dioxide journal August 2017
Competition between CO 2 Reduction and Hydrogen Evolution on a Gold Electrode under Well-Defined Mass Transport Conditions journal February 2020
The future of low-temperature carbon dioxide electrolysis depends on solving one basic problem journal October 2020
Efficiency and selectivity of CO2 reduction to CO on gold gas diffusion electrodes in acidic media journal August 2021
Advances and challenges in understanding the electrocatalytic conversion of carbon dioxide to fuels journal September 2019
Molecular enhancement of heterogeneous CO2 reduction journal February 2020
Molecular tuning of CO2-to-ethylene conversion journal November 2019
Absence of CO2 electroreduction on copper, gold and silver electrodes without metal cations in solution journal July 2021
Electrocatalytic conversion of carbon dioxide for the Paris goals journal November 2021
Steering the structure and selectivity of CO2 electroreduction catalysts by potential pulses journal April 2022
Modulating electric field distribution by alkali cations for CO2 electroreduction in strongly acidic medium journal April 2022
Understanding cation effects in electrochemical CO 2 reduction journal January 2019
Electrochemical CO 2 reduction to methane with remarkably high Faradaic efficiency in the presence of a proton permeable membrane journal January 2020
Recent advances in engineering active sites for photocatalytic CO2 reduction journal January 2020
What would it take for renewably powered electrosynthesis to displace petrochemical processes? journal April 2019
CO 2 electrolysis to multicarbon products in strong acid journal June 2021