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Title: Correlating Oxidation State and Surface Area to Activity from Operando Studies of Copper CO Electroreduction Catalysts in a Gas-Fed Device

Journal Article · · ACS Catalysis

Copyright © 2020 American Chemical Society. The rational design of high-performance electrocatalysts requires a detailed understanding of dynamic changes in catalyst properties, including oxidation states, surface area, and morphology under realistic working conditions. Oxide-derived Cu catalysts exhibit a remarkable selectivity toward multicarbon products for the electrochemical CO reduction reaction (CORR), but the exact role of the oxide remains elusive for explaining the performance enhancements. Here, we used operando X-ray absorption spectroscopy (XAS) coupled with simultaneous measurements of the catalyst activity and selectivity by gas chromatography (GC) to study the relationship between oxidation states of Cu-based catalysts and the activity for ethylene (C2H4) production in a CO gas-fed cell. By utilizing a custom-built XAS cell, oxidation states of Cu catalysts can be probed in device-relevant settings and under high current densities (>80 mA cm-2) for the CORR. By employing an electrochemical oxidation process, we found that the Cu oxidation states and specific ion species do not correlate with C2H4 production. The difference in the CORR activity is also investigated in relation to electrochemical surface area (ECSA) changes. While the hydrogen evolution reaction (HER) activity is positively correlated to the ECSA changes, the increased C2H4 activity is not proportional to the ECSA. Ex situ characterization from microscopic techniques suggests that the changes in the C2H4 activity and selectivity may arise from a morphological transformation that evolves into a more active structure. These comprehensive results give rise to the development of a cell regeneration method that can restore the performance of the Cu catalyst without cell disassembly. Our study establishes a basis for the rational design of highly active electrocatalysts for broad-range reactions in a gas-fed device.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; SC0004993
OSTI ID:
1764521
Journal Information:
ACS Catalysis, Vol. 10, Issue 14; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (53)

Si photocathode with Ag-supported dendritic Cu catalyst for CO 2 reduction journal January 2019
ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal June 2005
Electrochemical Carbon Monoxide Reduction on Polycrystalline Copper: Effects of Potential, Pressure, and pH on Selectivity toward Multicarbon and Oxygenated Products journal July 2018
Multilayer Electrolyzer Stack Converts Carbon Dioxide to Gas Products at High Pressure with High Efficiency journal June 2019
Copper adparticle enabled selective electrosynthesis of n-propanol journal November 2018
Electroreduction of Carbon Dioxide to Hydrocarbons Using Bimetallic Cu–Pd Catalysts with Different Mixing Patterns journal December 2016
What would it take for renewably powered electrosynthesis to displace petrochemical processes? journal April 2019
Electroreduction of carbon monoxide to liquid fuel on oxide-derived nanocrystalline copper journal April 2014
High-Rate Electrochemical Reduction of Carbon Monoxide to Ethylene Using Cu-Nanoparticle-Based Gas Diffusion Electrodes journal March 2018
Quantitative Speciation of Heavy Metals in Soils and Sediments by Synchrotron X-ray Techniques journal January 2002
Selective conversion of CO into ethanol on Cu(511) surface reconstructed from Cu(pc): Operando studies by electrochemical scanning tunneling microscopy, mass spectrometry, quartz crystal nanobalance, and infrared spectroscopy journal January 2020
Selective CO 2 Electroreduction to Ethylene and Multicarbon Alcohols via Electrolyte‐Driven Nanostructuring journal November 2019
Nanoporous Copper–Silver Alloys by Additive-Controlled Electrodeposition for the Selective Electroreduction of CO 2 to Ethylene and Ethanol journal April 2018
Sequential catalysis controls selectivity in electrochemical CO 2 reduction on Cu journal January 2018
Optimizing C–C Coupling on Oxide-Derived Copper Catalysts for Electrochemical CO 2 Reduction journal June 2017
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
On the Mechanism Underlying the Direct Conversion of Methane to Methanol by Copper Hosted in Zeolites; Braiding Cu K-Edge XANES and Reactivity Studies journal July 2018
Determination of Mn valence states in mixed-valent manganates by XANES spectroscopy journal May 2012
Probing the Active Surface Sites for CO Reduction on Oxide-Derived Copper Electrocatalysts journal July 2015
High Selectivity for Ethylene from Carbon Dioxide Reduction over Copper Nanocube Electrocatalysts journal February 2015
A Direct Grain-Boundary-Activity Correlation for CO Electroreduction on Cu Nanoparticles journal March 2016
Cu metal embedded in oxidized matrix catalyst to promote CO 2 activation and CO dimerization for electrochemical reduction of CO 2 journal June 2017
Initial and later stages of anodic oxide formation on Cu, chemical aspects, structure and electronic properties journal August 2001
Standards and Protocols for Data Acquisition and Reporting for Studies of the Electrochemical Reduction of Carbon Dioxide journal May 2018
Designing materials for electrochemical carbon dioxide recycling journal July 2019
High-rate electroreduction of carbon monoxide to multi-carbon products journal August 2018
Selective increase in CO 2 electroreduction activity at grain-boundary surface terminations journal November 2017
Reduction of Aqueous CO 2 to 1-Propanol at MoS 2 Electrodes journal June 2018
Electrochemical Reduction of CO at a Copper Electrode journal September 1997
Stability of Residual Oxides in Oxide-Derived Copper Catalysts for Electrochemical CO 2 Reduction Investigated with 18 O Labeling journal December 2017
Comparative Analysis of Solar-to-Fuel Conversion Efficiency: A Direct, One-Step Electrochemical CO 2 Reduction Reactor versus a Two-Step, Cascade Electrochemical CO 2 Reduction Reactor journal July 2018
Electrochemically converting carbon monoxide to liquid fuels by directing selectivity with electrode surface area journal June 2019
Plasma-Activated Copper Nanocube Catalysts for Efficient Carbon Dioxide Electroreduction to Hydrocarbons and Alcohols journal April 2017
A review of water flooding issues in the proton exchange membrane fuel cell journal March 2008
Catalyst electro-redeposition controls morphology and oxidation state for selective carbon dioxide reduction journal January 2018
Activation of Cu(111) surface by decomposition into nanoclusters driven by CO adsorption journal January 2016
A Hybrid Catalyst-Bonded Membrane Device for Electrochemical Carbon Monoxide Reduction at Different Relative Humidities journal September 2019
Selective Electrochemical Reduction of Carbon Dioxide to Ethylene and Ethanol on Copper(I) Oxide Catalysts journal March 2015
Investigating Electrode Flooding in a Flowing Electrolyte, Gas‐Fed Carbon Dioxide Electrolyzer journal December 2019
The Evolution of the Polycrystalline Copper Surface, First to Cu(111) and Then to Cu(100), at a Fixed CO 2 RR Potential: A Study by Operando EC-STM journal December 2014
Efficient electrocatalytic conversion of carbon monoxide to propanol using fragmented copper journal February 2019
Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction journal October 2013
How copper catalyzes the electroreduction of carbon dioxide into hydrocarbon fuels journal January 2010
Effects of Surface Roughness on the Electrochemical Reduction of CO 2 over Cu journal March 2020
Highly selective plasma-activated copper catalysts for carbon dioxide reduction to ethylene journal June 2016
CO 2 reduction on gas-diffusion electrodes and why catalytic performance must be assessed at commercially-relevant conditions journal January 2019
Dopant-induced electron localization drives CO2 reduction to C2 hydrocarbons journal July 2018
Design of an artificial photosynthetic system for production of alcohols in high concentration from CO 2 journal January 2016
Regulating the Product Distribution of CO Reduction by the Atomic-Level Structural Modification of the Cu Electrode Surface journal June 2016
A Perspective on Counting Catalytic Active Sites and Rates of Reaction Using X-Ray Spectroscopy journal October 2018
Potential-induced nanoclustering of metallic catalysts during electrochemical CO2 reduction journal August 2018
Liquid-Water Interactions with Gas-Diffusion-Layer Surfaces journal January 2014
Subsurface Oxygen in Oxide-Derived Copper Electrocatalysts for Carbon Dioxide Reduction journal December 2016