Journal ArticleDOI
CO2 electroreduction to ethylene via hydroxide-mediated copper catalysis at an abrupt interface
Cao-Thang Dinh,Thomas Burdyny,Golam Kibria,Ali Seifitokaldani,Christine M. Gabardo,F. Pelayo García de Arquer,Amirreza Kiani,Jonathan P. Edwards,Phil De Luna,Oleksandr S. Bushuyev,Chengqin Zou,Chengqin Zou,Rafael Quintero-Bermudez,Yuanjie Pang,David Sinton,Edward H. Sargent +15 more
TLDR
A copper electrocatalyst at an abrupt reaction interface in an alkaline electrolyte reduces CO2 to ethylene with 70% faradaic efficiency at a potential of −0.55 volts versus a reversible hydrogen electrode (RHE).Abstract:
Carbon dioxide (CO 2 ) electroreduction could provide a useful source of ethylene, but low conversion efficiency, low production rates, and low catalyst stability limit current systems. Here we report that a copper electrocatalyst at an abrupt reaction interface in an alkaline electrolyte reduces CO 2 to ethylene with 70% faradaic efficiency at a potential of −0.55 volts versus a reversible hydrogen electrode (RHE). Hydroxide ions on or near the copper surface lower the CO 2 reduction and carbon monoxide (CO)–CO coupling activation energy barriers; as a result, onset of ethylene evolution at −0.165 volts versus an RHE in 10 molar potassium hydroxide occurs almost simultaneously with CO production. Operational stability was enhanced via the introduction of a polymer-based gas diffusion layer that sandwiches the reaction interface between separate hydrophobic and conductive supports, providing constant ethylene selectivity for an initial 150 operating hours.read more
Citations
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Journal ArticleDOI
Electrocatalytic CO 2 reduction towards industrial applications
TL;DR: In this article , a review of the electrocatalytic CO2 reduction reaction (eCO2RR) for industrial applications is presented, focusing on potential industrial catalysts and potential industrial products.
Journal ArticleDOI
High‐Rate and Selective CO2 Electrolysis to Ethylene via Metal–Organic‐Framework‐Augmented CO2 Availability
Dae-Hyun Nam,Osama Shekhah,Adnan Ozden,Christopher McCallum,Fengwang Li,Xue Wang,Yan Wei Lum,Tae Kyung Lee,Jun Li,Joshua Wicks,Andrew Johnston,David Sinton,Mohamed Eddaoudi,Edward H. Sargent +13 more
Abstract: High‐rate conversion of carbon dioxide (CO2) to ethylene (C2H4) in the CO2 reduction reaction (CO2RR) requires fine control over the phase boundary of the gas diffusion electrode (GDE) to overcome the limit of CO2 solubility in aqueous electrolytes. Here, a metal–organic framework (MOF)‐functionalized GDE design is presented, based on a catalysts:MOFs:hydrophobic substrate materials layered architecture, that leads to high‐rate and selective C2H4 production in flow cells and membrane electrode assembly (MEA) electrolyzers. It is found that using electroanalysis and operando X‐ray absorption spectroscopy (XAS), MOF‐induced organic layers in GDEs augment the local CO2 concentration near the active sites of the Cu catalysts. MOFs with different CO2 adsorption abilities are used, and the stacking ordering of MOFs in the GDE is varied. While sputtering Cu on poly(tetrafluoroethylene) (PTFE) (Cu/PTFE) exhibits 43% C2H4 Faradaic efficiency (FE) at a current density of 200 mA cm−2 in a flow cell, 49% C2H4 FE at 1 A cm−2 is achieved on MOF‐augmented GDEs in CO2RR. MOF‐augmented GDEs are further evaluated in an MEA electrolyzer, achieving a C2H4 partial current density of 220 mA cm−2 for CO2RR and 121 mA cm−2 for the carbon monoxide reduction reaction (CORR), representing 2.7‐fold and 15‐fold improvement in C2H4 production rate, compared to those obtained on bare Cu/PTFE.
Journal ArticleDOI
Probing dissolved CO2(aq) in aqueous solutions for CO2 electroreduction and storage
Jiachen Li,Jinyu Guo,Hongjie Dai +2 more
TL;DR: In this paper , microscale infrared spectroscopy was used for in situ dynamic quantification of CO2(aq) in aqueous solutions, and the quantized CO 2(g) rotational state transitions were observed to quench for CO2, accompanied by increased H2O IR absorption.
Journal ArticleDOI
Exploration of the bio-analogous asymmetric C–C coupling mechanism in tandem CO2 electroreduction
Chubai Chen,Sunmoon Yu,Yao Yang,Sheena Louisia,In-Bae Roh,Jianbo Jin,Shouping Chen,Peng-Cheng Chen,Yu-hua Shan,Peidong Yang +9 more
Journal ArticleDOI
Photocatalytic Hedgehog Particles for High Ionic Strength Environments.
TL;DR: In this article, hedgehog particles with semiconductor nanoscale spikes display enhanced stability in solutions of monovalent/divalent salts in both aqueous and hydrophobic media.
References
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