CO2 electroreduction to ethylene via hydroxide-mediated copper catalysis at an abrupt interface

Science
Cao-Thang DinhThomas Burdyny

Abstract

Carbon dioxide (CO2) 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 CO2 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 CO2 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.

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Citations

May 19, 2018·Science·Joel W Ager, Alexei A Lapkin
Jul 20, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Mark R DowsettAlison Parkin
Sep 22, 2018·Chemical Communications : Chem Comm·Shenghong ZhongLain-Jong Li
Oct 29, 2018·Advanced Materials·Jing-Jing LvFeng Jiao
Mar 29, 2019·Proceedings of the National Academy of Sciences of the United States of America·Tran Ngoc HuanVictor Mougel
May 9, 2019·Chemical Communications : Chem Comm·Pranit IyengarRaffaella Buonsanti
Sep 19, 2019·Physical Chemistry Chemical Physics : PCCP·Yuefeng ZhangJianmin Ma
Nov 7, 2018·Nature Communications·Jun LiDavid Sinton
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Nov 21, 2019·Nature·Fengwang LiEdward H Sargent
Aug 25, 2019·Nature Chemistry·Matthew JounyFeng Jiao
Sep 7, 2019·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Seunghwa LeeJaeyoung Lee
Feb 27, 2020·Nature Materials·Dae-Hyun NamEdward H Sargent
Aug 12, 2020·Chemical Society Reviews·Young Jin SaYun Jeong Hwang
Aug 25, 2020·Advanced Materials·Changming ZhaoYuen Wu
Jul 27, 2020·Angewandte Chemie·Louisa Rui Ling TingBoon Siang Yeo

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