Bicarbonate Electroreduction to Multicarbon Products Enabled by Cu/Ag Bilayer Electrodes and Tailored Microenviroments
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2022-09-18
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Wiley
Abstract
Bicarbonate electrolyzer can achieve the direct conversion of CO2 captured solutions that bypasses energy-intensive steps of CO2 regeneration and pressurization. However, only single carbon chemicals (i.e., CO, formate, CH4) were reported as the major products so far. Herein, we report bicarbonate conversion to multicarbon (C2+) products (i.e., acetate, ethylene, ethanol, propanol) on rationally designed Cu/Ag bilayer electrodes with bilayer cation- and anion-conducting ionomers. The in-situ generated CO2 was first reduced to CO on the Ag layer, followed by its favourable further reduction to C2+ products on the Cu layer, benefiting from the locally high concentration of CO. Through optimizing the bilayer configurations, metal compositions, ionomer types, and local hydrophobicity, we have created a microenvironment (high local pH, low water content, etc.) to enhance bicarbonate-to-C2+ conversions and suppress hydrogen evolution reaction. Subsequently, we achieved maximum C2+ FE of 41.6 ± 0.39% at a considerable current density of 100 mA cm−2 .
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This is the peer-reviewed version of the following article: Jungkuk Lee, Hengzhou Liu, and Wenzhen Li, "Bicarbonate Electroreduction to Multicarbon Products Enabled by
Cu/Ag Bilayer Electrodes and Tailored Microenviroments," ChemSusChem 2022, e202201329.
It has been published in final form at DOI: 10.1002/cssc.202201329.
This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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Posted with permission.