Selective CO2 Electroreduction to Ethylene and Multicarbon Alcohols via Electrolyte‐Driven Nanostructuring
Open Access
- 2 September 2019
- journal article
- research article
- Published by Wiley in Angewandte Chemie International Edition
- Vol. 58 (47) , 17047-17053
Abstract
Production of multicarbon products (C2+) from CO2 electroreduction reaction (CO2RR) is highly desirable for storing renewable energy and reducing carbon emission. The electrochemical synthesis of CO2RR catalysts that are highly selective for C2+ products via electrolyte‐driven nanostructuring is presented. Nanostructured Cu catalysts synthesized in the presence of specific anions selectively convert CO2 into ethylene and multicarbon alcohols in aqueous 0.1 m KHCO3 solution, with the iodine‐modified catalyst displaying the highest Faradaic efficiency of 80 % and a partial geometric current density of ca. 31.2 mA cm−2 for C2+ products at −0.9 V vs. RHE. Operando X‐ray absorption spectroscopy and quasi in situ X‐ray photoelectron spectroscopy measurements revealed that the high C2+ selectivity of these nanostructured Cu catalysts can be attributed to the highly roughened surface morphology induced by the synthesis, presence of subsurface oxygen and Cu+ species, and the adsorbed halides.Keywords
Funding Information
- H2020 European Research Council (ERC-OPERANDOCAT (ERC-725915))
- Bundesministerium für Forschung, Technologie und Raumfahrt (03SF0523C-'CO2EKAT', 033RCOO4D-'e-Ethylene')
- Deutsche Forschungsgemeinschaft (EXC 2008/1- 390540038'UniSysCat')
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