Paramelaconite‐Enriched Copper‐Based Material as an Efficient and Robust Catalyst for Electrochemical Carbon Dioxide Reduction |
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Authors: | Nemanja Marti Christian Reller Chandra Macauley Mario Lffler Bernhard Schmid David Reinisch Elena Volkova Anna Maltenberger Andreas Rucki Karl J J Mayrhofer Günter Schmid |
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Institution: | Nemanja Martić,Christian Reller,Chandra Macauley,Mario Löffler,Bernhard Schmid,David Reinisch,Elena Volkova,Anna Maltenberger,Andreas Rucki,Karl J. J. Mayrhofer,Günter Schmid |
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Abstract: | A copper‐oxide‐based catalyst enriched with paramelaconite (Cu4O3) is presented and investigated as an electrocatalyst for facilitating electroreduction of CO2 to ethylene and other hydrocarbons. Cu4O3 is a member of the copper‐oxide family and possesses an intriguing mixed‐valance nature, incorporating an equal number of Cu+ and Cu2+ ions in its crystal structure. The material is synthesized using a solvothermal synthesis route and its structure is confirmed via powder X‐ray diffraction, transmission electron microscope based selected area electron diffraction, and X‐ray photoelectron spectroscopy. A flow reactor equipped with a gas diffusion electrode is utilized to test a copper‐based catalyst enriched with the Cu4O3 phase under CO2 reduction conditions. The Cu4O3‐rich catalyst (PrC) shows a Faradaic efficiency for ethylene over 40% at 400 mA cm?2. At ?0.64 versus reversible hydrogen electrode, the highest C2+/C1 product ratio of 4.8 is achieved, with C2+ Faradaic efficiency over 61%. Additionally, the catalyst exhibits a stable performance for 24 h at a constant current density of 200 mA cm?2. |
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Keywords: | carbon dioxide electroreduction Cu4O3 gas diffusion electrodes mixed‐valence paramelaconite |
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