Promoting CO 2 Electroreduction to Multi‐Carbon Products by Hydrophobicity‐Induced Electro‐Kinetic Retardation
Advancing the performance of the Cu‐catalyzed electrochemical CO 2 reduction reaction (CO 2 RR) is crucial for its practical applications. Still, the wettable pristine Cu surface often suffers from low exposure to CO 2 , reducing the Faradaic efficiencies (FEs) and current densities for multi‐carbon...
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Veröffentlicht in: | Angewandte Chemie 2023-10, Vol.135 (41) |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Advancing the performance of the Cu‐catalyzed electrochemical CO
2
reduction reaction (CO
2
RR) is crucial for its practical applications. Still, the wettable pristine Cu surface often suffers from low exposure to CO
2
, reducing the Faradaic efficiencies (FEs) and current densities for multi‐carbon (C
2+
) products. Recent studies have proposed that increasing surface availability for CO
2
by cation‐exchange ionomers can enhance the C
2+
product formation rates. However, due to the rapid formation and consumption of *CO, such promotion in reaction kinetics can shorten the residence of *CO whose adsorption determines C
2+
selectivity, and thus the resulting C
2+
FEs remain low. Herein, we discover that the electro‐kinetic retardation caused by the strong hydrophobicity of quaternary ammonium group‐functionalized polynorbornene ionomers can greatly prolong the *CO residence on Cu. This unconventional electro‐kinetic effect is demonstrated by the increased Tafel slopes and the decreased sensitivity of *CO coverage change to potentials. As a result, the strongly hydrophobic Cu electrodes exhibit C
2+
Faradaic efficiencies of ≈90 % at a partial current density of 223 mA cm
−2
, more than twice of bare or hydrophilic Cu surfaces. |
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ISSN: | 0044-8249 1521-3757 |
DOI: | 10.1002/ange.202309875 |