In:
Angewandte Chemie, Wiley, Vol. 135, No. 41 ( 2023-10-09)
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v135.41
DOI:
10.1002/ange.202309875
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
505868-5
detail.hit.zdb_id:
506609-8
detail.hit.zdb_id:
514305-6
detail.hit.zdb_id:
505872-7
detail.hit.zdb_id:
1479266-7
detail.hit.zdb_id:
505867-3
detail.hit.zdb_id:
506259-7
Permalink