Electroreduction of CO to 2.8 A cm⁻2 C2+ Products: Maximizing Efficiency with Minimalist Electrode Design Featuring a Mesopore‐Rich Hydrophobic Copper Catalyst Layer

Autor: Silu Chen, Ben Rowley, Ramesha Ganganahalli, Boon Siang Yeo
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Advanced Science, Vol 11, Iss 40, Pp n/a-n/a (2024)
Druh dokumentu: article
ISSN: 2198-3844
68708645
DOI: 10.1002/advs.202405938
Popis: Abstract This work shows how hydrophobicity and porosity can be incorporated into copper catalyst layers (CLs) for the efficient electroreduction of CO (CORR) in a flow cell. Oxide‐derived (OD) Cu catalysts are synthesized using K+ and Cs+ as templates, termed respectively as OD‐Cu‐K and OD‐Cu‐Cs. CLs, assembled from OD‐Cu‐K and OD‐Cu‐Cs, exhibit enhanced CORR performance compared to “unmodified” OD‐Cu CL. OD‐Cu‐Cs can notably reduce CO to C2+ products with Faradaic efficiencies (FE) as high as 96% (or 4% FE H2). During CO electrolysis at −3000 mA cm−2 (−0.73 V vs reversible hydrogen electrode), C2+ products and the alcohols are formed with respective current densities of −2804 and −1205 mA cm−2. The mesopores in the OD‐Cu‐Cs CL act as barriers against electrolyte flooding. Contact angle measurements confirm the CL's hydrophobicity ranking: OD‐Cu‐Cs > OD‐Cu‐K > OD‐Cu. The enhanced hydrophobicity of a catalyst is proposed to allow more triple‐phase (CO‐electrolyte‐catalyst) interfaces to be available for CORR. This study shows how the pore size‐hydrophobicity relationship can be harvested to guide the design of a less‐is‐more Cu electrode, which can attain high CORR current density and selectivity, without the additional use of hydrophobic polytetrafluoroethylene particles or dopants, such as Ag.
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