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Microenvironments of Cu catalysts in zero-gap membrane electrode assembly for efficient CO2 electrolysis to C2+ products
Cited 14 time in
Web of Science
Cited 9 time in Scopus
- Authors
- Issue Date
- 2022-05
- Publisher
- Royal Society of Chemistry
- Citation
- Journal of Materials Chemistry A, Vol.10 No.19, pp.10363-10372
- Abstract
- A zero-gap membrane-electrode assembly (MEA) electrolyzer is a promising design for electrochemical CO2 reduction reactions (eCO(2)RRs), where gaseous CO2 is directly fed without catholyte. The zero-gap junction between the catalyst and the membrane can have distinct chemical environments and mass transfer properties from the conventional H-type cell but is rarely studied. In this work, we designed an integrated experimental-simulation study in MEA to understand the zero-gap junction and factors to determine the eCO(2)RR activity to multi-carbon production. We developed a simple synchronous ionomer/catalyst activation step under alkaline conditions to form jagged CuO nanoparticles whose unique morphological evolution facilitates the C2+ chemical production for the zero-gap MEA electrolyzer. Moreover, under gas-fed and high-current density conditions, computational fluid dynamics suggests that the mass transfer limitation of water as a proton source across the catalyst-membrane layer and cathode kinetic overpotential are critical to determining C2+ chemical production in the range of several micrometers. From the chemical-physical understanding, we achieved a high partial current density of 336.5 mA cm(-2) and a faradaic efficiency of 67.3% towards C2+ chemicals.
- ISSN
- 2050-7488
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