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dc.contributor.authorKhan, Sami
dc.contributor.authorHwang, Jonathan
dc.contributor.authorHorn, Yang-Shao
dc.contributor.authorVaranasi, Kripa K
dc.date.accessioned2022-01-26T18:21:54Z
dc.date.available2022-01-26T18:21:54Z
dc.date.issued2021
dc.identifier.urihttps://hdl.handle.net/1721.1/139748
dc.description.abstract© 2020 The Author(s) Electrochemical reduction of carbon dioxide (CO2RR) is an attractive approach toward converting CO2 to solar fuels. Novel catalyst chemistries and morphologies may provide high selectivity to both one-carbon (C1) and two-carbon (C2) products over hydrogen; however, the limited aqueous solubility of CO2 restricts the CO2RR current density. Here, we demonstrate how gasphilic bubble-trap surfaces enhance mass transfer and enrich and maintain CO2 concentration during CO2RR by forming a catalyst-proximal plastron layer, consequently increasing the CO2RR activity on both smooth and nanostructured copper as compared to the conventional headspace or bubbling modes of CO2 delivery. The H2 Faradaic efficiency is suppressed from 33% to 13% on smooth copper and from 62% to 33% on nanostructured copper, accompanied by enhanced formation of C2+ products, including ethylene, propanol, and ethanol, and >1% acetone and acetate. We highlight the importance of the catalyst-proximal plastron approach by comparing against recent aqueous-phase CO2RR studies. Khan et al. report how bubble-capturing surfaces can enhance electrocatalytic reduction of CO2 by local supersaturation of CO2 in the electrolyte near the catalyst, overcoming mass transport limitations. Thereby, hydrogen co-evolution is suppressed and formation of attractive C2+ products, such as ethanol and ethylene, is increased.en_US
dc.language.isoen
dc.publisherElsevier BVen_US
dc.relation.isversionof10.1016/J.XCRP.2020.100318en_US
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs Licenseen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.sourceElsevieren_US
dc.titleCatalyst-proximal plastrons enhance activity and selectivity of carbon dioxide electroreductionen_US
dc.typeArticleen_US
dc.identifier.citationKhan, Sami, Hwang, Jonathan, Horn, Yang-Shao and Varanasi, Kripa K. 2021. "Catalyst-proximal plastrons enhance activity and selectivity of carbon dioxide electroreduction." Cell Reports Physical Science, 2 (2).
dc.contributor.departmentMassachusetts Institute of Technology. Department of Materials Science and Engineering
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineering
dc.relation.journalCell Reports Physical Scienceen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2022-01-26T17:55:24Z
dspace.orderedauthorsKhan, S; Hwang, J; Horn, Y-S; Varanasi, KKen_US
dspace.date.submission2022-01-26T17:55:26Z
mit.journal.volume2en_US
mit.journal.issue2en_US
mit.licensePUBLISHER_CC
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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