Aprotic phosphonium‐based ionic liquid as electrolyte for high CO2 electroreduction to oxalateShow others and affiliations
2023 (English)In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 69, no 2, article id e17859Article in journal (Refereed) Published
Abstract [en]
In this study, a new CO2 electroreduction electrolyte system consisting of tetrabutylphosphonium 4-(methoxycarbonyl) phenol ([P4444][4-MF-PhO]) ionic liquid (IL) and acetonitrile (AcN) was designed to produce oxalate, and the electroreduction mechanism was studied. The results show that using the new IL-based electrolyte, the electroreduction system exhibits 93.8% Faradaic efficiency and 12.6 mA cm−2 partial current density of oxalate at −2.6 V. The formation rate of oxalate is 234.4 μmol cm−2 h−1, which is better than those reported in the literature. The mechanism study using density functional theory (DFT) calculations reveals that [P4444][4-MF-PhO] can effectively activate CO2 molecule through ester and phenoxy double active sites. In addition, in the phosphonium-based ionic environment, the potential barriers of the key intermediates *CO2− and *C2O42− are reduced by the induced electric field, which greatly facilitates the activation and conversion of CO2 molecule to oxalate.
Place, publisher, year, edition, pages
John Wiley & Sons, 2023. Vol. 69, no 2, article id e17859
Keywords [en]
aprotic, CO2 electroreduction, oxalate, phosphonium-based ionic liquid
National Category
Polymer Chemistry Condensed Matter Physics
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-92740DOI: 10.1002/aic.17859ISI: 000846452500001Scopus ID: 2-s2.0-85137232532OAI: oai:DiVA.org:ltu-92740DiVA, id: diva2:1692134
Note
Validerad;2023;Nivå 2;2023-04-19 (hanlid);
Funder: National Key R&D Program of China (2020YFA0710200); National Natural Science Foundation of China (21838010, 22122814); Innovation Academy for Green Manufacture (IAGM2020C14); Instrument Developing Project of the Chinese Academy of Sciences (YJKYYQ20200062)
2022-09-012022-09-012023-09-05Bibliographically approved