Show simple item record

dc.contributor.authorDoblinger, Simon
dc.contributor.authorDonati, Taylor
dc.contributor.authorSilvester-Dean, Debbie
dc.date.accessioned2022-07-15T06:58:13Z
dc.date.available2022-07-15T06:58:13Z
dc.date.issued2020
dc.identifier.citationDoblinger, S. and Donati, T.J. and Silvester, D.S. 2020. Effect of Humidity and Impurities on the Electrochemical Window of Ionic Liquids and Its Implications for Electroanalysis. Journal of Physical Chemistry C. 124 (37): pp. 20309-20319.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/88915
dc.identifier.doi10.1021/acs.jpcc.0c07012
dc.description.abstract

Replacing conventional aqueous-based electrolytes with room-temperature ionic liquids (RTILs) for electrochemical applications is a major research focus. However, in applications where RTILs are exposed to real-world environments, their hygroscopic nature affects their promising physicochemical properties, such as broad electrochemical windows (EWs) and high chemical stability. In this study, the electrochemical windows of nine commercially available RTILs have been determined on platinum thin-film electrodes in "dry"conditions (4.3-6.5 V) via cyclic voltammetry, and a systematic study over a wide humidity range (relative humidity (RH) between <1 and >95%) has been carried out. A significant reduction in the EW occurs even at low moisture contents (<10 RH%), which is especially evident for the most electrochemically stable ions in the study (i.e., [C4mpyrr]+, [FAP]-, and [NTf2]-). At saturated water levels, the electrochemical windows come close to that of water (approximately 2 V) regardless of the cation or anion structure, where the electrolyte behavior changes from "water-in-RTIL"to "RTIL-in-water."Additionally, the appearance of redox peaks from dissolved impurities inherent to the RTIL becomes more obvious with increasing water content. The effect of moisture on the electrochemical response of two model species where the presence of water does not alter the electrochemical mechanism, i.e., decamethylferrocene and ammonia, was also studied. For ammonia, the increase in current is not only caused by a change in the transport properties of the electrolyte (lower viscosity) but also by a shift in the anodic limit of the electrochemical window. This is believed to be the most detailed study of the effect of water on RTILs over a wide humidity range and emphasizes the importance of understanding the effect of water on voltammetric responses of dissolved species in RTILs under different environmental conditions.

dc.languageEnglish
dc.publisherAMER CHEMICAL SOC
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FT170100315
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectTechnology
dc.subjectChemistry, Physical
dc.subjectNanoscience & Nanotechnology
dc.subjectMaterials Science, Multidisciplinary
dc.subjectChemistry
dc.subjectScience & Technology - Other Topics
dc.subjectMaterials Science
dc.subjectOXYGEN REDUCTION REACTION
dc.subjectAMPEROMETRIC GAS SENSORS
dc.subjectELECTRIC DOUBLE-LAYER
dc.subjectTEMPERATURE
dc.subjectWATER
dc.subjectMIXTURES
dc.subjectAMMONIA
dc.subjectDENSITY
dc.subjectBIS(TRIFLUOROMETHYLSULFONYL)IMIDE
dc.subjectTETRAFLUOROBORATE
dc.titleEffect of Humidity and Impurities on the Electrochemical Window of Ionic Liquids and Its Implications for Electroanalysis
dc.typeJournal Article
dcterms.source.volume124
dcterms.source.number37
dcterms.source.startPage20309
dcterms.source.endPage20319
dcterms.source.issn1932-7447
dcterms.source.titleJournal of Physical Chemistry C
dc.date.updated2022-07-15T06:58:10Z
curtin.note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.0c07012.

curtin.departmentSchool of Molecular and Life Sciences (MLS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidSilvester-Dean, Debbie [0000-0002-7678-7482]
curtin.contributor.researcheridSilvester-Dean, Debbie [D-4679-2013]
dcterms.source.eissn1932-7455
curtin.contributor.scopusauthoridSilvester-Dean, Debbie [14623139100]


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record