000843751 001__ 843751 000843751 005__ 20240711101547.0 000843751 0247_ $$2doi$$a10.1149/2.0991805jes 000843751 0247_ $$2ISSN$$a0013-4651 000843751 0247_ $$2ISSN$$a0096-4743 000843751 0247_ $$2ISSN$$a0096-4786 000843751 0247_ $$2ISSN$$a1945-7111 000843751 0247_ $$2Handle$$a2128/18245 000843751 0247_ $$2WOS$$aWOS:000431803900133 000843751 037__ $$aFZJ-2018-01303 000843751 082__ $$a540 000843751 1001_ $$0P:(DE-Juel1)129946$$aWippermann, Klaus$$b0$$eCorresponding author$$ufzj 000843751 245__ $$aIn Situ Determination of the Water Content of Ionic Liquids 000843751 260__ $$aPennington, NJ$$bElectrochemical Soc.$$c2018 000843751 3367_ $$2DRIVER$$aarticle 000843751 3367_ $$2DataCite$$aOutput Types/Journal article 000843751 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1524550044_25917 000843751 3367_ $$2BibTeX$$aARTICLE 000843751 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000843751 3367_ $$00$$2EndNote$$aJournal Article 000843751 520__ $$aThis study examines the applicability of electrochemical methods to the in situ determination of the water content in proton-conducting ionic liquids (PILs). Two proton-conducting ionic liquids with different acidities and hygroscopicities of the cations, sulfoethylmethylammonium trifluoromethanesulfonate, [2-Sema][TfO] and N,N-diethylmethylammonium trifluoromethanesulfonate, [Dema][TfO], were used. At first, PIL water electrolytes with known water concentrations ([2-Sema][TfO]: 0.64-6.1 wt%, [Dema][TfO]: 0.18-99.5 wt%) were prepared. Then, the influence of the water content on the electrochemical properties, namely the electrical conductivity, charge of hydrogen oxidation, charge of Pt oxide reduction and onset potential of Pt oxidation, were investigated. The four parameters were plotted as a function of the water concentration and fitted by exponential, linear or asymptotic functions. These fits serve as calibration curves that can be used to determine the actual water concentration by measuring one or more of the four parameters investigated. It was found that the measurement of specific ion conductivity is a fast and simple method across a wide range of water concentrations. The evaluation of the Pt oxide reduction charge from cyclic voltammograms is more time-consuming, but provides higher accuracy at low water concentrations, although the accuracy also depends on the nature of the ionic liquid. 000843751 536__ $$0G:(DE-HGF)POF3-135$$a135 - Fuel Cells (POF3-135)$$cPOF3-135$$fPOF III$$x0 000843751 588__ $$aDataset connected to CrossRef 000843751 7001_ $$0P:(DE-Juel1)129938$$aGiffin, Jürgen$$b1$$ufzj 000843751 7001_ $$0P:(DE-Juel1)140525$$aKorte, Carsten$$b2$$ufzj 000843751 773__ $$0PERI:(DE-600)2002179-3$$a10.1149/2.0991805jes$$gVol. 165, no. 5, p. 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