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000889820 1001_ $$0P:(DE-Juel1)129946$$aWippermann, Klaus$$b0$$eCorresponding author$$ufzj
000889820 245__ $$aOxygen reduction reaction kinetics on Pt in mixtures of proton conducting ionic liquids (PILs) and water: The influence of cation acidity
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000889820 520__ $$aThe aim of this study is to investigate the effect of the acidity of proton-conducting ionic liquids (PILs) on the oxygen reduction reaction (ORR) kinetics at polycrystalline platinum electrodes. Three PILs ([2-SEMA][TfO], [1-EIm][TfO], and [DEMA][TfO]) with different cation acidities (aqueous pKa = 0.94, 7.30 and 10.55) are investigated. The ORR kinetics are evaluated by simulating cyclic voltammograms recorded under an oxygen atmosphere. An associative mechanism, including H3O+ as the dominant proton donor, is used for the simulations. The dependencies of the rate constants k1 and the charge transfer coefficients α1 of the r.d.s. (O2 + e– → O2–) on the cation acidity, the water content (≈3–50 mol %), and the temperature (30–90 °C) are analyzed. The rate constant k1, the pre-exponential factor of k1, and the current density are observed to increase with the acidity of the PIL cation, whereas α1 shows the opposite behavior. At low water concentrations, the [2-SEMA+] cation is a remarkably good proton donor in ORR, contrary to the former results obtained from the HUPD reaction. This leads to a minimum of ≈30 mol % in the plots of the current density and k1 vs the water content, which correlates with a similar dependency of the pseudo capacitance C2.
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000889820 7001_ $$0P:(DE-Juel1)172823$$aSuo, Yanpeng$$b1$$ufzj
000889820 7001_ $$0P:(DE-Juel1)140525$$aKorte, Carsten$$b2$$ufzj
000889820 773__ $$0PERI:(DE-600)2256522-X$$a10.1021/acs.jpcc.0c11374$$gVol. 125, no. 8, p. 4423 - 4435$$n8$$p4423 - 4435$$tThe journal of physical chemistry <Washington, DC> / C$$v125$$x1932-7447$$y2021
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000889820 8564_ $$uhttps://juser.fz-juelich.de/record/889820/files/Influence%20of%20PIL%20Acidity%20Supporting%20Information%20Revised.pdf$$yPublished on 2021-02-18. Available in OpenAccess from 2022-02-18.
000889820 8564_ $$uhttps://juser.fz-juelich.de/record/889820/files/Influence%20of%20PIL%20acidity%20on%20the%20ORR%20kinetics%20Revised%20Manuscript.pdf$$yPublished on 2021-02-18. Available in OpenAccess from 2022-02-18.
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