Study of kinetics, equilibrium and isotope exchange in ion exchange systems. II

Cabicar, J.; Gosman, A.; Plicka, J.; Ştamberg, K.

doi:10.1007/bf02517649

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The activation energy, as estimated from fitting of the experimental data, is 58.4 kJ/mol. This value is apparently greater than the ion-exchange activation energy in ordinary aqueous solutions, which is about 5–20 kJ/mol. , On the other hand, it is comparable to the typical activation energy values for chemical exchange between solids and liquids, which are usually larger than 40 kJ/mol . Due to this high activation energy, the exchange rate is therefore strongly dependent on temperature.…”

Section: Results and Discussionmentioning

confidence: 69%

“…This value is apparently greater than the ion-exchange activation energy in ordinary aqueous solutions, which is about 5−20 kJ/mol. 34,35 On the a The value of k −1 = 0 Hz is given on the basis of the assumption that the exchange is negligible at room temperature; b The detection limit of the exchange rate k −1 is roughly estimated to be 2 Hz. The value of 0 here means the exchange k −1 ≤ 2 Hz at 300 K. other hand, it is comparable to the typical activation energy values for chemical exchange between solids and liquids, which are usually larger than 40 kJ/mol.…”

Section: Anion Exchange Between Doped Htf and Gtfmentioning

confidence: 99%

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Probing Ion Exchange in the Triflic Acid–Guanidinium Triflate System: A Solid-State Nuclear Magnetic Resonance Study

2014

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Knowledge of ion exchange and transport behavior in electrolyte materials is crucial for designing and developing novel electrolytes for electrochemical device applications such as fuel cells or batteries. In the present study, we show that, upon the addition of triflic acid (HTf) to the guanidinium triflate (GTf) solid-state matrix, several orders of magnitude enhancement in the proton conductivity can be achieved. The static 1 H and 19 F solid-state NMR results show that the addition of HTf has no apparent effect on local molecular mobility of the GTf matrix at room temperature. At higher temperatures, however, the HTf exhibits fast ion exchange with the GTf matrix. The exchange rate, as quantified by our continuum T 2 fitting analysis, increases with increasing temperature. The activation energy for the chemical exchange process was estimated to be 58.4 kJ/mol. It is anticipated that the solid-state NMR techniques used in this study may be also applied to other organic solid-state electrolyte systems to investigate their ion-exchange processes.

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Section: Results and Discussionmentioning

confidence: 69%

Section: Anion Exchange Between Doped Htf and Gtfmentioning

confidence: 99%