Experimental evidence of high pressure decoupling between charge transport and structural dynamics in a protic ionic glass-former View Full Text


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Article Info

DATE

2017-12

AUTHORS

Z. Wojnarowska, M. Rams-Baron, J. Knapik-Kowalczuk, A. Połatyńska, M. Pochylski, J. Gapinski, A. Patkowski, P. Wlodarczyk, M. Paluch

ABSTRACT

In this paper the relaxation dynamics of ionic glass-former acebutolol hydrochloride (ACB-HCl) is studied as a function of temperature and pressure by using dynamic light scattering and broadband dielectric spectroscopy. These unique experimental data provide the first direct evidence that the decoupling between the charge transport and structural relaxation exists in proton conductors over a wide T-P thermodynamic space, with the time scale of structural relaxation being constant at the liquid-glass transition (τα = 1000 s). We demonstrate that the enhanced proton transport, being a combination of intermolecular H+ hopping between cation and anion as well as tautomerization process within amide moiety of ACB molecule, results in a breakdown of the Stokes-Einstein relation at ambient and elevated pressure with the fractional exponent k being pressure dependent. The dT g /dP coefficient, stretching exponent βKWW and dynamic modulus E a /ΔV # were found to be the same regardless of the relaxation processes studied. This is in contrast to the apparent activation volume parameter that is different when charge transport and structural dynamics are considered. These experimental results together with theoretical considerations create new ideas to design efficient proton conductors for potential electrochemical applications. More... »

PAGES

7084

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-017-07136-5

DOI

http://dx.doi.org/10.1038/s41598-017-07136-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090934665

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28765639


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