Publisher DOI: 10.1103/PhysRevMaterials.4.055401
arXiv ID: 2005.02851v1
Title: Ionic liquid dynamics in nanoporous carbon : a pore-size- and temperature-dependent neutron spectroscopy study on supercapacitor materials
Language: English
Authors: Busch, Mark  
Hofmann, Tommy 
Frick, Bernhard 
Embs, Jan P. 
Dyatkin, Boris 
Huber, Patrick 
Keywords: Materials Science;Soft Condensed Matter;Quasi-elastic neutron scattering;ionic liquids;carbide-derived carbons;nanoporous carbon;self-diffusion dynamics;nanoconfinement
Issue Date: 6-May-2020
Publisher: AIP
Source: Phys. Rev. Materials 4, 055401 (2020) - Editors' Suggestion 5 (4): - (2020)
Journal or Series Name: Physical review materials 
Is supplemented by: 10.5291/ILL-DATA.6-02-558
Abstract (english): The influence of spatial confinement on the thermally excited stochastic cation dynamics of the room-temperature ionic liquid 1-N-butylpyridinium bis-((trifluoromethyl)sulfonyl)imide ([BuPy][Tf₂N]) inside porous carbide-derived carbons with various pore sizes in the sub- to a few nanometer range are investigated by quasi-elastic neutron spectroscopy. Using the potential of fixed window scans, i.e. scanning a sample parameter, while observing solely one specific energy transfer value, an overview of the dynamic landscape within a wide temperature range is obtained. It is shown that already these data provide a quite comprehensive understanding of the confinement-induced alteration of the molecular mobility in comparison to the bulk. A complementary, more detailed analysis of full energy transfer spectra at selected temperatures reveals two translational diffusive processes on different time scales. Both are considerably slower than in the bulk liquid and show a decrease of the respective self-diffusion coefficients with decreasing nanopore size. Different thermal activation energies for molecular self-diffusion in nanoporous carbons with similar pore size indicate the importance of pore morphology on the molecular mobility, beyond the pure degree of confinement. In spite of the dynamic slowing down we can show that the temperature range of the liquid state upon nanoconfinement is remarkably extended to much lower temperatures, which is beneficial for potential technical applications of such systems.
ISSN: 2475-9953
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
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