Achieving enhanced ionic mobility in nanoporous silica by controlled surface interactions
Artikel i vetenskaplig tidskrift, 2017

We report a strategy to enhance the ionic mobility in an emerging class of gels, based on robust nanoporous silica micro-particles, by chemical functionalization of the silica surface. Two very different ionic liquids are used to fill the nano-pores of silica at varying pore filling factors, namely one aprotic imidazolium based (1-methyl-3-hexylimidazolium bis(trifluoromethanesulfonyl)imide, C6C1ImTFSI), and one protic ammonium based (diethylmethylammonium methanesulfonate, DEMAOMs) ionic liquid. Both these ionic liquids display higher ionic mobility when confined in functionalized silica as compared to untreated silica nano-pores, an improvement that is more pronounced at low pore filling factors (i.e. in the nano-sized pore domains) and observed in the whole temperature window investigated (i.e. from −10 to 140 °C). Solid-state NMR, diffusion NMR and dielectric spectroscopy concomitantly demonstrate this effect. The origin of this enhancement is explained in terms of weaker intermolecular interactions and a consequent flipped-ion effect at the silica interface strongly supported by 2D solid-state NMR experiments. The possibility to significantly enhance the ionic mobility by controlling the nature of surface interactions is extremely important in the field of materials science and highlights these structurally tunable gels as promising solid-like electrolytes for use in energy relevant devices. These include, but are not limited to, Li-ion batteries and proton exchange membrane (PEM) fuel cells.

Författare

[Person 2c4a9e4a-2690-4764-8b1d-fe22401900a2 not found]

Chalmers, Kemi och kemiteknik, Tillämpad kemi

[Person 86fa80b5-0337-4b0a-a841-d104485b82d8 not found]

Chalmers, Kemi och kemiteknik, Tillämpad kemi

[Person 7d435cda-e71d-4c20-a1ff-b3ccbc16a906 not found]

Chalmers, Fysik, Kondenserade materiens fysik

[Person 31081e73-2a7c-4f2a-b674-4d31517a53c5 not found]

Chalmers, Fysik, Kondenserade materiens fysik

[Person aae66532-ec85-45cd-b391-40f7af27d086 not found]

Akzo Nobel - Pulp and Performance Chemicals

[Person 9f7cccb1-adbe-4589-87fb-a021f6e5ce2a not found]

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

Vol. 19 8 5727-5736

Ämneskategorier

Fysikalisk kemi

Annan fysik

Kemi

Styrkeområden

Energi

Materialvetenskap

DOI

10.1039/C6CP07351D

Mer information

Senast uppdaterat

2022-04-06