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Title: Di-ureasil hybrid electrolytes incorporating a new proton ionic liquid
Author: Cardoso, Marita A.
Leones, Rita
Rodrigues, Luisa C.
Fernandes, Mariana
Figueiredo, Filipe L.
Nunes, Sílvia C.
Silva, M. Manuela
Bermudez, Verónica de Zea
Keywords: Conducting materials
Di-ureasil hybrids
Fuel cells
Ionic liquids
Issue Date: 2016
Publisher: Wiley
Abstract: The protic ionic liquid (PIL) N-butylimidazolium trifluoromethanesulfonate ([BIm][TfO]) was obtained for the first time and incorporated into a sol–gel-derived di-ureasil matrix with a concentration of X=5, 10, and 30 %, where X is the ratio of the mass of PIL per mass of poly(oxyethylene). Four years after their synthesis, the resulting quasi-anhydrous electrolytes remained amorphous, homogeneous, flexible, and thermally stable below 200 °C. SEM/EDS data revealed the presence of the PIL at the surface of the xerogels with X>5 %, demonstrating that this type of morphological characterization is mandatory to avoid misleading ionic conductivity values. The highest ionic conductivity was produced in the washed sample with X=30 % (3.5×10−5 and 2.1×10−3 S cm−1 at 25 and 170 °C, respectively). The present family of electrolytes yielded higher conductivities than the N-ethylimidazolium trifluoromethanesulfonate-based analogues introduced earlier by our group and may thus be considered as promising candidates for applications in fuel cells.
Peer review: yes
DOI: 10.1002/celc.201500557
ISSN: 2196-0216
Appears in Collections:CICECO - Artigos

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