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Di‐ureasil Hybrid Electrolytes Incorporating a New Proton Ionic Liquid
Author(s) -
Cardoso Marita A.,
Leones Rita,
Rodrigues Luísa C.,
Fernandes Mariana,
Figueiredo Filipe L.,
Nunes Sílvia C.,
Silva M. Manuela,
de Zea Bermudez Verónica
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500557
Subject(s) - trifluoromethanesulfonate , ionic liquid , anhydrous , ionic conductivity , electrolyte , conductivity , ionic bonding , homogeneous , chemistry , amorphous solid , inorganic chemistry , materials science , ion , crystallography , organic chemistry , catalysis , physics , electrode , thermodynamics
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.