Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/90917
Title: Highly Conducting Bombyx mori Silk Fibroin-Based Electrolytes Incorporating Glycerol, Dimethyl Sulfoxide and [Bmim]PF6
Authors: Fernandes, Tânia C. D.
Rodrigues, Helena M. R.
Paz, Filipe A. A.
Sousa, Joana F. M.
Valente, Artur J. M. 
Silva, Maria M. 
Bermudez, Verónica de Zea
Pereira, Rui F. P.
Issue Date: 2020
Publisher: The Electrochemical Society by IOP Publishing Limited
Project: UID/QUI/00686/2018 
UID/QUI/00686/2019 
UID/QUI/50006/2019 
UID/QUI/00313/2020 
PEst-OE/QUI/UI0616/2014 
POCI-01-0145-FEDER-016884 
PTDC/CTM-NAN/0956/2014 
POCI-01-0145-FEDER-016422 
SAICTPAC/0032/2015 
POCI-01-0145-FEDER-029785 
PTDC/CTM-REF/29785/2017 
NORTE-01-0145-FEDER-030858 
PTDC/BTM-MAT/30858/2017 
Serial title, monograph or event: Journal of The Electrochemical Society
Volume: 167
Issue: 7
Abstract: Green, transparent and flexible electrolyte films composed of a Bombyx mori silk fibroin (SF) host biopolymer doped with glycerol (G), dimethyl sulfoxide (DMSO, D) and 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid (IL), were synthesized. The materials were represented by the notation SF@GD@ILx (x = 15, 20 and 30 is the mass ratio of SF/[Bmim]PF6 in %). SF@, SF@G, SF@D and SF@GD samples were also prepared. DMSO was found to play a dual-role, acting as solvent of [Bmim]PF6, and enhancing ionic conductivity. DMSO, alone or combined with [Bmim]PF6, led to the increase of the mean roughness and induced the formation of more ordered Silk II conformations (β-sheets). No structural modifications were detected in the SF@GD@ILx samples upon increasing the temperature up to 100 °C. The highest ionic conductivity was exhibited by the IL-rich sample SF@GD@IL30 (1.07 and 4.61 mS cm−1, at 22 and 100 °C, respectively). In the [Bmim]PF6-doped electrolytes "free" and coordinated PF6 − ions coexist. The weight losses occurring below 200 °C involved essentially the release of adsorbed water and DMSO. The suitable mechanical properties, high ionic conductivity and good electrochemical stability suggest that these electrolytes are attractive candidates for application in electrochemical devices.
URI: http://hdl.handle.net/10316/90917
ISSN: 1945-7111
DOI: 10.1149/1945-7111/ab8313
Rights: openAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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