TY - JOUR
T1 - Gellan-Gum and LiTFSI-Based Solid Polymer Electrolytes for Electrochromic Devices
AU - Isfahani, Vahideh Bayzi
AU - Pereira, Rui F. P.
AU - Fernandes, Mariana
AU - Sabadini, Rodrigo C.
AU - Pereira, Sónia
AU - Dizaji, Hamid Rezagholipour
AU - Arab, Ali
AU - Fortunato, Elvira
AU - Pawlicka, Agnieszka
AU - Rego, Rosa
AU - de Zea Bermudez, Verónica
AU - Silva, Maria M.
N1 - info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00616%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00616%2F2020/PT#
Funding Information:
The authors are grateful to Funda??o para a Ci?ncia e a Tecnologia (FCT) under contracts, UID/QUI/00686/2020.V. B. Isfahani acknowledges a Post-Doc grant from the project NORTE-01-0145-FEDER-028538. R.F.P. Pereira thanks FCT-UM for the contracts in the scope of Decreto-Lei 57/2016 and 57/2017. M. Fernandes acknowledges FCT-UTAD for the contract in the scope of Decreto-Lei 57/2016 and Lei 57/2017. A. Pawlicka acknowledges The Brazilian National Council for Scientific and Technological Development (CNPq) for grant 307429/2017-2 and R. C. Sabadini acknowledges ?Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior? (CAPES) for grant 88881.172281/2018-01.
PY - 2021/5/27
Y1 - 2021/5/27
N2 - It has been long recognized that solid polymer electrolytes (SPEs) are potentially interesting for solid-state electrochemical devices. Gellan gum (Ge)-based SPEs, plasticized with glycerol (Gly) and doped with lithium bis(trifluoromethanesulfone)imide (LiTFSI) were prepared by the solvent casting technique, and their properties were evaluated. LiTFSI-based SPE systems exhibit, on the average, higher conductivities than similar systems with other lithium salts. The structure, morphology, complex impedance spectroscopy, cyclic voltammetry and thermal stability of the new electrolyte system were characterized. Electrochromic devices (ECDs) were built with optimized electrolyte samples and their performance was analyzed. The samples were applied in small ECDs with glass/ITO/CeO2-TiO2/SPE/Prussian blue/ITO/glass configuration. The devices presented a two-modulation operation: a semi-bright mode (−2.5 V) and a dark mode (+0.5 V). The best results were obtained with the ECD containing the GeGly1Li2.4 electrolyte, for which the transmittance (T) values in the bleached and colored states were ca. 33.4/43.0 % and 5.4/8.8 % at 555/1000 nm, respectively. These results correspond to ΔT and ΔOD values of 28.0/34.2 % and 0.79/0.69, respectively, which give quite high CEin and CEout values of −4925 cm2 C−1 for bleaching (Qin=−272.1 μC cm−2), and 2062 cm2 C−1 for coloring (Qout=650.0 μC cm−2), at 630 nm. This electro-optical performance suggests that the proposed SPE systems are promising materials to be further investigated and applied in ECDs.
AB - It has been long recognized that solid polymer electrolytes (SPEs) are potentially interesting for solid-state electrochemical devices. Gellan gum (Ge)-based SPEs, plasticized with glycerol (Gly) and doped with lithium bis(trifluoromethanesulfone)imide (LiTFSI) were prepared by the solvent casting technique, and their properties were evaluated. LiTFSI-based SPE systems exhibit, on the average, higher conductivities than similar systems with other lithium salts. The structure, morphology, complex impedance spectroscopy, cyclic voltammetry and thermal stability of the new electrolyte system were characterized. Electrochromic devices (ECDs) were built with optimized electrolyte samples and their performance was analyzed. The samples were applied in small ECDs with glass/ITO/CeO2-TiO2/SPE/Prussian blue/ITO/glass configuration. The devices presented a two-modulation operation: a semi-bright mode (−2.5 V) and a dark mode (+0.5 V). The best results were obtained with the ECD containing the GeGly1Li2.4 electrolyte, for which the transmittance (T) values in the bleached and colored states were ca. 33.4/43.0 % and 5.4/8.8 % at 555/1000 nm, respectively. These results correspond to ΔT and ΔOD values of 28.0/34.2 % and 0.79/0.69, respectively, which give quite high CEin and CEout values of −4925 cm2 C−1 for bleaching (Qin=−272.1 μC cm−2), and 2062 cm2 C−1 for coloring (Qout=650.0 μC cm−2), at 630 nm. This electro-optical performance suggests that the proposed SPE systems are promising materials to be further investigated and applied in ECDs.
KW - Electrochromic devices
KW - Gellan gum
KW - LiTFSI-based SPE
KW - Prussian blue
UR - http://www.scopus.com/inward/record.url?scp=85108151952&partnerID=8YFLogxK
U2 - 10.1002/slct.202004614
DO - 10.1002/slct.202004614
M3 - Article
AN - SCOPUS:85108151952
SN - 2365-6549
VL - 6
SP - 5110
EP - 5119
JO - ChemistrySelect
JF - ChemistrySelect
IS - 20
ER -