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Gellan‐Gum and LiTFSI‐Based Solid Polymer Electrolytes for Electrochromic Devices
Author(s) -
Isfahani Vahideh Bayzi,
Pereira Rui F. P.,
Fernandes Mariana,
Sabadini Rodrigo C.,
Pereira Sónia,
Dizaji Hamid Rezagholipour,
Arab Ali,
Fortunato Elvira,
Pawlicka Agnieszka,
Rego Rosa,
Zea Bermudez Verónica,
Silva Maria M.
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004614
Subject(s) - electrochromism , electrochromic devices , materials science , electrolyte , prussian blue , cyclic voltammetry , gellan gum , lithium (medication) , polymer , chemical engineering , dielectric spectroscopy , thermal stability , electrochemistry , analytical chemistry (journal) , electrode , chemistry , composite material , organic chemistry , food science , engineering , endocrinology , medicine
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/CeO 2 ‐TiO 2 /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 GeGly 1 Li 2.4 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 CE in and CE out values of −4925 cm 2 C −1 for bleaching (Q in =−272.1 μC cm −2 ), and 2062 cm 2 C −1 for coloring (Q out =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.