Eco-friendly sol-gel derived sodium-based ormolytes for electrochromic devices
authors Fernandes, M; Leones, R; Pereira, S; Costa, AMS; Mano, JF; Silva, MM; Fortunato, E; Bermudez, VD; Rego, R
nationality International
journal ELECTROCHIMICA ACTA
author keywords organic/inorganic hybrid ormolytes; poly(epsilon-caprolactone)(530)/siloxane; poly(oxyethylene)/siloxane; sodium triflate; electrochromic devices
keywords POLY(EPSILON-CAPROLACTONE)/SILOXANE BIOHYBRID ELECTROLYTES; NA-ION BATTERIES; POLY(ETHYLENE OXIDE); POLYMER ELECTROLYTES; LITHIUM TRIFLATE; CONDUCTIVITY; COMPLEXES; SYSTEMS; MORPHOLOGY; WINDOWS
abstract The sol-gel method was employed in the preparation of organic/inorganic biohybrid ormolytes composed of a di-urethane cross-linked poly(epsilon-caprolactone) (PCL(530))/siloxane matrix doped for the first time with different amounts of sodium triflate (NaCF3SO3.xH(2)O). The samples are semi-crystalline and thermally stable up to ca. 250 degrees C. The maximum ionic conductivity (4.1 x 10(-7), 1.5 x 10(-4) and 8.8 x 10(-4) S cm(-1) at 30, 49 and 97 degrees C, respectively) was attained at n = 6, where n (composition) corresponds to the number of ester (C(double bond; length as m-dashO)(CH2)5O) repeat units of PCL(530) per sodium ion. Selected ormolytes were employed in the construction and characterization of prototype electrochromic devices (ECDs). Tests with ECDs incorporating poly(oxyethylene)/siloxane (U(600))(n)NaCF3SO3 (where n is the ratio of ether (OCH2CH2) repeat units per sodium ion) ormolytes already reported were also performed. The devices exhibited fast switching time of ca. 30 s. At 555 nm the ECD@U600(63)Na device exhibited the highest optical density value (Delta(OD) = 0.12) and coloration efficiency for bleaching (CE(ou)t 131 cm(2)C-1, 50th cycle) and good optical memory. The ECD@PCL58Na device exhibited a CE value for coloration (0.12 versus 0.061) similar to that of ECD@U600(63)Na (CEin -116 cm2C-1, 50th cycle) and a very good stability. However the Delta(OD) value for the latter device was much higher.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2017
volume 232
beginning page 484
ending page 494
digital object identifier (doi) 10.1016/j.electacta.2017.02.098
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000398327300056
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journal impact factor 5.116
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