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.
keywords
POLY(EPSILON-CAPROLACTONE)/SILOXANE BIOHYBRID ELECTROLYTES; NA-ION BATTERIES; POLY(ETHYLENE OXIDE); POLYMER ELECTROLYTES; LITHIUM TRIFLATE; CONDUCTIVITY; COMPLEXES; SYSTEMS; MORPHOLOGY; WINDOWS
subject category
Electrochemistry
authors
Fernandes, M; Leones, R; Pereira, S; Costa, AMS; Mano, JF; Silva, MM; Fortunato, E; Bermudez, VD; Rego, R
our authors
Ana Margarida Silva Costa
PhD Student
João Mano
Vice DirectorGroups
G4 - Renewable Materials and Circular Economy
G5 - Biomimetic, Biological and Living Materials
Projects
Luminescent electrochromic devices incorporating organic/inorganic (bio)hybrid electrolytes (LUMECD)
acknowledgements
This work was supported by Fundacao para a Ciencia e a Tecnologia (FCT) (PTDC/CTM-NAN/0956/2014 and POCI-01-0145FEDER-016884, Pest-C/CTM/LA0025/2014, UID/QUI/00616/2013 and PEst-C/QUI/U10686/2013) and UniRCell (SAICTPAC/0032/2015 and POCI-01-0145-FEDER-01642). M. Fernandes, R. Leones and A.M.S. Costa acknowledge FCT for grants (SFRH/BPD/78919/2011, SFRH/BD/90366/2012 and SFRH/BD/101748/2014, respectively).