Electrochromic devices incorporating biohybrid electrolytes doped with a lithium salt, an ionic liquid or a mixture of both

M. Fernandes, R. Leones, A. M. S. Costa, M. M. Silva, S. Pereira, J. F. Mano, E. Fortunato, R. Rego, V. De Zea Bermudez

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The sol-gel method was employed in the synthesis of di-urethane cross-linked poly(∈-caprolactone) (PCL(530))/siloxane biohybrid ormolytes incorporating either a mixture of lithium triflate (LiCF3SO3) and the ionic liquid (IL) 1-ethyl-3-methyl imidazolium tetrafluoroborate ([Emim]BF4), or solely with [Emim]BF4 or LiCF3SO3. The ormolyte doped with [Emim]BF4 is thermally more stable and exhibits higher ionic conductivity (4 × 10-4 and 2 × 10-3 S cm-1 at 36 and 98 °C, respectively) than those containing the LiCF3SO3/[Emim]BF4 mixture or just LiCF3SO3. The three ormolytes were employed in the production of glass/ITO/ormolyte/WO3/ITO/glass electrochromic devices (ECDs) designated as ECD@Y with Y = Li-[Emim]BF4, [Emim]BF4 and Li. The three ECDs displayed fast switching speed (ca. 30 s). ECD@Li-[Emim]BF4 exhibited an electrochromic contrast of 18.4% and an optical density change of 0.11 in the visible region, the coloration efficiency attained at 555 nm was 152 and 80.2 cm2C-1 in the "on" and "off" states, respectively, and the open circuit memory was 48 hours. In the "on" state the CIE 1931 color space coordinates were x = 0.29 and y = 0.30, corresponding to blue color.

Original languageEnglish
Pages (from-to)226-235
Number of pages10
JournalElectrochimica Acta
Volume161
DOIs
Publication statusPublished - 10 Apr 2015

Fingerprint

Electrochromic devices
Ionic Liquids
Lithium
Ionic liquids
Electrolytes
Salts
ITO glass
Color
Density (optical)
Ionic conductivity
Sol-gel process
Siloxanes
Data storage equipment
Urethane
imidazolium tetrafluoroborate
Networks (circuits)

Keywords

  • 1-ethyl-3-methyl
  • electrochromic devices
  • imidazolium tetrafluoroborate
  • lithium triflate
  • organic-inorganic biohybrids
  • sol-gel process

Cite this

Fernandes, M., Leones, R., Costa, A. M. S., Silva, M. M., Pereira, S., Mano, J. F., ... De Zea Bermudez, V. (2015). Electrochromic devices incorporating biohybrid electrolytes doped with a lithium salt, an ionic liquid or a mixture of both. Electrochimica Acta, 161, 226-235. https://doi.org/10.1016/j.electacta.2015.02.036
Fernandes, M. ; Leones, R. ; Costa, A. M. S. ; Silva, M. M. ; Pereira, S. ; Mano, J. F. ; Fortunato, E. ; Rego, R. ; De Zea Bermudez, V. / Electrochromic devices incorporating biohybrid electrolytes doped with a lithium salt, an ionic liquid or a mixture of both. In: Electrochimica Acta. 2015 ; Vol. 161. pp. 226-235.
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Electrochromic devices incorporating biohybrid electrolytes doped with a lithium salt, an ionic liquid or a mixture of both. / Fernandes, M.; Leones, R.; Costa, A. M. S.; Silva, M. M.; Pereira, S.; Mano, J. F.; Fortunato, E.; Rego, R.; De Zea Bermudez, V.

In: Electrochimica Acta, Vol. 161, 10.04.2015, p. 226-235.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electrochromic devices incorporating biohybrid electrolytes doped with a lithium salt, an ionic liquid or a mixture of both

AU - Fernandes, M.

AU - Leones, R.

AU - Costa, A. M. S.

AU - Silva, M. M.

AU - Pereira, S.

AU - Mano, J. F.

AU - Fortunato, E.

AU - Rego, R.

AU - De Zea Bermudez, V.

PY - 2015/4/10

Y1 - 2015/4/10

N2 - The sol-gel method was employed in the synthesis of di-urethane cross-linked poly(∈-caprolactone) (PCL(530))/siloxane biohybrid ormolytes incorporating either a mixture of lithium triflate (LiCF3SO3) and the ionic liquid (IL) 1-ethyl-3-methyl imidazolium tetrafluoroborate ([Emim]BF4), or solely with [Emim]BF4 or LiCF3SO3. The ormolyte doped with [Emim]BF4 is thermally more stable and exhibits higher ionic conductivity (4 × 10-4 and 2 × 10-3 S cm-1 at 36 and 98 °C, respectively) than those containing the LiCF3SO3/[Emim]BF4 mixture or just LiCF3SO3. The three ormolytes were employed in the production of glass/ITO/ormolyte/WO3/ITO/glass electrochromic devices (ECDs) designated as ECD@Y with Y = Li-[Emim]BF4, [Emim]BF4 and Li. The three ECDs displayed fast switching speed (ca. 30 s). ECD@Li-[Emim]BF4 exhibited an electrochromic contrast of 18.4% and an optical density change of 0.11 in the visible region, the coloration efficiency attained at 555 nm was 152 and 80.2 cm2C-1 in the "on" and "off" states, respectively, and the open circuit memory was 48 hours. In the "on" state the CIE 1931 color space coordinates were x = 0.29 and y = 0.30, corresponding to blue color.

AB - The sol-gel method was employed in the synthesis of di-urethane cross-linked poly(∈-caprolactone) (PCL(530))/siloxane biohybrid ormolytes incorporating either a mixture of lithium triflate (LiCF3SO3) and the ionic liquid (IL) 1-ethyl-3-methyl imidazolium tetrafluoroborate ([Emim]BF4), or solely with [Emim]BF4 or LiCF3SO3. The ormolyte doped with [Emim]BF4 is thermally more stable and exhibits higher ionic conductivity (4 × 10-4 and 2 × 10-3 S cm-1 at 36 and 98 °C, respectively) than those containing the LiCF3SO3/[Emim]BF4 mixture or just LiCF3SO3. The three ormolytes were employed in the production of glass/ITO/ormolyte/WO3/ITO/glass electrochromic devices (ECDs) designated as ECD@Y with Y = Li-[Emim]BF4, [Emim]BF4 and Li. The three ECDs displayed fast switching speed (ca. 30 s). ECD@Li-[Emim]BF4 exhibited an electrochromic contrast of 18.4% and an optical density change of 0.11 in the visible region, the coloration efficiency attained at 555 nm was 152 and 80.2 cm2C-1 in the "on" and "off" states, respectively, and the open circuit memory was 48 hours. In the "on" state the CIE 1931 color space coordinates were x = 0.29 and y = 0.30, corresponding to blue color.

KW - 1-ethyl-3-methyl

KW - electrochromic devices

KW - imidazolium tetrafluoroborate

KW - lithium triflate

KW - organic-inorganic biohybrids

KW - sol-gel process

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EP - 235

JO - Electrochimica Acta

JF - Electrochimica Acta

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