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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

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High-Performance Sustainable Electrochromic Devices Based on Carrageenan Solid Polymer Electrolytes with Ionic

João P Serra1,2, Manuel Salado3, Daniela M Correia4

  • 1Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho 4710-057 Braga, Portugal.

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|May 31, 2023
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Summary

Sustainable electrochromic devices were developed using carrageenan, a natural polymer, blended with ionic liquids. These materials show high efficiency and optical switching, offering eco-friendly alternatives for various applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Chemistry

Background:

  • Growing interest in sustainable functional materials to mitigate environmental impact.
  • Electrochromic materials are crucial for applications in sensing and smart devices.
  • Natural polymers offer a sustainable alternative to conventional synthetic materials.

Purpose of the Study:

  • To develop sustainable electrochromic materials based on carrageenan and ionic liquids.
  • To investigate the effect of ionic liquid content on material properties and device performance.
  • To demonstrate the feasibility of creating efficient and eco-friendly electrochromic devices.

Main Methods:

  • Blending natural carrageenan with varying amounts of 1-ethyl-3-methylimidazolium thiocyanate ([EMIM][SCN]) ionic liquid.
  • Characterization of material morphology, physicochemical, thermal properties, and ionic conductivity.
  • Fabrication and testing of electrochromic devices using carrageenan/ionic liquid electrolytes and PEDOT:PSS electrodes.

Main Results:

  • Ionic conductivity increased significantly with ionic liquid content, reaching 4.6 × 10⁻⁴ S·cm⁻¹.
  • Electrochromic devices operated effectively at low voltages (0.3 to -0.9 V).
  • The optimal material (15 wt% IL) exhibited fast switching times (6s oxidation, 8s reduction) and 99% optical switching (Δ%Tx).

Conclusions:

  • Sustainable electrochromic devices can be successfully developed using carrageenan and ionic liquids.
  • The ionic liquid content is critical for enhancing ionic conductivity and device performance.
  • These materials present a promising, eco-friendly alternative for advanced electrochromic applications.