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Thermo- and electrochromic smart window derived from a viologen-tethered triazolum based poly(NIPAm n -TEG-BPV) electrolyte to enhance building energy efficiency and visual comfort

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 455, Page: 140874
2023
  • 9
    Citations
  • 0
    Usage
  • 23
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    9
    • Citation Indexes
      9
  • Captures
    23

Article Description

In this work, we synthesized by facilely incorporating a modified asymmetric viologen onto the triazole moiety of a phase-changing monomer [poly(NIPAm n -TEG)] via quaternization to produce dual-responsive material [poly(NIPAm n -TEG-BPV)]. However, most chromic material-based smart windows have responded to only one stimulus, but studies on dual-responsive windows are to be given more attention due to the many opportunities in terms of utility and activity that they offer. Whereas here in our work apart from being electrochromic, the material is thermochromic as well, switching from clean to opaque at when heated from 25 to 32 °C as a result of phase transformation, attaining >84.7 % optical contrast (ΔT) in the visible range (650 nm). Similar results were obtained while switching from a clear state to a purple state at an applied potential of ∼ 2.5 V which gave an optical contrast of (ΔT) >89.6 % (550 nm). A coloration speed of 8.1 s and bleaching speed of 26.1 s were attained by the poly(NIPAm n -TEG-BPV) with a coloration efficiency of 346 cm 2 C −1 and cyclic stability of >500 cycles. The synergistic effect of its thermochromic and electrochromic response when stimulated simultaneously, showed a transparent state to a cloudy blue state and gave high (ΔT) >91.05 % with full absorption of the entire visible solar spectrum resulting to a truly blue opaque state that is ideal for building façade requiring absolute privacy.

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