Ultra-Low Power Electrochromic Heat Shutters through Tailoring Diffusion-Controlled Behaviors

Ye Ryeong In, Yong Min Kim, Yujeong Lee, Won Young Choi, Se Hyun Kim, Seung Woo Lee, Hong Chul Moon

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


In this study, we propose low power consumption, all-in-one type electrochromic devices (ECDs) for effective heat shutters. Considering diffusion-controlled device operation, polymeric viologens (poly-viologens) are synthesized to lower the diffusivity of EC chromophores and to minimize self-bleaching. In comparison with devices based on mono-viologens corresponding to the monomer of poly-viologens, poly-viologen-containing ECDs exhibit advantages of lower coloration voltage (ca,-0.55 V) and higher coloration/bleaching cyclic stability (>1500 cycles). In particular, poly-viologen ECDs show remarkably reduced self-bleaching as designed, resulting in extremely low power consumption (â8.3 μW/cm2) to maintain the colored state. Moreover, we successfully demonstrate solar heat shutters that suppress the increment of indoor temperature by taking the advantage of low-power operation and near-IR absorption of the colored poly-viologen-based ECDs. Overall, these results imply that the control of the diffusivity of EC chromophores is an effective methodology for achieving single-layered, low-power electrochemical heat shutters that can save indoor cooling energy when applied as smart windows for buildings or vehicles.

Original languageEnglish
Pages (from-to)30635-30642
Number of pages8
JournalACS applied materials & interfaces
Issue number27
StatePublished - 8 Jul 2020


  • diffusion-controlled electrochemical devices
  • electrochromism
  • heat shutters
  • ion gels
  • polymer viologens


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