An electrochromic device based on Prussian blue, self-immobilized vinyl benzyl viologen, and ferrocene

Hsin Che Lu, Sheng Yuan Kao, Ting Hsiang Chang, Chung Wei Kung, Kuo Chuan Ho

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


In this study, the electrochromic property of vinyl benzyl viologen (VBV) was first investigated and incorporated in an electrochromic device (ECD). The polymerizable vinyl moiety of VBV enables a self-immobilization through UV-curing under potential bias. Immobilized VBV (I-VBV) was obtained on the electrode and grafted with polymer electrolyte. An ECD consisted of Prussian blue (PB), I-VBV, and ferrocene (Fc) was fabricated (PB/Fc/I-VBV ECD) in which Fc acted as a redox mediator. With the utilization of polymer electrolyte, Fc, and immobilization of VBV, the proposed PB/Fc/I-VBV ECD with a UV-curing time of 40 s (PB/Fc/I-VBV-40) exhibited the best cell performance among all conditions in terms of long-term stability. It gives 60.6% transmittance change (δT) at 615 nm initially when switched between 1.2 V and -0.8 V. Short bleaching and coloring times of 1.32 s and 2.13 s were achieved respectively. Moreover, good long-term stability was obtained, maintaining 86.5% of its original δT after 10,000 cycles. The PB/Fc/I-VBV ECD also exhibited a unique memory characteristic among all viologens-based ECDs reported in literatures and allowed the possibility for tuneable multi-electrochromism.

Original languageEnglish
Pages (from-to)75-84
Number of pages10
JournalSolar Energy Materials and Solar Cells
Publication statusPublished - 2016 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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