In this work, we proposed an effective route of introducing poly(ionic liquid) (PIL) gel as electrolyte to suppress dimer formation of viologen radical cation during switching in electrochromic devices (ECDs). The ECDs were fabricated based on ion gels consisting of various viologens, PIL and ferrocene (Fc). We found that incorporation of PIL contributed to the suppression of dimer production. The suppression of dimer formation can provide ECDs with improved colouration efficiencies, faster switching times, longer cycle lives, and potentially reduced costs. The results showed that an excellent cyclic stability over 96% of initial transmittance change after 4000 cycles of switching.

在这项工作中，我们提出了一种引入聚离子液体（PIL）凝胶作为电解质的有效途径，以抑制电致变色器件（ECD）切换过程中紫精自由基阳离子的二聚体形成。ECD是基于由各种紫精，PIL和二茂铁（Fc）组成的离子凝胶制成的。我们发现掺入PIL有助于抑制二聚体产生。抑制二聚体的形成可以为ECD提供更高的着色效率，更快的切换时间，更长的循环寿命以及潜在地降低成本。结果表明，经过4000个循环的切换，其初始透射率的96％都具有出色的循环稳定性。