A complementary electrochromic device composed of nanoparticulated ruthenium purple and Fe(II)-based metallo-supramolecular polymer

摘要

In this study, a nanoparticulated synthesis based surface modification was applied to a Prussian blue analogue (PBA), ruthenium purple (Fe-4[Ru(CN)(6)](3), RP). The RP nanoparticles (nRP) with significantly enhanced electrical and ionic conductivities were compared to their micro-scale counterpart (mRP). By reducing the kinetic barriers during electrochemical cycling, nRP showed pronounced enhancement in the optical properties including higher transmittance change (Delta T), shorter response time, faster redox kinetics, and better cycling stability. A novel complementary electrochromic device (ECD) was proposed to utilize nRP as the anodically coloring material and Fe(II)-based metallo-supramolecular polymer (Fe(II)-MEPE) as the cathodically coloring material. Both anodically and cathodically coloring materials exhibited maximum optical modulation around 550 nm, which is the most sensitive light spectrum to human eyes in the visible region. Upon applying potential biases between 0.3 and 1.3 V to the Fe(II)-MEPE/nRP ECD, a large transmittance change of 50.7% at 580 nm, fast response times of 0.4 s both in coloring/bleaching, and a high coloration efficiency of 512.5 cm(2)/C at 580 nm were observed. At the same operation condition, the proposed ECD retained 96.4% of its initial AT after 10,000 cycles of continuous switching.