헥사사이아노철(Ⅱ,Ⅲ)산 전이금속(Fe(Ⅲ)

Abstract

Electrochromic (EC) devices have drawn great attention for high potential to solar control applications such as smart windows. Prussian blue(PB, iron(III) hexacyanoferrate(II)) is a well-known electrochromic material and its analogues(M-PBA) whose Fe(III) ions are replaced by various combinations of transition metals(Co2+, Cu2+, Ni2+) show also electrochromic properties. Objectives of this study are development of wet-coating method for mass production of plastic PB and M-PBA electrodes and their application to EC devices. The main results included in the thesis are as follows:

1. The synthetic condition of insoluble and soluble PB and M-PBA nano particles were de-veloped for application to the wet-coating method 2. PB and M-PBA/silica films on PET/ITO or PEN/ITO substrate were prepared by using silica-sol with nanocrystalline PB and PBA particles. The prepared PB and M-PBA/silica films were much more stable and electrochromically effective than those prepared the conventional electrochemical deposition method. 3. Modified PB(PB + M-PBA)/silica electrodes for enhance the stability and color tuning were prepared by simple mixing PB and M-PBA, which are more stable than pure PB and M-PBA electrodes. The UV-Vis absorption spectrum of (PB + M-PBA)/silica elec-trodes and pure PB/silica electrode were very similar to each other. Therefore, color tun-ing by simple mixing PB and M-PBA was not as effective as hoped. 4. The flexible electrochromic devices are assembled by the combination of the prepared PB, PB+M-PBA and M-PBA/silica electrodes with a polymer gel electrolyte. The per-formance of EC devices was affected by substrate resistance, electrolyte type, and dis-tance of two electrodes and applied potential. The plastic (PB+Co-PBA)/Co-PBA silica EC devices has been tested by cycling them between the colored and bleached states at potential of -1.5 and +0.3V (30 s), respectively, up to 100,000 cycles. It exhibited excel-lent color and bleach reversibility more than 100,000 cycles.