New effective process to fabricate fast switching and high contrast electrochromic device based on viologen and Prussian blue/antimony tin oxide nano-composites with dark colored state

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• 作者：Yu Rong^a ; Sooyeun Kim^a ; Fengyu Su^a ; Daniel Myers^a ; Minoru Taya ; ^a ; ^{tayam@u.washington.edu"" rel=""nofollow}
• 关键词：Electrochromic display ; Viologen ; Prussian blue ; Antimony tin oxide ; Nano-composites
• 刊名：Electrochimica Acta
• 出版年：2011
• 出版时间：1 July 2011
• 年：2011
• 卷：56
• 期：17
• 页码：6230-6236
• 全文大小：1153 K

文摘

We developed a new electrochromic device by using compact Prussian blue (PB)/antimony tin oxide (ATO) nano-composites as anodic electrode and viologen anchoring on titanium dioxide (TiO₂) nano-particles as cathodic electrode. The anodic electrode was based on a transparent nanostructured ATO nano-particle film and was electro-deposited by Prussian blue to form compact Prussian blue/ATO nano-composites by means of galvanostatic electrodeposition process. Nanocrystalline TiO₂ thin films on conducting glass were modified with a mono-layer of viologen with two anchoring groups, which were much strongly adsorbed onto the surface of TiO₂ nano-particles. A polymer gel electrolyte sandwiched between the anodic and cathodic layers is used as the ionic transport layer. The 2.5 cm × 2.5 cm electrochromic device shows high contrast (64.8 % , at 600 nm) very low transmittance at colored stage (0.1 % , at 600 nm), fast switching time (600 and 720 ms for coloration and bleaching, respectively), high coloration efficiency of 912 cm² C⁻¹ at 600 nm and good stability. The enhanced performance of the electrochromic device can be attributed to the ATO nano-particles as inter-conductive materials.