Abstract This article describes the design of a silver electrodeposition-based electrochromic (EC) device with excellent image retention properties by using the counter electrode reaction of Prussian blue (PB). We demonstrated silver electrodeposition-based EC device enabled various optical states without dyes and pigments. These optical states were explained by localized surface plasmon resonance (LSPR) absorption of silver nanoparticles electrodeposited on an indium tin oxide (ITO) electrode. However, the color retention property of the device was inadequate because of the presence of Cu2+ ions, which function as redox reaction materials at the counter electrode. That is, Cu2+ in the electrolyte oxidizes the silver deposits on the electrode, resulting in a lack of image retention property. To improve both the redox reactivity of the counter electrode and color retention property, here we utilized PB as the counter electrode material. We discuss the device properties of the silver electrodeposition-based EC device with the PB counter electrode in terms of charge density or its ability to change color. The device achieved both longer retention time in the colored state and reversibility. It has an advantage of maintaining the coloring state without electric power for practical applications.

中文翻译：

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基于双稳态银电沉积的 EC 装置，带有普鲁士蓝反电极，无需电源即可保持镜面状态

摘要 本文介绍了利用普鲁士蓝 (PB) 的对电极反应设计具有优异图像保留性能的银电沉积电致变色 (EC) 器件。我们展示了基于银电沉积的 EC 设备，无需染料和颜料即可实现各种光学状态。这些光学状态可以通过电沉积在氧化铟锡 (ITO) 电极上的银纳米粒子的局域表面等离子体共振 (LSPR) 吸收来解释。然而，由于存在作为对电极氧化还原反应材料的 Cu2+ 离子，该器件的保色性不足。也就是说，电解液中的 Cu2+ 会氧化电极上的银沉积物，导致图像保留性能不足。为了提高对电极的氧化还原反应性和保色性，我们在这里使用 PB 作为对电极材料。我们讨论了基于银电沉积的 EC 器件与 PB 对电极在电荷密度或其变色能力方面的器件特性。该设备在有色状态下实现了更长的保留时间和可逆性。它具有在实际应用中无需电力即可保持着色状态的优点。