Abstract
In this study, we examined the cyclic stability of Prussian blue (PB) films in electrolytes with acid. The cyclic stabilities of the PB films were investigated in K+ based electrolytes with different values of solution pH. The acidified KCl solution can significantly improve the durability of the film. Among the three pH values tested, the KCl solutions (pH = 2.15 and pH = 3.03) showed better performance. Furthermore, we investigated the cyclic stabilities of the PB films in LiClO4/PC electrolyte containing different acids. We found that the cyclic stability of PB film was significantly improved when a small amount of acetic acid was dissolved in LiClO4/PC electrolyte. The PB film exhibited stable optical modulation after up to 20,000 cycles in LiClO4/PC electrolyte containing acetic acid—a much higher result than those of some literatures. This suggests that the addition of acetic acid to LiClO4/PC electrolyte can promote the development of PB-based devices with improved stability.
Highlights
Electrochromism refers to the phenomenon that materials can switch their optical properties reversibly by applying an external potential or current [1]
Acidified KCl solutions can significantly improve the durability of the Prussian blue (PB) film, and the KCl solutions showed better performance
We investigated the cycle stabilities of PB films in LiClO4 /PC electrolyte containing different acids
Summary
Electrochromism refers to the phenomenon that materials can switch their optical properties reversibly by applying an external potential or current [1]. Numerous electrochromic materials have been investigated for their high optical modulation, great stability, and simple preparation, such as WO3 , NiO, and polyaniline [2,3,4,5,6,7]. These materials have been widely applied for various applications such as switchable windows [8], electrochromic displays [9], rechargeable batteries [10], and optical attenuators [11]. The methods mentioned above do not significantly improve the cycle life of the PB film, and the film generally exhibits obvious optical modulation decay after 2500 cycles. The cyclic stability of the PB films exhibited significant improvement when acetic acid was dissolved in LiClO4 /PC electrolyte
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