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An underlying intercalation ion for fast-switching and stable electrochromism

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Abstract

Electrochromic devices have many important commercial applications ranging from electronic paper like displays, antiglare rear-view mirrors in cars, to energy-saving smart windows in buildings. Monovalent ions such as H+, Li+, and Na+ are widely used as insertion ions in electrochromic devices, but they have limitations such as instability, high cost, and hard handling. The utilization of multivalent ions as insertion ions has been overlooked probably because of the strong electrostatic interactions between ions and intercalation framework as well as the resulted difficulties of intercalation.The bivalent cation, Mg2+, has been proved to be efficient electrochromic insertion ions for the electrochromic processes of the nonstoichiometric W18O49 nanowires. Using Mg2+ based aqueous electrolyte, the electrochromic W18O49 nanowires shows a short coloration/bleaching time of 2.7/3.6 s, and a high tinting productiveness of 116 cm2/c, together with excellent cyclic constancy. The utilization of bivalent Mg2+ as insertion ions will benefit electrochromic devices with low cost, high stability and simple operation.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (61663019), the Scientifical and Technological Project of Gansu Province (1610RJZA056).

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Correspondence to Jinxiong Zhao.

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Zhao, J., Wang, G., Zhang, Q. et al. An underlying intercalation ion for fast-switching and stable electrochromism. J Mater Sci: Mater Electron 30, 12753–12756 (2019). https://doi.org/10.1007/s10854-019-01640-2

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  • DOI: https://doi.org/10.1007/s10854-019-01640-2

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