The printed electronics technology can be used to efficiently construct smart devices and is dependent on functional inks containing well-dispersed active materials. Two-dimensional (2D) materials are promising functional ink candidates due to their superior properties. However, the majority 2D materials can disperse well only in organic solvents or in surfactant-assisted water solutions, which limits their applications. Herein, we report a lithium (Li)-ion exchange method to improve the dispersity of the NaWO nanosheets in pure water. The Li-ion-exchanged NaWO (LiNaWO) nanosheets show highly stable dispersity in water with a zeta potential of -55 mV. Moreover, this aqueous ink can be sprayed on various substrates to obtain a uniform LiNaWO nanosheet film, exhibiting an excellent electrochromic performance. A complementary electrochromic device containing a LiNaWO nanosheet film as an electrochromic layer and Prussian white (PW) as an ion storage layer exhibits a large optical modulation of 75% at 700 nm, a fast switching response of less than 2 s, and outstanding cyclic stability. This NaWO-based aqueous ink exhibits considerable potential for fabricating large-scale and flexible electrochromic devices, which would meet the practical application requirements.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9743895 | PMC |
| http://dx.doi.org/10.1007/s12200-020-1033-z | DOI Listing |
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