A Facile Strategy To Construct Au@VxO2x+1 Nanoflowers as a Multicolor Electrochromic Material for Adaptive Camouflage

Transition metal oxides (TMOs) are promisinginorganic electrochromic materials (ECMs) that can be widelyused in electronic displays and adaptive camouflage. However,there are still huge challenges for TMOs to simultaneously achievemulticolor transformation capability and good cycling stability.Herein, we assemble Au-modified (0.01 wt %) VxO2x+1(x>2)nanoflowers (Au@VxO2x+1NFs) composed of two-dimensionalporous nanosheets containing two valences states of vanadium(V4+and V5+). The Au@VxO2x+1NFs exhibits outstandingelectrochromic performance withfive reversible color trans-formations (orange, yellow, green, gray, and blue) at a voltage less than 1.5 V and excellent cycling stability (2000 cycleswithout significant decay). To the best of our knowledge, this is thefirst time that a single vanadium oxide ECM, rather than adevice, realizesfive color changes. This work provides a feasible way for the efficient preparation of multicolor electrochromicTMOs. The newly developed Au@VxO2x+1NFs demonstrate the potential application in adaptive camouflage

Automated summary

Transition metal oxides (TMOs) are promising inorganic electrochromic materials (ECMs) that can be widely used in electronic displays and adaptive camouflage. However, achieving simultaneous multicolor transformation capability and good cycling stability in TMOs is still a challenge. In this study, Au-modified VxO2x+1 nanoflowers were successfully assembled, demonstrating five reversible color transformations and excellent cycling stability.