Single tungsten atoms modified porous V2O5 nanoflowers with enhanced electrochromic performance

Transition metal oxides (TMOs) are promising inorganic electrochromic materials (ECMs) that can be widely used in smart windows, adaptive camouflage, electronic displays, energy storage, etc. However, there are still huge challenges for TMOs to simultaneously achieve high performance of electrochromism and cyclic stability. Herein, we successfully synthesize single tungsten (W) atom-modified hydrangea-like porous vanadium pentoxide nanoflowers (HLP-W/V2O5) with high loading content of W atoms (13.7%). The HLP-W/V2O5-based ECMs exhibit enhanced EC performance with three reversible color transformations (yellow, blue, and brown) at a voltage lower than 1.2 V and outstanding cyclic stability (10,000 cycles without significant attenuation). This work provides a feasible strategy for the efficient preparation of high-performance and durable TMO-based ECMs.