Super-High Stable Dual Polymer Electrochromic Device Over 35 000 Cycles with Red-to-Green Switching for Realistic Adaptive Camouflage.

Achieving high-realistic electrochromic adaptive camouflage remains a significant technological challenge. In this work, reddish/brown and green camouflage polymers (TTP, TEP, TPP and PBP3P) with excellent electrochromic properties are obtained through terpolymerization. Leveraging the color complementary concept, three dual polymer electrochromic camouflage devices with red-to-green hues are constructed, utilizing TTP/TEP/TPP as the electrochromic (EC) layer, and PBP3P as the ion storage (IS) layer. Notably, the TTP-PBP3P device demonstrated a remarkable 99.94% retention of its initial contrast after 35 000 cycles due to its charge-matching characteristics (the ratio of injected and ejected charges, QOx/QRed ≈ 1), representing the highest stability in current electrochromic camouflage research. By incorporating nylon filter membranes featuring adjustable aperture sizes as transmittance-tunable (TT) layers, the camouflage performance is significantly enhanced. This strategy introduces a novel and robust methodology for achieving ultra-high stability and realistic adaptive camouflage.