A light-weight, thin-thickness, flexible multifunctional electrochromic device integrated with variable optical, thermal management and energy storage

• Coral-like PANI nanowire was prepared by a two-step electrodeposition method. • PANI nanowire-based electrochromic device integrates with multiple functions. • The electrochromic device with optical, thermal management and energy storage. • The electrochromic device was light-weight, thin-thickness and flexible. • The electrochromic device can be fabricated in a multipixel and large area. Multifunctional electrochromic devices with diversified functions are highly desirable for intelligent electronic systems compared to conventional electrochromic devices with sole applicability. Herein, a multifunctional electrochromic device integrated with variable optical, thermal management and energy storage is realized by preparing nanowire‐structured coral-like PANI films on a flexible gold-plated membrane through the combination of galvanostatic and cyclic voltammetric electrodeposition techniques. The multifunctional electrochromic devices achieve reversible color changes between brownish-yellow, green and dark-green. The maximum emissivity changes of the multifunctional electrochromic device in the ranges of 3-5 μm, 8-14 μm and 2.5-15 μm are 0.42, 0.49 and 0.47 respectively. Moreover, a specific capacitance of 355 F g −1 is obtained for the multifunctional electrochromic devices at a current density of 1 A g −1 . The multifunctional electrochromic devices also have such advantages as light-weight, thin-thickness, flexible and can be fabricated in a multipixel and large area. With versatility characteristics, the multifunctional electrochromic devices are highly promising for intelligent electronic systems in electronic clothing, military camouflage and thermal control system of spacesuits.