High-Fidelity, High-Conductivity and Multifunctional PEDOT:PSS Hydrogel for Efficient Electromagnetic Interference Shielding and Ultrafast Response Electrochromic Applications.

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hydrogel are promising for applications in electromagnetic interference (EMI) shielding, energy storage, and electrochromic (EC) devices. However, challenges such as low conductivity at reduced solid content, limited charge storage, poor mechanical properties, and structural distortion during solvent treatment limit their high-performance applications. To address these issues, a high-fidelity, high-conductivity and multifunctional PEDOT:PSS hydrogel is developed by an ice crystal-assisted skeleton stacking and stepwise treatment strategy, achieving ultrahigh conductivity of 87,249 S m at 5.