Tailorable Dual-Redox Polymer with Molecular Flexibility for Enhanced Electrochemical Desalination and Water Purification

. Impressively, the CDI device exhibits excellent electrochemical regeneration stability, retaining 92.0% efficiency over 200 cycles, placing it among the state-of-the-art CDI devices reported. Beyond desalination, the PNDBI-based CDI device showcases significant multifunctionality, enabling efficient water purification through the removal of hard water ions and cationic dyes, thereby offering a versatile and sustainable solution for environmental remediation.