• • Simple integration of resin with electrosorption achieves desalination efficiency exceeding 92.3%, demonstrating commercial viability for brackish water treatment.
• • Resin-coated composite electrodes eliminate co-ion effect, boosting total salt adsorption capacity by 42%, critical for energy-efficient desalination.
• • Resin-derived porous carbon electrodes exhibit adsorption capacities 3–5 times that of commercial activated carbon, offering superior material performance.
• • Resin-filling strategy enhances convection and electrophoretic convection, achieving a high desalination rate of (670 ± 20) mg/(L·h), enabling faster throughput in industrial applications.