A robust double-network polymer evaporator for enhanced solar-driven water purification

sp²-Carbon-conjugated porous polymers (sp²C-CPPs) are promising photothermal materials but suffer from poor processability. We present a double-network cross-linked polymer foam (DN-CPF) that integrates sp²C-CPPs with flexible polymer chains, achieving 92.6% photothermal efficiency and a water evaporation rate of 1.53 kg m^-2 h^-1 under one sun, demonstrating excellent stability, salt resistance, and potential for efficient solar-driven desalination.