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Researchers at Harbin Institute of Technology (Shenzhen) embedded sorghum straw biochar into a polyzwitterionic hydrogel and achieved a solar evaporation rate of 3.57 kg m⁻² h⁻¹ under one-sun irradiation, roughly 1.87 times higher than the biochar-free hydrogel. The study demonstrates that low-cost biomass-derived biochar can simultaneously enhance photothermal conversion, heat localization, and water molecule activation in hydrogel evaporators, offering a viable pathway for biochar use in solar-driven desalination materials.