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Hydrovoltaic generator. (a) A biomimetic interfacial evaporation-driven hydrovoltaic generator. Reprinted with permission from [118]. (b) A novel, flexible dual-mode power generator. Reprinted with permission from [18]. (c) A straightforward and efficient ion-selective hydrogel film. Reprinted with permission from [119]. (d) A novel hydrovoltaic generator utilizing a Janus double-layer membrane with asymmetric wettability. Reprinted with permission from [120].
