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Water‐evaporation‐driven electricity generation with porous Al2O3 sheet. a) Experimental set‐up for measuring evaporation‐driven electricity. b) Schematic of the water‐flow‐induced streaming current in a single nanochannel of the sheet. c) Schematic of the LS‐TENG fabrication process and photograph of the LS‐TENG. d) SEM image of the Al2O3 sheet. e) Static contact angle of the LS‐TENG surface.
