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Induced electricity originating from natural water evaporation. a) V oc generated by the device before (test I) and after (test II) the device was turned upside down. b) Test III: V oc of the device completely submerged by water. Test IV: V oc between two wires with the other ends immersed in water. c) V oc of the device when the sink was periodically sealed and unsealed. d) V oc of the device when the ambient air flow of 0.1 m s–1 was periodically turned on and off.
