Figure 2
From: Hydropower generation by transpiration from microporous alumina
(a) Voltage generated by alumina with respect to time when the alumina block was immersed 1.5 cm in water. (b) Voltage generated by alumina continuously for 7 days, in which each cycle represents 10 h of measurements per day. (c) An I-V curve with the dry sample without water and wet sample half-immersed in water. (d) Magnified I-V curve near the origin shown in (c).
