Fig. 4
From: Achieving ultrahigh triboelectric charge density for efficient energy harvesting
Application of the TENG to drive electronics devices. a Circuit diagram of the self-powered system consisting of the TENG and a supercapacitor. b Charging curves of the supercapacitor by pressing the TENG inatmosphere and high vacuum (P ~ 10−6 torr). c,d Charging curves of the supercapacitor in high vacuum c and in atmosphere d when an electronic watch is driven by the TENG simultaneously. e Charging curve of the supercapacitor when a temperature–humidity meter is driven by the TENG in high vacuum simultaneously. f Discharging curve of the supercapacitor when the TENG in atmosphere is unable to drive the temperature-humidity meter alone. g Thirty-two LED light bulbs (each with rated power of 0.75 W) are lit in complete darkness by the TENG in high vacuum, h Thirty-two LED light bulbs cannot be lit by the TENG in atmosphere, i two LED light bulbs are lit in complete darkness by the TENG in high vacuum; Scale bar, 4 cm
