A Filter Paper‐Based Nanogenerator via Water‐Drop Flow

Abstract

proposed to harvest the ultrasonic wave's energy using zinc oxide (ZnO) nanowire arrays, [9] the nanogenerator has entered a period of rapid development. [10][11][12][13] Various energies have been harvested using many kinds of nanogenerators, [4] such as triboelectric nanogenerators, [13] PENGs, [14] thermal-electric nanogenerators, [15] and photoelectric nanogenerators. [16] In addition, the as-harvested energy has various resources, such as wind, [17][18][19] heat energy, [20,21] solar power, [22] vibration, [23,24] mechanical energy, [25] electromagnetic waves, [26] chemical energy, [27] and water energy. [11,28,29] Therein, the nanogengerator induced from water-flow [30][31][32][33][34] and water evaporation [29,35] is a majority part of the water energy nanogenerator. Generally, the energy-produced principle from water-flow and water evaporation could be divided into two categories according to the surface properties of the nanogenerator. On the one hand, as the ionic solution

Charge Trapping‐Based Electricity Generator (CTEG): An Ultrarobust and High Efficiency Nanogenerator for Energy Harvesting from Water Droplets

“…[26] Instantaneous current peaks higher than 2 mA can be generated by a droplet falling on a charged surface with σ = 0.35 mC m −2 (Figure 2c). This current value is substantially higher than previous reported values, [4,[27][28][29][30][31][32] including the recent DEG approach [9] (Figure 2d; Table S1, Supporting Information). The current response is based on electrostatic induction and can be understood as follows: 1) before a droplet touches the wire, all countercharges induced by the trapped charges are located at the bottom electrode; 2) upon the spreading droplet touches the wire, the countercharges transfer from the bottom electrode to the top electrode, and an electric current signal is generated; 3) after the droplet bouncing off or sliding downhill, the countercharges are again accumulated at the bottom electrode, ready for electricity generation from the next droplet.…”

“…d) Comparison of the instantaneous peak current value obtained in this work with other reports. [4,[27][28][29][30][31][32] height of 4.3 cm, the maximum spreading area is around 0.7 cm 2 . The maximum transferred charge densities according to Figure 2f are 0.34, 0.19, and 0.07 mC m −2 for these three samples.…”

WITHDRAWN: Power Generation by Water Transpiration from Microporous Alumina

“…However, the observed voltage was only microvolts/cm and the fabrication and handling of CNTs is incompatible with large-scale applications. Similarly, it has been observed that a few millivolts can be generated by using carbon black 20 , graphene oxide 27,28 , monolayer graphene 29,30 , as well as carbon-based hybrid systems grown on oxide nanowire networks 31 or cellulose-based lter paper printed with multi-walled CNTs 32,33 . However, most of these carbon-based materials adhere only weakly to substrates, making devices rather fragile and hard to scale up, and the output voltage was below 100 mV/cm 2 range at the largest 22,27,29,30,34,35 .…”

Paper-based triboelectric nanogenerators and their applications: a review

“…Regarding height sensors, Xia et al proposed a stacked 3D zigzag-structured P-TENG [ 70 ], which displayed different output signals depending on the changes in height of a falling object or on the impact when this object came into contact with the P-TENG. To increase the overall output, the paper in the zigzag-structured P-TENG was coated with commercial conductive ink.…”