ACS Nano · 2013 · 260 citations · 33 references
EngineeringElectrical EngineeringMaterials ScienceElectronic MaterialsLow-power DesignNanotechnologyNanoenergy MaterialsRenewable Energy Power ConversionNanogeneratorsPower DensityPower Density EnhancementPower OutputPower Output CapabilitySliding Mode ControlTriboelectric NanogeneratorsVoltage
Nanogenerators typically produce high voltage but low current, resulting in low power output. This work introduces a general method that dramatically increases the instantaneous output power while preserving the total energy delivered. By employing an off–on–off contact switching scheme during mechanical actuation, the charging/discharging interval is shortened, yielding a much larger instantaneous current pulse without reducing voltage. The approach delivers instantaneous current peaks of 0.53 A and 142 W (500 Ω load) and current densities up to 1325 A m⁻² with power densities of 3.6 × 10⁵ W m⁻²—over 2500‑ and 1100‑fold improvements over previous records—and demonstrates 104 A m⁻² and 1.4 × 10⁴ W m⁻² in a rotating disk TENG, confirming its applicability to both piezoelectric and triboelectric generators as a high‑pulsed‑power source.
A nanogenerator (NG) usually gives a high output voltage but low output current, so that the output power is low. In this paper, we developed a general approach that gives a hugely improved instantaneous output power of the NG, while the entire output energy stays the same. Our design is based on an off–on–off contact based switching during mechanical triggering that largely reduces the duration of the charging/discharge process, so that the instantaneous output current pulse is hugely improved without sacrificing the output voltage. For a vertical contact-separation mode triboelectric NG (TENG), the instantaneous output current and power peak can reach as high as 0.53 A and 142 W at a load of 500 Ω, respectively. The corresponding instantaneous output current and power density peak even approach 1325 A/m2 and 3.6 × 105 W/m2, which are more than 2500 and 1100 times higher than the previous records of TENG, respectively. For the rotation disk based TENG in the lateral sliding mode, the instantaneous output current and power density of 104 A/m2 and 1.4 × 104 W/m2 have been demonstrated at a frequency of 106.7 Hz. The approach presented here applies to both a piezoelectric NG and a triboelectric NG, and it is a major advance toward practical applications of a NG as a high pulsed power source.
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Flexible triboelectric generator
Feng Ru Fan, Zhong‐Qun Tian, Zhong Lin Wang · Nano Energy · 2012 · 6.5K citations