Friction nanogenerators are considered to be a device with a high open circuit voltage and have been used to drive ion sources, plasma sources, electrospinning and dielectric elastomers. However, high voltages of several thousand volts often require large The device area, high friction or external voltage doubler circuit can not fully meet the needs of practical applications; in addition, the open circuit voltage values reported in the literature also have large dispersion. How to use TENG to drive high efficiency under weak mechanical drive Producing a stable high voltage output is an important issue that needs to be solved.
Recently, the director of the Institute of Nano-Energy and Systems of the Chinese Academy of Sciences, the professor of the Georgia Institute of Technology Lifetime School, Wang Zhonglin, and the research team led by Yin Zhouping, a professor at Huazhong University of Science and Technology, have successfully developed a TENG stable super-charge mechanism. High voltage output method. The researchers found that by introducing a charge compensation channel composed of high voltage diodes in TENG, the open circuit voltage of TENG can be significantly improved. For contact separation type TENG, the open circuit voltage can be raised from about 230V to over 3300V. More than 10 times, if the generator is connected in parallel or corona, the open circuit voltage of the output can be further increased up to 7000V, and the high voltage capacitor can be charged to several thousand volts. The above high voltage can be lightly The steady output is achieved by pressing TENG. The researchers also designed an experimental method to directly measure the above high voltage. The charge compensation mechanism works by dissipating the charge in the TENG electrodes in the open circuit with diodes. Compensating to maintain the charge distribution in the electrode at the most favorable The state of generating high voltage output. The related theoretical analysis also explains the discreteness of the open circuit voltage measured in the experiment. Based on this high voltage TENG, a self-driven electrostatic adsorption system is fabricated, and the high voltage is supplied to the electrostatic chuck by pressing TENG. Successfully realized the adsorption and manipulation of conductors, semiconductors and insulators, and realized the weight of adsorption weight of about 0.35Kg. This work proposed a stable ultra-high voltage source based on TENG and high voltage generation mechanism, due to the mechanism Universality, it will also be applied to the voltage enhancement of other modes of TENG, and has broad application prospects in various occasions requiring ultra-high voltage sources of light weight, flexibility and low cost. Related results by Giant Voltage Enhancement via Triboelectric Charge Supplement Channel For Self-Powered Electroadhesion was published on the recent ACS Nano.
(a) Schematic diagram of the charge compensation channel; (b) Voltage enhancement effect of different TENG devices; (c) Comparison of the effect of charge compensation on the open circuit voltage of the TENG unit; (d) Voltage achieved by the self-driven electrostatic adsorption system at different compression times And adsorption force; (e, f) self-driven electrostatic adsorption system to achieve adsorption and manipulation of silicon wafers and heavy objects.
