High-power charge pump rotational friction nanometers generator
(Triboelectric nanogenerator, TENG) by frictional electrification and electrostatic induction may environment mechanical energy efficient conversion of electrical energy, based on micro and nano energy of this development, since the driving system and the blue energy techniques Internet of things, implantable devices, to provide technical basis for the emerging field of energy is important to wear equipment, marine development. Nano-stage friction generator further restricted to the practical application of two aspects: First, the lower surface charge density generated by friction, so that the output performance of the device can not meet the needs of many practical applications; Second friction material at the interface wear and heat can affect the durability of the device, especially for rotary and sliding friction nano-generators, the problem is more prominent. 2018 reported from the charge pump and charge pump strategy friction nano-generators (Nano Energy, 2018,49,625) proposes to solve these problems an important idea, namely to restrain the charge by floating conductive layer, and through the pump injecting charge pump generator implemented in the floating layer. In the electromagnetic generator, the electromagnet excitation current is widely used by a magnetic field, similar to this, using the charge pumping strategies to replace the bound charge injection frictional electrostatic charge field excitation, theoretically bound charge density in the floating layer is limited only the dielectric breakdown strength. Based on this policy, the first time in the atmospheric environment to enhance the effective charge density 1mC / m 2 or more, to achieve 1.02mC / m 2 , to achieve a significant breakthrough. However, the friction and detaching work based nano-generators, since in this mode the output performance of the inherent limitations of the average output power, although the device has been enhanced, but still not demand high power applications. Need to study the rotational output of the device better friction performance nano the charge pump generator and the like is applied strategies to achieve higher power mode in separate layers. Recently, Beijing Institute of Nano Energy and Chinese Academy of Sciences academician Zhong Lin Wang team successfully apply the policy to the charge pump rotary friction nano generator (Rotary charge pumping triboelectric nanogenerator, RC-TENG), the to achieve high performance at low excitation output . RC-TENG consists of two portions of the main pump and TENG TENG, a rotary pump TENG TENG ordinary structure, the main TENG mainly includes a storage and output electrodes. Two parts by a novel synchronous rotation connection structure, so that charges can be efficiently and reliably injected from the main pump to the storage electrode TENG TENG\’s. These constraints charge storage electrode may have an effect similar to the friction surface charge induced output at the output electrode. Since the charge storage electrode may be constantly injected, such that the charge density is much higher than that achieved triboelectric charge density can be achieved with an ordinary method. Synchronous design without any rotation of the brush structure such that the above-described function can be realized, enhancing the reliability of the device. A single device to achieve the transfer charge amount 4.5μC, 9 times the normal charge density of about TENG rotation control, the maximum average power and average power density of the low frequency driving 2Hz could reach 78mW and 1.66kW / m 3 , more than 15 times the normal TENG control while having a saturated output ultrafast speed than 1s. Furthermore, scalability of the architecture may be achieved simultaneously actuated for a plurality of primary pumping TENG TENG is. When integrated four main TENG, the low-frequency driving can 2Hz maximum peak power of 658mW and 225mW average power is maximum. This design can also be effectively applied to the sliding TENG. Further, for the rotary TENG conventional construction, to improve the charge density often require more intense friction, which can lead to material wear and heat problems. A charge pump associated policy decoupling between the friction charge density and strength, so that a high charge density can be generated in the case where low friction and wear can be suppressed by adding a lubricant at the interface. Rotary TENG charge pump-based strategy will further promote the settlement of power output and durability TENG bottlenecks, and promote the practical application of high-power blue TENG in the field of energy. Related outcomes to \”Charge pumping strategy for rotation and sliding type triboelectric nanogenerators\” was published in the Advanced Energy Materials on.
The full text link: https: //onlinelibrary.wiley.com/doi/10.1002/aenm.202000605