Study On Hybridized Nanogenerator Based On Honeycomb-like Three Electrodes For Ocean Energy Harvesting

The rapid development of human civilization and the continuous advancement of the economy and society are largely dependent on non-renewable fossil energy sources such as coal,oil and natural gas.Therefore,in order to meet the increasing energy demand of human beings and adhere to the strategy of sustainable development,the development and utilization of renewable energy and clean energy have aroused wide attention worldwide.The ocean area accounts for more than 70% of the earth's surface.It contains abundant renewable energy and clean energy and exists in the form of wave energy,tidal energy,ocean current energy,heat energy,and osmotic energy.Among them,ocean surface waves are rich in kinetic energy and potential energy,so wave energy is an important part of ocean energy utilization.So far,the traditional electromagnetic generator(EMG)is the most important techniques for the collection of Marine energy.However,it is large in size,heavy in mass and large in consumption.More importantly,the wave vibration direction is random and the vibration frequency is low(< 5 Hz),an electromagnetic generator suitable for collecting high-frequency vibration energy is difficult to efficiently collect wave energy.In the meanwhile,triboelectirc nanogenerator(TENG)is a device that converts mechanical energy into electrical energy based on the coupling of triboelectrification and electrostatic induction.It has the advantages of high energy conversion efficiency,low cost,strong structural flexibility,rich material selection and high output at low frequency.It can be used in self-driven sensing,environmental energy and other aspects.Therefore,TENG has a unique advantage in terms of ocean energy collection.Based on the triboelectirc nanogenerator technology and the effective collection of blue energy,this work studied and designed a new structure for efficiently collecting wave energy,which provided a novel and effective method for large-scale collection of blue energy.The main research work is as follows:In this work,a wave nanogenerator(How-NG)based on hybrid honeycomb three-electrode structure is proposed,which consists of triboelectric nanogenerator(TENG)and electromagnetic generator(EMG).Based on the unique design of electrode structure,How-NG has two working modes--independent layer slip mode and vertical contact separation mode,which can collect two forms of wave energy respectively,namely kinetic energy and potential energy of ocean surface wave.At the same time,we tested the output performance of the TENG part and the EMG part under different working conditions.The experimental results show that,when the slip displacement is 3.5 cm and the working frequency is 4 Hz,the open-circuit voltage of TENG can reach ~ 550 V,the amount of transferred charge can reach ~ 140 nC,and the maximum output energy of TENG in one cycle can reach 21.7 ?J under this condition.The EMG has a short-circuit current of ~4.65 mA and an open circuit voltage of ~3 V.When the external load is 350 ?,the EMG can achieve a maximum output power of 8.23 ?W.Furthermore,the design of the honeycomb three-electrode structure enables the How-NG to adapt to the randomness of the wave vibration and to collect the energy of the wave vibration from all directions and angles.In addition,by adjusting the weight of the magnet to achieve different resonance parameters,The How-NG in the resonant state can collect ocean energy more effectively.In practical applications,How-NG can charge a 4.7 ?F commercial capacitor to 2 V in 23 s.Finally,the two basic units are assembled vertically in a sealed cylindrical acrylic case,which can drive hundreds of green LEDs by collecting the energy of the water wave vibrations.The device can be laid out in large quantities on the ocean to form a collection array,promising large-scale access to blue energy.This work provides a novel and effective method for large-scale collection of blue energy from the ocean.