| As the energy crisis worsens,searching a method that can transform environmental clean energy becomes urgent.Recently,triboelectric nanogenerators(TENG)have shown great potential in collecting low-frequency mechanical energy of the environment owing to their unique working mechanism.Until now,there have been many research work using TENG to collect water wave energy.Moreover,the interference of water vapor will seriously affect the output performance of TENG,so the effective packaging of TENG will help to improve energy conversion efficiency.In order to collect water wave energy more efficiently,some research work have incorporated electromagnetic generators into hybrid devices to achieve broadband energy harvesting.Wind energy and raindrop energy are one of common energy sources in nature,although the EMG collecting wind energy is relatively mature,the cost is still relatively high.Up to now,TENG has great potential in collecting raindrop energy and wind energy due to its advantages of low cost and high power density.However,the changing wind direction and the weak mechanical impact of raindrops limit the efficient collection of wind and rain energy.Though some TENGs can both collect wind and rain energy,the device structure still needs to be further optimized.Based on the above research situation,the main work of this paper is to design a marine power system which can harvest water wave energy,and at the same time,the electric energy converted from water wave energy also can be applied to desalinate seawater.Another work is to design a hybrid device to collect wind and rain energy synchronously which is expected to be used as a self-powered wind and rain alarm.The main research content for this thesis are as follows:In Chapter 2,a ship-type hybrid nanogenerator(SHNG)for collecting water wave energy in the ocean has been constructed,from which TENG and EMG can simultaneously utilize two different energy conversion mechanisms.The SHNG includes three parts of TENG and a part of EMG,Under a working frequency of 2 Hz,the contact-separation TENG can produce a peak power of about 800 ?W under a resistive load of 20 M? and the peak power of EMG can achieve 9mW under a resistive load of 100?.Regarding the charging voltage of the capacitor,SHNG can achieve a higher charging voltage and a faster charging speed compared with a single TENG or EMG.A transformer was employed to decrease the impedance of the TENG to achieve impedance match of TENG and EMG.SHNG has been proven to effectively desalinate seawater,a desalination rate 29.4% can be reached after 3h.The SHNG also has been tested to be used as a power source which can power a digital temperature-humidity meter.Apart from that,it can also power a radio-frequency emitter to set up wireless positioning system.This work propose an effective approach to capture blue energy,At the same time,access to more water for the sea and work to achieve marine rescue is expected to be achieved through SHNG.Chapter 3 introduces the hybrid triboelectric nanogenerators(WR-TENG)that can both collect wind energy and raindrop energy simultaneously.The WR-TENG includes a freestanding mode TENG harvesting wind energy and a contact separation mode TENG harvesting raindrop energy.In order to adapt to the varied wind direction,a vane is devised and applied,which can adapt to the changing wind direction and wind speed frequently.The triboelectric nanogenerators(R-TENG)that collect raindrop energy are designed to be airbag-type to protect the internal electrodes.This unique airbag has a good elastic recovery function.The airbag can withstand the mechanical effects of different raindrops.Additionally,the W-TENG is devised to locate below the R-TENG to avoid mutual interference.This work proposes a new method based on TENG to collecting wind energy and raindrops energy simultaneously.Furthermore,it shows good potential in monitoring the environment,which will facilitate the workers in the remote area where electricity is scarce. |
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