A Triboelectric And Pyroelectric Hybrid Nanogenerator For Recovering Energy From Wave

As one of the most important forms of ocean energy,wave energy has received much attention from scholars at home and abroad for its efficient development and utilization.However,due to the low frequency of ocean wave energy(<1 Hz),the output power of traditional ocean wave energy harvesting devices(such as fluctuating air cylinder type and fluctuating piston type)based on the principle of electromagnetic induction(the output power is proportional to the square of mechanical energy frequency)is low.In recent years,with the continuous progress of material science,Triboelectric nanogenerator(TENG)based on the contact electrification of two materials has received a lot of attention from scholars at home and abroad.Because of its advantages of wide range of materials,low cost,and various types of mechanical energy(sliding,vibration,torsion,and friction),it has been demonstrated in various mechanical energy recycling such as wind energy,wave energy,and human kinetic energy.Especially important is that when the input mechanical energy is below 5 Hz,the output power density of TENG is higher than that of traditional electromagnetic generator,because the output power of TENG is proportional to the mechanical energy frequency,which provides a new solution idea for the efficient collection of low frequency wave energy in the ocean.Although researchers have made more progress in the collection of ocean wave energy by TENG,however,these studies ignore the energy form of seawater as a low-temperature cold source.To address the above research status,this paper proposes a hybrid generator(T-PENG)of triboelectric nanogenerator(TENG)and pyroelectric generator(PENG)for harvesting ocean wave energy.The TENG utilizes the frictional effect of waves to supply power externally,and the PENG couples a light-absorbing layer to supply power externally using the temporal temperature gradient between the heat generated by thermal conversion when the waves recede and the cooling effect played by the waves when they impact.It realizes the use of one wave action to generate two parts of output power.In the experiment,the power generation principle of T-PENG was first analyzed,the TPENG was prepared and tested based on the constructed experimental bench.The performance of the TENG and PENG parts in the T-PENG were tested separately,and the following factors were investigated: the influence of the structure of the T-PENG on the performance of the two parts under the operating condition;the mutual influence between the two parts of the TENG and the PENG;the influence of the operating parameters such as the photo-thermal conversion temperature of the light absorbing layer and the device placement angle on the two parts of the TENG and the PENG.Finally,the experimental results of the T-PENG performance show that the T-PENG is able to output two electrical signals in one working cycle,which can output 130 V and 1.9 μA under the most ideal working condition,and the PENG is 85 V and 0.65 μA respectively,and the highest power output can reach 305 μW at the external load of 200 MΩ.Finally,the application experiments are carried out in the device In the application demonstration of capacitor charging,the 220 μF capacitor was charged to 1.6 V within 13000 s using the analog wave source.