Study On Triboelectric Generator Based On Carbonyl Iron-PDMS Composite Film

With the rapid development in 5G,artificial intelligence and Internet of Things,electronic devices,as the landing terminals of network communication technology,will meet the higher requirements on quantity and quality and it will be designed to be more wearable and implantable.In ordinary electronic equipments,batteries are often used as energy supplying solutions.The limited capacity and durability of batteries will become an important factor affecting the stability of electronic devices.In order to avoid these problems,people focus their attention on collecting the tiny energy in living environment and converting it into usable electrical energy.Compared with other energy harvesting technology,Triboelectric Nanogenerator(TENG)has the advantages of simple structure,low cost and fast response,which has been sought after by people.However,high internal resistance,limited output power,and strict excitation conditions limit its wide use.To solve these problems,this paper proposed a method of doping iron carbonyl in the PDMS layer to improve the performance of TENG.The structure of generator was designed and optimized to increase the practical range of TENG.The major work accomplished are as follows:(1)Research on triboelectricity of carbonyl iron-PDMS composite filmsCopper electrodes were made by flexible printed circuit board.The mixsure of carbonyl iron and PDMS was spun on the copper electrode to make composite films.And triboelectric generator was fabricated by copper electrode and copper electrode with carbonyl iron-PDMS composite films(CI-TEG).To optimize the CI-TEG output performance,CI-TEG were fabricated with various doped carbonyl iron concentrations and tested by electrometer.From the analysis of the results,when the doping concentration is 0.8 wt%,the open circuit voltage and short circuit current of CI-TEG both reached maximum at 241 V and 36.1 ?A,respectively.And its maximum of output power was at 3.52 m W.Compared with the triboelectric generator based on pure PDMS,its output power was increased by 6 times,and its internal resistance was reduced from30 M? to 9 M?.It could directly light up 90 commercially available LEDs and charge47 ?F capacitor to 5 V in 280 s.In addition,CI-TEG showed excellent stability and durability: CI-TEG worked continuously for 250,000 cycles,with almost no performance degradation.After placed in an indoor environment for thirty days,compared to the first day,its open voltage droped about 9.6 %.(2)Application analysis of triboelectric generator based on iron carbonate-PDMS composite filmTo harvest vehicle body frame vibrations energy,we designed and manufactured a resonant triboelectric generator(R-TEG)based on carbonyl iron-PDMS composite films.When the excitation was 1.5 g with 15 g external mass block,its working bandwidth was 4 Hz.The open circuit voltage of the R-TEG reached its maximum at38.1 V,and it can charge the 4.7 ?F capacitor to 3.3 V in 330 s.To harvest human mechanical energy,we designed and manufactured a portable clpper-structure triboelectric generator(C-TEG)When the external excitation was 4.1 Hz,the output open circuit voltage of the C-TEG peaked at 100 V,and its short-circuit current reached10 ?A.C-TEG could directly light up 20 green LEDs and charge 10 ?F capacitor to 4 V in 261 s.