Journal
SMALL METHODS
Volume 6, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202101545
Keywords
charge injection; electrospinning; gradient charge confinement; mesoporous carbon; triboelectric series
Funding
- GIST Research Institute (GRI) - GIST [GK14650]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Republic of Korea) [20003970]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20003970] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, the energy efficiency of triboelectric nanogenerators (TENGs) was maximized by utilizing high-voltage charge injection (HVCI) to increase surface charge densities. The experiment successfully increased the output voltage by 40 times and the output current by 1300 times using the gradient charge-confinement method. This study provides a simple and effective approach to enhance the performance of TENGs.
As a method to maximize the energy efficiency of triboelectric nanogenerators (TENGs), high-voltage charge injection (HVCI) on the surface is a simple and effective method for increasing surface charge densities. In this study, positive and negative triboelectric series are controlled using a 3-layer gradient charge-confinement wherein the particle sizes of the mesoporous carbon spheres (mCSs) are sequentially arranged depending on the external surface area of the mCSs. In the gradient charge-confinement layers of this study, the mCS with different sizes perform charge transport from the surface to a deep position during HVCI while mitigating the charge loss through charge confinement to induce the high space charge densities. Through this process, the output voltage- which is initially 15.2 V-is measured to be 600 V after HVCI, thus representing an increase of about 40 times. Further, to amplify the low output current, which is a disadvantage of triboelectric energy, two types of electrical energy-triboelectric and electromagnetic energy-are produced in single mechanical motion. As a result, the output current produced by the cylindrical TENG and electromagnetic generator is recorded as being 1300 times higher, increasing from 12.8 1.1.A to 17.5 mA.
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