Fabrication of Flexible Thin Film Thermoelectric Generator with Current-Assisted Hot Pressing on Bismuth-Telluride-Based Powders
| Autor: | HUANG, SHENG-XIONG, 黃聖雄 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 The objective of this research is to fabricate the planar flexible thermoelectric generator by current-assisted hot pressing treatment. The thermoelectric materials are bismuth telluride based ternary compounds in the procedure. The thermoelectric thin films are prepared via coating method with an average particle size of 5 μm powders. After that, the current-assisted hot pressing treatment is employed and the PU compostie films are coated to improve the thermoelectric properties of the films and the heat transfer inside the generator. In the hope of the maximum output power of the generator will be further enhanced. Under the following operating condition: hot pressing temperature at 330℃, pressure of 137MPa, hot pressing time (t1) 3min, current assisted hot pressing time (t2) 7min and current density 800 A/cm2, the results show that the open circuit voltage, short circuit current and maximum output power of 3 pairs of p-n thermoelectric generator are 22.41mV, 419.55μA and 2351.52 nW, respectively under the temperature difference 25℃, Compared to only hot pressing treatment, the open circuit voltage of the generator do not change significantly while the short circuit current and the maximum output power increased by 55.11% and 47.8%, respectively. When the PU composite films are used as the insulation protective layer, the maximum output power increased from 1976.36 to 2163.91nW which was 9.5% higher than non-added PU composite film under the hot side fixed at 50℃. The resistance of the generator dropped from 60.55Ω to 9.96Ω, a drop of 83.5%, under the 6cm bending radius. The bending cycle increased from 67 to 650, a great increase of 8.3 times, under the 10cm bending radius. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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