Variable Capacitor Energy Harvesting Based on Polymer Dielectric and Composite Electrode
| Autor: | Leopold Georgi, Yujia Yang, Jörg Bauer, K-D. Lang, Robert Hahn, Uwe Maaß |
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| Rok vydání: | 2016 |
| Předmět: |
Tantalum capacitor
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Vacuum variable capacitor Polymer capacitor Composite electrode Electrochemistry Variable capacitor Equivalent circuit Electrical and Electronic Engineering Composite material Energy harvesting High-κ dielectric |
| Zdroj: | Energy Harvesting and Systems. 3:277-285 |
| ISSN: | 2329-8766 2329-8774 |
| Popis: | This work focuses on a polymer based capacitive harvester which can be fabricated with help of roll-to-roll and low cost printing methods. In contrast to electrostatic MEMS based parallel plate transducers or dielectric elastomer systems here, the capacitance is varied as function of the mechanical load by changing of the top electrode area with help of an electrically conducting composite elastomer. In case of a composite elastomer electrode the maximum capacitance in compressed state does not only depend on the thickness and permitivity of the dielectric but first of all on the quality of the interface and the micro structure of the conducting phase in the composite electrode at the interface which was investigated by FEM Maxwell simulation. An equivalent circuit model is used to study the influence of the leakage current inside the dielectric and the bulk resistivity of the elastomer electrode. First experiments with state of the art polymer, thin film and novel printed dielectrics in contact with elastomer electrodes have been performed to prove the harvesting principle at low frequencies. Charges between 25 and 70 nAs per cm2 have been transferred per cycle at 100 V/200 V while the maximum capacity was between 0.4 and 0.8 nF/cm2. |
| Databáze: | OpenAIRE |
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