Performance of printable supercapacitors in an RF energy harvesting circuit |
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Affiliation: | 1. Wireless Communications Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam;2. Optoelectronics Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam;3. IT4Innovations, VSB-Technical University of Ostrava, 17. listopadu 15/2172, Ostrava - Poruba 708 33, Czech Republic;4. Posts and Telecommunications Institute of Technology, Ho Chi Minh City, Vietnam;5. Center for Information Technology, Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Vietnam;6. Faculty of Electronics Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam;7. VSB-Technical University of Ostrava 17. listopadu 15/2172, 708 33 Ostrava - Poruba, Czech Republic |
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Abstract: | We report the fabrication of a supercapacitor on a plastic substrate with mass-production-compatible methods and its characterisation using galvanostatic and voltammetric methods. The supercapacitor is prepared in ambient conditions using activated carbon and an aqueous, non-acidic electrolyte. The obtained capacitances are 0.45 F and 0.21 F for device sizes of 4 cm2 and 2 cm2, respectively. Additionally, we demonstrate the utilisation of the supercapacitor in an autonomous energy harvesting and storage system. The RF energy harvester comprises a printed loop antenna and a half-wave organic diode rectifier operating at 13.56 MHz frequency. The harvested energy is stored in two supercapacitors connected in series to increase the maximum operating voltage. In order to power a device such as a sensor or a small indicator display, voltage regulation is needed. A voltage regulator, implemented as an application specific integrated circuit (ASIC), was designed for this purpose, and fabricated commercially. We demonstrate the ability of the harvester storage unit to power the regulator for hours with a constant regulator output voltage and power. The effect of supercapacitor charging time on the actual supercapacitor charging state is also discussed, as a slower charging rate is found to have a significant effect on the output of the supercapacitor. |
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Keywords: | Supercapacitor Ultracapacitor Electric double layer capacitor Energy harvesting Autonomous power source |
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