Senior Research Assistant, National Electronics and Computer Technology Center, National Science and Technology Development Agency, Thailand
Printed Flexible Microsupercapacitors Based on Fractal Design Electrode
Sriprachuabwong (1,*), C. Poochai (1), A. Srikhaow (1) and A. Tuantranont (1)
(1) Thai Organic & Printed Electronics Innovation Center (TOPIC), National Electronics and Computer Technology Center (NECTEC), National Science and Technology Development Agency (NSTDA), 112 Phahonyothin Road, Khlong Nueng, Khlong Luang District, Pathumthani 12120, THAILAND
Microsupercacitors, they are micro-scale energy storage devices, and developed for flexible and miniaturized electronics devises in order to correspond with the demand of lightweight, flexible and high performance storage devices . Mostly, microsupercapacitors development are studied with varieties of active materials electrode which fabricated by simple interdigitated pattern . Another way, there are a few of research articles considerate to study the effect of electrode pattern. Hilbert fractal design have demonstrated to enhance areal and volumetric capacitance of microsupercapacitors . However, electrode-deposited method that is reactive radio frequency sputtering deposition are complicated and not suitable for large scale and flexible substrate. In this work, we have demonstrated high performance microsupercapacitor which prepared by screen printing technique on flexible substrate. Effect of narrow track and wide track of fractal electrode on areal capacitance at different gap distances were studied. Electrode active material was prepared with composite of activated carbon, carbon black and polyvinylidene difluoride (PVDF) in N-methyl-2-pyrrolidone (NMP) solvent, and polyvinyl alcohol (PVA) dissolved in sulfuric acid use as a gel electrolyte. Both electrode active material and gel electrolyte were screen printed on PET substrate. Efficacy of microsupercapacitor, areal capacitance was evaluated by cyclic voltammetry and galvanostatic charge-discharge method. The results found that narrow track electrode at gap distance of 200 micron provide the highest areal capacitance comparative with other design at similar areal current density as shown in Fig 2. The areal capacitance of four cell parallel circuit is quite high to 30,751 μF·cm-2 at current density of 52.9 μA·cm-2. This study we can show that fractal design electrode is a strategy to improve performance of microsupercapacitor for miniaturized energy storage system.
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Chakrit Sriprachuabwong received the BSc (Honours) in Chemistry from Bansomdejchophraya Rajabhat University, Thailand in 2005. He obtained his MSc degrees in Material Science from King Mongkut’s University of Technology North Bangkok, Thailand in 2010. He has been working as senior research assistant in Thai Organic & Printed Electronics Innovation Center (TOPIC), National Science and Technology Development Agency. His research interests include, printed electronics, nanomaterials, electrochemical sensor, energy storage devices and renewable energy technology. He has over 30 publications in these fields.
The National Electronics and Computer Technology Center (NECTEC) was established on 16 September 1986 under the National Science and Technology Development Agency (NSTDA), Ministry of Science and Technology. At present, NECTEC is a statutory government organisation with its main responsibilities of under taking, supporting and promoting the research and development of electronics and computer technologies. NECTEC also provides linkage between research communities and industries through the established industrial clusters and programmes