Е-Публикации
Технически университет - София

Abstract: This paper presents the electrical characterization of a flexible supercapacitor with a unique architecture incorporating a piezoelectric PVDF-TrFE film sandwiched between PEDOT:PSS:Graphene and LiTaO3 as a charge-generating and charge-transferring layer. Impedance spectroscopy measurements reveal frequency-dependent capacitance behavior, reflecting the contributions of both piezoelectric and supercapacitor capacitances. Charge–discharge cycling tests demonstrate the device’s energy storage capabilities and indicate a potential enhancement through the piezoelectric effect. Supercapacitor cycling tests demonstrate the device’s energy storage capabilities, with an estimated specific capacitance of 10.14 F/g, a power density of 16.3 W/g, an energy density of 5.63 Wh/kg, and a Coulombic efficiency of 96.1% from an active area of 1 cm2. The proposed structure can serve as an independent harvester and storage for low-power, wearable sensors.

References

1. Kharade P.M. Salunkhe D.J. Review Article on Supercapacitors: Emerging Electrodes and Materials Int. J. Sci. Res. Technol. 2025 2 70 76 10.5281/zenodo.14837794
2. Hota A. Patel U. Kumar A. Mukherjee S. Roy A. Piezoelectric supercapacitors: Current trends and future outlook Phys. Scr. 2024 99 112001 10.1088/1402-4896/ad7915
3. Chodankar N. Padwal C. Duc Pham H. Ostrikov K. Jadhav S. Mahale K. Yarlagadda P.K.D.V. Huh Y.S. Han Y.-K. Dubal D. Piezo-supercapacitors: A new paradigm of self-powered wellbeing and biomedical devices Nano Energy 2021 90 Pt A 106607 10.1016/j.nanoen.2021.106607
4. Sinha P. Sharma A. The prospect of supercapacitors in integrated energy harvesting and storage systems Nanotechnology 2024 35 382001 10.1088/1361-6528/ad5a7b 38904267
5. Dar M.A. Majid S.R. Satgunam M. Siva C. Ansari S. Arularasan P. Ahamed S.R. Advancements in Supercapacitor electrodes and perspectives for future energy storage technologies Int. J. Hydrogen Energy 2024 70 10 28 10.1016/j.ijhydene.2024.05.191
6. Aleksandrova M. Pandiev I. Synergistic integration of energy harvesters and supercapacitors for enhanced performance Heliyon 2025 11 e42808 10.1016/j.heliyon.2025.e42808 40084030
7. He A. He J. Cao L. Chen J. Cheng B. Ma R. Ding Y. Yang G. Yi F. Flexible Supercapacitor Integrated Systems Adv. Mater. Technol. 2024 9 2301931 10.1002/admt.202301931
8. Mondal S. Thakur S. Maiti S. Bhattacharjee S. Kumar K. Chattopadhyay, Self-Charging Piezo-Supercapacitor: One-Step Mechanical Energy Conversion and Storage ACS Appl. Mater. Interfaces 2023 15 8446 8461 10.1021/acsami.2c17538 36719930
9. Jadhav S. Pham H.D. Padwal C. Chougale M. Brown C. Motta N. Ostrikov K. Bae J. Dubal D. Enhancing Mechanical Energy Transfer of Piezoelectric Supercapacitors Adv. Mater. Technol. 2022 7 2100550 10.1002/admt.202100550
10. Gao X. Zhang Y. Zhao Y. Yin S. Gui J. Sun C. Guo S. Heterointerface engineering and piezoelectric effect enhanced performance of self-charging supercapacitors power cell Nano Energy 2022 91 106701 10.1016/j.nanoen.2021.106701
11. Krishnamoorthy K. Pazhamalai P. Manoharan S. Ali N. Kim S.-J. Recent trends, challenges, and perspectives in piezoelectric-driven self-chargeable electrochemical supercapacitors Carbon Energy 2022 4 833 855 10.1002/cey2.202
12. Song R. Jin H. Li X. Fei L. Zhao Y. Huang H. Chan H.L.W. Wang Y. Chai Y. A rectification-free piezo-supercapacitor with a polyvinylidene fluoride separator and functionalized carbon cloth electrodes J. Mater. Chem. A 2015 3 14963 14970 10.1039/C5TA03349G
13. Parida K. Bhavanasi V. Kumar V. Wang J. Lee P.S. Fast charging self-powered electric double layer capacitor J. Power Sources 2017 342 70 78 10.1016/j.jpowsour.2016.11.083
14. Gilshteyn E.P. Amanbaev D. Silibin M.V. Sysa A. Kondrashov V.A. Anisimov A.S. Kallio T. Nasibulin A.G. Flexible self-powered piezo-supercapacitor system for wearable electronics Nanotechnology 2018 29 325501 10.1088/1361-6528/aac658 29781448
15. Krishnamoorthy K. Pazhamalai P. Mariappan V.K. Nardekar S.S. Sahoo S. Kim S.J. Probing the energy conversion process in piezoelectric-driven electrochemical self-charging supercapacitor power cell using piezoelectrochemical spectroscopy Nat. Commun. 2020 11 2351 10.1038/s41467-020-15808-6 32393749
16. Selvam S. Praveenkumar S. Yim J.-H. Cyclodextrin incorporated textile supercapacitor/piezo-triboelectric nanogenerator hybrid system for versatile temperature dependent wearable wireless devices Chem. Eng. J. 2024 482 148929 10.1016/j.cej.2024.148929
17. Jegan R. Nimi W.S. On the development of low power wearable devices for assessment of physiological vital parameters: A systematic review J. Public Health 2024 32 1093 1108 10.1007/s10389-023-01893-6 37361281
18. Azeem M. Shahid A. Masin I. Petru M. Design and development of textile-based wearable sensors for real-time biomedical monitoring; a review J. Text. Inst. 2025 116 80 95 10.1080/00405000.2024.2318500
19. Alsadoon A. Al-Naymat G. Jerew O.D. An architectural framework of elderly healthcare monitoring and tracking through wearable sensor technologies Multimed. Tools Appl. 2024 83 67825 67870 10.1007/s11042-024-18177-0
20. Ban S. Lee H. Chen J. Kim H.-S. Hu H. Cho S.-J. Yeo W.-H. Recent advances in implantable sensors and electronics using printable materials for advanced healthcare Biosens. Bioelectron. 2024 257 116302 10.1016/j.bios.2024.116302 38648705
21. Aleksandrova M. Spray deposition of piezoelectric polymer on plastic substrate for vibrational harvesting and force sensing applications AIMS Mater. Sci. 2018 5 1214 1222 10.3934/matersci.2018.6.1214
22. Aleksandrova M. Kolev G. Dobrikov G. Denishev K. Theoretical Design and Fabrication Process for Perovskite LiTaO3-based Infrared Detectors Proceedings of the 2021 XXX International Scientific Conference Electronics (ET) Sozopol, Bulgaria 15–17 September 2021 1 4 10.1109/ET52713.2021.9580155
23. Sanna S. Neufeld S. Rüsing M. Berth G. Zrenner A. Schmidt W.G. Raman scattering efficiency in LiTaO3 and LiNbO3 crystals Phys. Rev. B 2015 91 224302 10.1103/PhysRevB.91.224302
24. Ali R.F. Gates B.D. Synthesis by Size Focusing of Lithium Tantalate Nanoparticles with a Tunable Second Harmonic Optical Activity arXiv 2024 2409.06825 10.1039/D4TC03938F
25. Shin E.-Y. Cho H.J. Jung S. Yang C. Noh Y.-Y. A High-k Fluorinated P(VDF-TrFE)-g-PMMA Gate Dielectric for High-Performance Flexible Field-Effect Transistors Adv. Funct. Mater. 2018 28 1704780 10.1002/adfm.201704780
26. Adel M.Y. Mohammed O.B. Younis A.T. Estimation of Equivalent Series Resistance (ESR) of Supercapacitors Using Charging/Discharging Kinetics ChemistryOpen 2025 14 e202400444 10.1002/open.202400444 39831848
27. Hang W. Zhou L. Shimizu J. Yuan J. Yamamoto T. Study on the Mechanical Properties of Lithium Tantalate and the Influence on its Machinability Int. J. Autom. Technol. 2013 7 644 653 10.20965/ijat.2013.p0644
28. Xiao J. Li Q. Bi Y. Cai M. Dunn B. Glossmann T. Liu J. Osaka T. Sugiura R. Wu B. et al. Understanding and applying coulombic efficiency in lithium metal batteries Nat. Energy 2020 5 561 568 10.1038/s41560-020-0648-z
29. Zhang L. Shi H.L. Wang L.Q. Wang N. Investigation on Capacitance Regeneration Characteristics of Supercapacitors during the Aging Tests IOP Conf. Ser. Earth Environ. Sci. 2020 464 012005 10.1088/1755-1315/464/1/012005
30. Gadermaier B. Resch L. Pickup D.M. Hanghofer I. Hanzu I. Heitjans P. Sprengel W. Würschum R. Chadwick A.V. Wilkening H.M.R. Influence of defects on ionic transport in LiTaO3—A study using EXAFS and positron annihilation lifetime spectroscopy Solid State Ion. 2020 352 115355 10.1016/j.ssi.2020.115355
31. Lai X. Zhou L. Zhu Z. Zheng Y. Sun T. Shen K. Experimental investigation on the characteristics of coulombic efficiency of lithium-ion batteries considering different influencing factors Energy 2023 274 127408 10.1016/j.energy.2023.127408
32. Yadav N. Yadav N. Hashmi S.A. Ionic liquid incorporated, redox-active blend polymer electrolyte for high energy density quasi-solid-state carbon supercapacitor J. Power Sources 2020 451 227771 10.1016/j.jpowsour.2020.227771

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