Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Electrochemical Characteristics of a EGaIn Liquid Metal Electrode for Supercapacitor Applications

수퍼커패시터 응용을 위한 EGaIn 액체 금속 전극의 전기화학 특성 연구

  • SO, JU-HEE (Research Institute of Industrial Technology Convergence, Korea Institute of Industrial Technology) ;
  • KOO, HYUNG-JUN (Dept. of Chemical & Biomolecular Engineering, Seoul National University of Science and Technology)
  • 소주희 (한국생산기술연구원 융합생산기술연구소) ;
  • 구형준 (서울과학기술대학교 화공생명공학과대학교)
  • Received : 2016.03.16
  • Accepted : 2016.04.30
  • Published : 2016.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

Recent years, supercapacitors have been attracting a growing attention as an efficient energy storage, due to their long-lifetime, device reliability, simple device structure and operation mechanism and, most importantly, high power density. Along with the increasing interest in flexible/stretchable electronics, the supercapacitors with compatible mechanical properties have been also required. A eutectic gallium-indium (EGaIn) liquid metal could be a strong candidate as a soft electrode material of the supercapacitors because of its insulating surface oxide layer for electric double layer formation. Here, we report the electrochemical study on the charging/reaction process at the interface of EGaIn liquid metal and electrolyte. Numerical fitting of the charging current curves provides the capacitance of EGaIn/insulating layer/electrolyte (${\sim}38F/m^2$). This value is two orders of magnitude higher than a capacitance of a general metal electrode/electrolyte interface.

Keywords

References

  1. G. Wang, L. Zhang and J. Zhang. "A review of electrode materials for electrochemical supercapacitors", Chem. Soc. Rev., Vol. 41, No. 2, 2012, p. 797-828. https://doi.org/10.1039/C1CS15060J
  2. Z. Weng, Y. Su, D.-W. Wang, F. Li, J. Du and H.-M. Cheng. "Graphene-Cellulose Paper Flexible Supercapacitors", Adv. Energy Mater., Vol. 1, No. 5, 2011, p. 917-922. https://doi.org/10.1002/aenm.201100312
  3. T. Chen and L. Dai. "Flexible supercapacitors based on carbon nanomaterials", J. Mater. Chem. A, Vol. 2, No. 28, 2014, p. 10756-10775. https://doi.org/10.1039/c4ta00567h
  4. M. F. El-Kady, V. Strong, S. Dubin and R. B. Kaner. "Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors", Science, Vol. 335, No. 6074, 2012, p. 1326-1330. https://doi.org/10.1126/science.1216744
  5. V. L. Pushparaj, M. M. Shaijumon, A. Kumar, S. Murugesan, L. Ci, R. Vajtai, R. J. Linhardt, O. Nalamasu and P. M. Ajayan. "Flexible energy storage devices based on nanocomposite paper", PNAS, Vol. 104, No. 34, 2007, p. 13574-13577. https://doi.org/10.1073/pnas.0706508104
  6. I. Shown, A. Ganguly, L.-C. Chen and K.-H. Chen. "Conducting polymer-based flexible supercapacitor", Energy Sci. Eng., Vol. 3, No. 1, 2015, p. 2-26. https://doi.org/10.1002/ese3.50
  7. M. D. Dickey, R. C. Chiechi, R. J. Larsen, E. A. Weiss, D. A. Weitz and G. M. Whitesides. "Eutectic Gallium-Indium (EGaIn): A Liquid Metal Alloy for the Formation of Stable Structures in Microchannels at Room Temperature", Adv. Funct. Mater., Vol. 18, No. 7, 2008, p. 1097-1104. https://doi.org/10.1002/adfm.200701216
  8. R. C. Chiechi, E. A. Weiss, M. D. Dickey and G. M. Whitesides. "Eutectic Gallium-Indium (EGaIn): A Moldable Liquid Metal for Electrical Characterization of Self-Assembled Monolayers", Angew. Chem. Int. Ed., Vol. 47, No. 1, 2008, p. 142-144. https://doi.org/10.1002/anie.200703642
  9. H.-J. Koo, J.-H. So, M. D. Dickey and O. D. Velev. "Towards All-Soft Matter Circuits: Prototypes of Quasi-Liquid Devices with Memristor Characteristics", Adv. Mater., Vol. 23, No. 31, 2011, p. 3559-3564. https://doi.org/10.1002/adma.201101257
  10. J.-H. So, H.-J. Koo, M. D. Dickey and O. D. Velev. "Ionic Current Rectification in Soft-Matter Diodes with Liquid-Metal Electrodes", Adv. Funct. Mater., Vol. 22, No. 3, 2012, p. 625-631. https://doi.org/10.1002/adfm.201101967
  11. J.-H. So, J. Thelen, A. Qusba, G. J. Hayes, G. Lazzi and M. D. Dickey. "Reversibly Deformable and Mechanically Tunable Fluidic Antennas", Adv. Funct. Mater., Vol. 19, No. 22, 2009, p. 3632-3637. https://doi.org/10.1002/adfm.200900604
  12. J.-H. So and M. D. Dickey. "Inherently aligned microfluidic electrodes composed of liquid metal", Lab Chip, Vol. 11, No. 5, 2011, p. 905-911. https://doi.org/10.1039/c0lc00501k
  13. S. Zhu, J.-H. So, R. Mays, S. Desai, W. R. Barnes, B. Pourdeyhimi and M. D. Dickey. "Ultrastretchable Fibers with Metallic Conductivity Using a Liquid Metal Alloy Core", Adv. Funct. Mater., Vol. 23, No. 18, 2013, p. 2308-2314. https://doi.org/10.1002/adfm.201202405
  14. E. Palleau, S. Reece, S. C. Desai, M. E. Smith and M. D. Dickey. "Self-Healing Stretchable Wires for Reconfigurable Circuit Wiring and 3D Microfluidics", Adv. Mater., Vol. 25, No. 11, 2013, p. 1589-1592. https://doi.org/10.1002/adma.201203921
  15. H.-J. Koo, S. T. Chang and O. D. Velev. "Ion-Current Diode with Aqueous $Gel/SiO_2$ Nanofilm Interfaces", Small, Vol. 6, No. 13, 2010, p. 1393-1397. https://doi.org/10.1002/smll.200902069
  16. Y. Lin, C. Cooper, M. Wang, J. J. Adams, J. Genzer and M. D. Dickey. "Handwritten, Soft Circuit Boards and Antennas Using Liquid Metal Nanoparticles", Small, Vol. 11, No. 48, 2015, p. 6397-6403. https://doi.org/10.1002/smll.201502692
  17. A. J. Bard and L. R. Faulkner. "Electrochemical Methods: Fundamentals and Applications". (Wiley, 2000).