Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is one of the most widely studied conductive polymers, owing to its excellent electrical, optical, and mechanical properties, with various applications such as organic electrochemical transistors, electrochromics, and flexible/stretchable supercapacitors. The charging mechanism of PEDOT:PSS supercapacitors has been traditionally believed to be faradaic, which involves the transfer of charge across the electrode/electrolyte interface. In the present work, however, robust experimental evidence suggests that the PEDOT:PSS supercapacitors mainly store and deliver charge nonfaradaically. The various electrochemical properties of PEDOT:PSS electrical double layer capacitors (EDLCs) are clearly distinguishable from those of polyaniline (PANI) pseudocapacitors, which store charge faradaically. Owing to the nonfaradaic mechanism, the frequency response of PEDOT:PSS supercapacitors is comparable to that of state-of-the-art ultrafast EDLCs with carbon-based electrodes, making them suitable for high-frequency applications such as 60 Hz AC line filtering. This result is of great importance for the fundamental understanding of the charging mechanism of mixed ionic-electronic conducting polymers, such as PEDOT:PSS, and is expected to contribute to the development of various electrochemical devices based on this type of material.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF‐2020R1A2C2008798) and the Korea University. We would like to thank Mr. Byeong‐Hyeon Lee, X‐ray open lab in Korea Institute of Science and Technology, for the help with Grazing incident X‐ray diffraction measurement and interpretation
This work was supported by the National Research Foundation of Korea (NRF-2020R1A2C2008798) and the Korea University. We would like to thank Mr. Byeong-Hyeon Lee, X-ray open lab in Korea Institute of Science and Technology, for the help with Grazing incident X-ray diffraction measurement and interpretation
© 2022 Wiley-VCH GmbH.
- AC line filtering
ASJC Scopus subject areas
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)