Ultrafast PEDOT:PSS/H2SO4 Electrical Double Layer Capacitors: Comparison with Polyaniline Pseudocapacitors
- Authors
- Kim, Kein; Park, Jinwoo; Lee, Junyoung; Suh, Soomin; Kim, Woong
- Issue Date
- Mar-2023
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- AC line filtering; electrochemistry; polymers; pseudocapacitors; supercapacitors
- Citation
- CHEMSUSCHEM, v.16, no.5
- Journal Title
- CHEMSUSCHEM
- Volume
- 16
- Number
- 5
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91792
- DOI
- 10.1002/cssc.202202057
- ISSN
- 1864-5631
1864-564X
- Abstract
- 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.
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