Electroactivity of 3D conducting polymers in water-in-salt electrolyte and their electrochemical capacitor performance

Electrochemical capacitors show high power density but suffer from low energy density. The use of pseudocapacitive material can increase the cell capacitance and therefore increase the device energy density. In this work, we show that using microtubular conducting polymers, as polypyrrole (PPy) and...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-01, Vol.880, p.114822, Article 114822
Main Authors: Martins, Vitor L., Obana, Thiago T., Torresi, Roberto M.
Format: Article
Language:English
Subjects:
Activated carbon
Aqueous electrolytes
Capacitors
Conducting polymers
Electroactivity
Electrode polarization
Electrolytes
Electrolytic cells
Flux density
Highly concentrated aqueous electrolyte
Mass balance
Open circuit voltage
PEDOT
Polymers
Polypyrroles
PPy
Supercapacitor
WiSE
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Summary:Electrochemical capacitors show high power density but suffer from low energy density. The use of pseudocapacitive material can increase the cell capacitance and therefore increase the device energy density. In this work, we show that using microtubular conducting polymers, as polypyrrole (PPy) and poly(3,4-ethylenedioxythiophene) (PEDOT), alongside activated carbon (AC) in asymmetrical devices, and highly concentrated aqueous electrolyte (or water-in-salt electrolyte, WiSE), is possible to maintain the polymers electroactivity at the negative polarization and take advantage of the electrolyte electrochemical stability. The polymers electrochemical behaviours were compared in WiSE and aqueous acidic solution, which hinted that the polymers charge compensation are different in the different electrolytes. PPy-AC and PEDOT-AC cells can reach 2.6 and 2.8 V, respectively, and electrodes mass balance greatly depends on the polymers open circuit potential before and after cycling [Display omitted]
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114822