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Charge Storage Properties of Nanostructured Poly (3,4–ethylenedioxythiophene) Electrodes Revealed by Advanced Electrogravimetry

Laboratoire Interfaces et Systèmes Électrochimiques, CNRS, Sorbonne Université, LISE, UMR 8235, 75005 Paris, France
CEA, INAC-SyMMES, CNRS, University Grenoble Alpes, F-38000 Grenoble, France
Institute of Inorganic Chemistry, University of Goettingen, Tammannstrasse 4, 37077 Goettingen, Germany
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 962;
Received: 5 June 2019 / Revised: 23 June 2019 / Accepted: 25 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Growth and Characterization in Nanowires)
PDF [2163 KB, uploaded 15 July 2019]


PEDOT nanowires (NWs) directly grown on the conducting electrode of quartz resonators enable an advanced electrogravimetric analysis of their charge storage behavior. Electrochemical quartz crystal microbalance (EQCM) and its coupling with electrochemical impedance spectroscopy (ac–electrogravimetry or AC–EG) were used complementarily and reveal that TBA+, BF4 and ACN participate in the charge compensation process with different kinetics and quantity. BF4 anions were dominant in terms of concentration over TBA+ cations and the anion transfer results in the exclusion of the solvent molecules. TBA+ concentration variation in the electrode was small compared to that of the BF4 counterpart. However, Mw of TBA+ is much higher than BF4 (242.3 vs. 86.6 g·mol−1). Thus, TBA+ cations’ gravimetric contribution to the EQCM response was more significant than that of BF4. Additional contribution of ACN with an opposite flux direction compared with BF4, led to a net mass gain/lost during a negative/positive potential scan, masking partially the anion response. Such subtleties of the interfacial ion transfer processes were disentangled due to the complementarity of the EQCM and AC–EG methodologies, which were applied here for the characterization of electrochemical processes at the PEDOT NW electrode/organic electrolyte interface. View Full-Text
Keywords: PEDOT; nanowires; (pseudo)-supercapacitors; charge storage mechanism; interfacial ion transfer; EQCM; AC–EG PEDOT; nanowires; (pseudo)-supercapacitors; charge storage mechanism; interfacial ion transfer; EQCM; AC–EG

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Lé, T.; Aradilla, D.; Bidan, G.; Billon, F.; Debiemme-Chouvy, C.; Perrot, H.; Sel, O. Charge Storage Properties of Nanostructured Poly (3,4–ethylenedioxythiophene) Electrodes Revealed by Advanced Electrogravimetry. Nanomaterials 2019, 9, 962.

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