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Stress-charge coupling coefficient for thin-film polypyrrole actuators – Investigation of capacitive ion exchange in the oxidized state
Citation Link: https://doi.org/10.15480/882.2307
Publikationstyp
Journal Article
Date Issued
2019-06-03
Sprache
English
Author(s)
TORE-DOI
TORE-URI
Journal
Volume
318
Start Page
504
End Page
512
Citation
Electrochimica Acta (318): 504-512 (2019)
Publisher DOI
Scopus ID
Publisher
Elsevier
This work quantifies the actuation behavior of thin electrodeposited polypyrrole films on rigid substrates. During in situ cantilever bending experiments in aqueous perchloric acid, the films remain clamped to their substrate and the film stress is inferred from a small bending of the cantilever. The potential range under study is 0.4–0.8 V versus the standard hydrogen electrode. Within this potential region, the film is in the oxidized state and the actuation arises from capacitive electrode processes. For the volumetric capacitance, c*, we find 0.24±0.01F/mm3. The stress-charge coupling coefficient, ξ, which is defined as the stress variation per volumetric charge density, emerges as −153±11mV. The results are robust, reproducible and independent of the film thickness or the potential scan rate. The experimental value of ξ is supported by an independent estimate, based on a micromechanical model in combination with literature data for the partial molar volume of solvated perchlorate anions and the elastic constants of polypyrrole.
Subjects
Polypyrrole
Actuation
Stress-charge coupling
Strain-charge coupling
Plane stress
DDC Class
600: Technik
More Funding Information
This work was supported by the German Research Foundation (DFG) via SFB 986 M 3 , project B2.
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