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Publisher DOI: 10.1016/j.electacta.2019.05.166
Title: Stress-charge coupling coefficient for thin-film polypyrrole actuators – Investigation of capacitive ion exchange in the oxidized state
Language: English
Authors: Roschning, Benedikt 
Weissmüller, Jörg 
Keywords: Polypyrrole;Actuation;Stress-charge coupling;Strain-charge coupling;Plane stress
Issue Date: 3-Jun-2019
Publisher: Elsevier
Source: Electrochimica Acta (318): 504-512 (2019)
Journal: Electrochimica acta 
Abstract (english): 
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.
DOI: 10.15480/882.2307
ISSN: 0013-4686
Institute: Werkstoffphysik und -technologie M-22 
Document Type: Article
More Funding information: This work was supported by the German Research Foundation (DFG) via SFB 986 M 3 , project B2.
Project: SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
SFB 986, Teilproject B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen 
License: CC BY-ND 4.0 (Attribution-NoDerivatives) CC BY-ND 4.0 (Attribution-NoDerivatives)
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