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Publisher DOI: 10.1021/acs.langmuir.0c02068
Title: Probing the electrolyte transfer in ultrathin polypyrrole films by In situ X-ray reflectivity and electrochemistry
Language: English
Authors: Lakner, Pirmin H. 
Brinker, Manuel 
Seitz, Christoph 
Jacobse, Leon 
Vonk, Vedran 
Lippmann, Milena 
Volkov, S. A. 
Huber, Patrick  
Keller, Thomas F. 
Issue Date: 17-Nov-2020
Source: Langmuir : the ACS journal of surfaces and colloids 45 (36): 13448-13456 (2020-11-17)
Journal: Langmuir : the ACS journal of surfaces and colloids 
Abstract (english): 
This study reports on the potential-induced charge and mass transfer between an ultrathin polypyrrole (PPy) film and an electrolyte by simultaneous in situ X-ray reflectivity (XRR) and electrochemistry (EC) utilizing their sensitivity to electrons. An about 30 nm thin PPy film was deposited on a silicon single crystal by fast potential cycling, providing a dense film of an extraordinary small surface roughness. XRR was recorded from the PPy film in an aqueous 0.1 M perchloric acid at electric potentials between -0.2 V and +0.5 V vs Ag/AgCl. The PPy film shows typical reversible and linear changes in film thickness and electron density arising from the potential-dependent electrolyte incorporation. By introducing EC-XRR, a comprehensive analysis combining in situ XRR and EC, the net number of electrons passing through the PPy-electrolyte interface was deduced along with the potential-induced thickness variations, indicating a complex exchange mechanism. Evidently, along with the anion transfer, parallel charge compensation by protons and a volume and electron compensating counterflow of solvent molecules take place. Complementary time-dependent EC-XRR scans indicate that these exchange mechanisms are individual in two potential ranges. The low actuation along with a high pseudocapacitance suggest the fast potentiodynamically deposited PPy film as a promising supercapacitor material.
DOI: 10.15480/882.3161
ISSN: 0743-7463
Institute: Werkstoffphysik und -technologie M-22 
Center for Integrated Multiscale Material Systems M-2 
Document Type: Article
Project: SFB 986: Teilprojekt B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen 
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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