|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.
Volkov, S. A.
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.
|URI:||http://hdl.handle.net/11420/8080||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)|
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