Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.3161
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.
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) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
Appears in Collections:Publications with fulltext

Files in This Item:
File Description SizeFormat
acs.langmuir.0c02068.pdfVerlags-PDF2,51 MBAdobe PDFView/Open
Thumbnail
Show full item record

Page view(s)

90
Last Week
1
Last month
10
checked on Jul 24, 2021

Download(s)

43
checked on Jul 24, 2021

Google ScholarTM

Check

Note about this record

Cite this record

Export

This item is licensed under a Creative Commons License Creative Commons