Journal Article

PUBDB-2020-04509

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Probing the Electrolyte Transfer in Ultrathin Polypyrrole Films by In Situ X-ray Reflectivity and Electrochemistry

Lakner, P.DESY* ; Brinker, M.Extern* ; Seitz, C.DESY* ; Jacobse, L.DESY* ; Vonk, V.DESY* ; Lippmann, M.DESY* ; Volkov, S.DESY* ; Huber, P.Extern* ; Keller, T. F. (Corresponding author)DESY*

2020
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.langmuir.0c02068  doi:10.3204/PUBDB-2020-04509

Abstract: This study reports on the potential-induced chargeand mass transfer between an ultrathin polypyrrole (PPy)film andan electrolyte by simultaneous in situ X-ray reflectivity (XRR) andelectrochemistry (EC) utilizing their sensitivity to electrons. Anabout 30 nm thin PPyfilm was deposited on a silicon single crystalby fast potential cycling, providing a densefilm of an extraordinarysmall surface roughness. XRR was recorded from the PPyfilm inan aqueous 0.1 M perchloric acid at electric potentials between−0.2 V and +0.5 V vs Ag/AgCl. The PPyfilm shows typicalreversible and linear changes infilm thickness and electron densityarising from the potential-dependent electrolyte incorporation. Byintroducing EC-XRR, a comprehensive analysis combining in situ XRR and EC, the net number of electrons passing through thePPy-electrolyte interface was deduced along with the potential-induced thickness variations, indicating a complex exchangemechanism. Evidently, along with the anion transfer, parallel charge compensation by protons and a volume and electroncompensating counterflow of solvent molecules take place. Complementary time-dependent EC-XRR scans indicate that theseexchange mechanisms are individual in two potential ranges. The low actuation along with a high pseudocapacitance suggest the fastpotentiodynamically deposited PPyfilm as a promising supercapacitor material.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. FS-Arbeitsgruppe (FS-TI)
3. Experimentebetreuung PETRA III (FS-PET-D)
4. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)
2. 6G3 - PETRA III (POF3-622) (POF3-622)
3. SFB 986 B07 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen (B07) (318019437) (318019437)

Experiment(s):

1. PETRA Beamline P08 (PETRA III)
2. DESY NanoLab: Microscopy

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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