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  On the time resolution of electrochemical scanning flow cell coupled to downstream analysis

Shkirskiy, V., Speck, F. D., Kulyk, N., & Cherevko, S. (2019). On the time resolution of electrochemical scanning flow cell coupled to downstream analysis. Journal of the Electrochemical Society, 166(16), H866-H870. doi:10.1149/2.1401915jes.

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 Creators:
Shkirskiy, Viacheslav1, Author           
Speck, Florian D.2, 3, Author           
Kulyk, Nadiia4, Author           
Cherevko, Serhiy5, Author           
Affiliations:
1Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
2Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstr. 3, 91058, Erlangen, Germany, ou_persistent22              
3Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany, ou_persistent22              
4Dynamics of Complex Fluids and Interfaces, Helmholtz Institute Erlangen-Nürnberg (IEK-11) Forschungszentrum Jülich, Fürther Straße 248, 90429 Nürnberg, Germany, ou_persistent22              
5Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany, ou_persistent22              

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Free keywords: Catalysis; Cells; Cytology; Dissolution; Electrocatalysis; Electrochemistry; Inductively coupled plasma mass spectrometry; Plasma stability; Platinum, Cell geometries; Cu dissolutions; Different time scale; Electrochemical flow cells; Experimental conditions; Mechanistic studies; Outlet channels; Platinum dissolution, Residence time distribution
 Abstract: Many of the recent advancements in the electrocatalysis research have been obtained by application of coupled electrochemistry/massspectrometry techniques. Representative example is the electrochemical flow cells coupled to inductively coupled plasma mass spectrometry (on-line ICP-MS) in electrocatalysis stability research. In this technique, unambiguous correlation of the concentration of dissolved species vs. potential/current represents a significant challenge due to different time scales of electrochemical and concentration transients. In this work, we address this issue by investigating the time resolution of the scanning flow cell (SFC). For this, residence time distribution (RTD) is estimated using Cu dissolution experiments. Both experiments and numerical simulations show that RTD can be closely approximated by a bi-Gaussian distribution with asymmetry arising from the mass transport of species in the outlet channel. Studying the influence of cell geometry and experimental conditions on RTD, it is found that the length of the outlet tubes of SFC should be as short as possible. Moreover, an optimum flow rate and angle between inlet and outlet channels are defined. To demonstrate practical applicability of our findings, obtained RTD was used to deconvolute previously reported platinum dissolution transients during cycling voltammetry. Such data are of high importance in mechanistic studies of platinum dissolution. © 2019 The Electrochemical Society.

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Language(s): eng - English
 Dates: 2019-11-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1149/2.1401915jes
 Degree: -

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Title: Journal of the Electrochemical Society
  Abbreviation : J. Electrochem. Soc.
Source Genre: Journal
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Publ. Info: New York, NY, USA : Electrochemical Society
Pages: - Volume / Issue: 166 (16) Sequence Number: - Start / End Page: H866 - H870 Identifier: ISSN: 0013-4651
CoNE: https://pure.mpg.de/cone/journals/resource/991042748197686