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  4. Mass Transport in Porous Electrodes Studied by Scanning Electrochemical Microscopy: Example of Nanoporous Gold
 
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Mass Transport in Porous Electrodes Studied by Scanning Electrochemical Microscopy: Example of Nanoporous Gold

Publikationstyp
Journal Article
Date Issued
2019-06-14
Sprache
English
Author(s)
Hänsch, Mareike  
Balboa, Luis  
Graf, Matthias  
Silva Olaya, Alex Ricardo  
Weissmüller, Jörg  
Wittstock, Gunther  
Institut
Werkstoffphysik und -technologie M-22  
TORE-URI
http://hdl.handle.net/11420/2940
Journal
ChemElectroChem  
Volume
6
Issue
12
Start Page
3160
End Page
3166
Citation
ChemElectroChem 12 (6): 3160-3166 (2019-06-14)
Publisher DOI
10.1002/celc.201900634
Scopus ID
2-s2.0-85068036022
Scanning electrochemical microscopy (SECM) approach curves were measured above different samples of nanoporous gold (NPG) using ascorbic acid as an irreversible redox mediator. Under these circumstances, the microelectrode current is informative in terms of the diffusive mass transport inside the network of pores in the sample, because mediator regeneration at NPG is not possible for an irreversible mediator. The reaction–transport problem was solved by finite element simulation for a wide variety of working distances, film thicknesses, and microelectrode geometries. The Bruggeman equation was used to relate transport properties and porosity. The simulation leads to an analytical expression that allows the determination of porosity values corrected by the tortuosity of insulating and conducting materials. The validity of the approach was demonstrated by applying it to NPG samples for which structural parameters can be varied by the particular dealloying protocol. This procedure is potentially applicable for following coarsening processes in porous electrodes and other materials, because the SECM procedure avoids emersion from electrolyte solution for those determinations.
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