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Probing Carbon Materials Towards the Vanadium(IV)/(V) Reaction by Scanning Electrochemical Microscopy.

Authors :
Steimecke, Matthias
Carthäuser, Jens
Fiedler, Lena
Dieterich, Emil
Bron, Michael
Source :
ChemElectroChem; 6/17/2024, Vol. 11 Issue 12, p1-7, 7p
Publication Year :
2024

Abstract

A method is presented to quantitatively analyze the reduction of vanadium(V) to vanadium(IV) over two flat carbon substrates (glassy carbon and graphite foil) using the feedback mode of scanning electrochemical microscopy. A pulse profile is validated and applied during approach curve experiments of a 10 μm Pt microelectrode. By fitting the approach curve data, electron transfer constants are calculated for various potentials and k0 is extracted from the corresponding Tafel plot. Furthermore, surface functional groups were introduced to the carbon substrates by acid treatment; however, kinetic parameters of the sluggish reduction reaction were only influenced to a minor extent. Finally, the same approach, combined with in situ‐Raman microscopy, is applied to a single graphene layer using a 2.7 μm Pt microelectrode. In this case, increased activity for both, the vanadium(V) reduction and vanadium(IV) oxidation reaction, was found close to the graphene edge sites by means of electrochemical microscopy for the first time. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21960216
Volume :
11
Issue :
12
Database :
Complementary Index
Journal :
ChemElectroChem
Publication Type :
Academic Journal
Accession number :
177945755
Full Text :
https://doi.org/10.1002/celc.202400158