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

Steimecke M, Carthäuser J, Fiedler L, Dieterich E, Bron M (2024)

Publication Type: Journal article

Publication year: 2024

Journal

ChemElectroChem Wiley

DOI: 10.1002/celc.202400158

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.

Involved external institutions

Martin-Luther-Universität Halle-Wittenberg (MLU) DE Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Steimecke, M., Carthäuser, J., Fiedler, L., Dieterich, E., & Bron, M. (2024). Probing Carbon Materials Towards the Vanadium(IV)/(V) Reaction by Scanning Electrochemical Microscopy. ChemElectroChem. https://doi.org/10.1002/celc.202400158

MLA:

Steimecke, Matthias, et al. "Probing Carbon Materials Towards the Vanadium(IV)/(V) Reaction by Scanning Electrochemical Microscopy." ChemElectroChem (2024).

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