Issue 28, 2019

Electrochemical oxidation of trivalent americium using a dipyrazinylpyridine modified ITO electrode

Abstract

We present here the electrochemical oxidation of Am(III) to AmVO2+ and AmVIO22+ in pH 1 nitric acid using a mesoporous tin-doped indium oxide electrode modified with a covalently attached dipyrazinylpyridine ligand. The applied potential affects the distribution of Am oxidation products. At potential 1.8 V, only Am(V) is observed, while increasing the potential to as much as 2.0 V, results in oxidation of Am(III) to Am(V) and subsequent oxidation of Am(V) to Am(VI). At applied potentials >2.0 V, Am(III) is oxidized to Am(V), while Am(VI) is reduced to Am(V). The latter reduction reaction is likely due to the increased rate of hydrogen peroxide formation from the 2-electron oxidation of water at the electrode at these high potentials. The development of future ligand modified electrodes for actinide oxidations must consider how they facilitate Am oxidations while disfavoring unwanted or competing reactions.

Graphical abstract: Electrochemical oxidation of trivalent americium using a dipyrazinylpyridine modified ITO electrode

Supplementary files

Article information

Article type
Communication
Submitted
29 Jan 2019
Accepted
11 Mar 2019
First published
12 Mar 2019

Chem. Commun., 2019,55, 4035-4038

Author version available

Electrochemical oxidation of trivalent americium using a dipyrazinylpyridine modified ITO electrode

M. J. Lopez, M. V. Sheridan, J. R. McLachlan, T. S. Grimes and C. J. Dares, Chem. Commun., 2019, 55, 4035 DOI: 10.1039/C9CC00837C

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