Mechanism of Electrochemical L-Cysteine Oxidation on Pt

Author(s)

Dourado, Andre H. B. ^[1] ; Arenz, Matthias ^{[2, 3]} ; Cordoba de Torresi, I, Susana

Affiliation

^[1] I, Univ Sao Paulo, Inst Quim, Av Prof Lineu Prestes, BR-05508080 Sao Paulo, SP - Brazil

^[2] Kobenhavn Univ, Chem Dept, Univ Pk 5, DK-2100 Copenhagen - Denmark

^[3] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern - Switzerland

• Document type: Journal article
• Source: CHEMELECTROCHEM; v. 6, n. 4, p. 1009-1013, FEB 15 2019.
• Web of Science Citations: 0

Abstract

The electrochemical behavior of L-cysteine on Pt electrodes was studied by in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIRS) and online differential electrochemical mass spectrometry (DEMS). The ATR-FTIRS measurements allowed verification of the electrochemical mechanism of the oxidation of this molecule. The time resolution of the technique was crucial for relating each functional group to the faradaic current, suggesting electrochemical and chemical steps for the S atom oxidation. The DEMS experiments do not allow verification of desorbed intermediates due to their high solvation. Nevertheless, this technique was crucial for detecting side reactions, such as the decarboxylation of the adsorbed intermediates observed mainly under highly acidic conditions, in contrast to the conventional Kolbe mechanism. (AU)

• FAPESP's process: 15/08300-9 - Study of L-cysteine and L-cystine adsorption and oxidation on Pt electrode by internal reflection infrared spectroscopy and DEMS
• Grantee: André Henrique Baraldi Dourado
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 13/25592-8 - Study of L-cysteine and L-cystine adsorption on platinum electrodes
• Grantee: André Henrique Baraldi Dourado
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)