Mechanism of Electrochemical L‐Cysteine Oxidation on Pt

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.

Long Shelf‐Life Efficient Electrolytes Based on Trace l‐Cysteine Additives toward Stable Zinc Metal Anodes

“…According to the prior studies, the alkanethiol groups in Cys structure exhibit a high redox activity during the electrochemical oxidation process, which echoes with the previous CV analysis of Zn|Ti half cells. [25,29] To exclude the influence of deposition substrates, Cu foils were also adopted as cathodes to recorded CV curves at a scan rate of 1 mV s −1 (Figure S10, Supporting Information). Surprisingly, there is merely one oxidation peak detected in cells using ZnSO 4 electrolytes, while two oxidation peaks are observed in cells using Cys/ZnSO 4 electrolytes, which substantially demonstrates the Cys oxidation process.…”

“…[ 3a,24 ] Moreover, there are two peaks observed during the Zn stripping process, which might attribute to the oxidation process of Cys additives. [ 25 ] The detailed analysis will be discussed later in the following part. According to the previous work, the subsequent growth process can be characterized by the current evolution under a fixed potential.…”

l-Cysteine-Terminated Triangular Silver Nanoplates/MXene Nanosheets are Used as Electrochemical Biosensors for Efficiently Detecting 5-Hydroxytryptamine

“…First, TSC-terminated Tri-AgNP was prepared, but TSC can decrease the conductivity of Tri-AgNPs. l -Cys is an electrochemically active amino acid with a sulfhydryl group on its side chain . TSC in Tri-AgNP/TSC can be selectively replaced with thiol l -Cys to obtain Tri-AgNP/ l -Cys.…”