Mechanistic aspects of glycerol oxidation on palladium electrocatalysts in model aqueous and fermentation media solutions

• Published in: Electrochimica acta 2024-09, Vol.497, p.144479, Article 144479
• Main Authors: Silina, Y.E., Butyrskaya, E.V., Koch, M., Fink-Straube, C., Korkmaz, N., Levchenko, M.G., Zolotukhina, E.V.
• Format: Article
• Language: English
• Subjects: Adsorption; Fermentation solutions; Glycerol electrooxidation; Hydroxyls; Oxygen; Palladium
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2024.144479

•For glycerol electrooxidation the anodic limit of Pd-electrodes is superior to their ECSA.•The adsorption of glycerol appears to be not a dominant factor in its total electrooxidation route.•Role of molecular oxygen in electrooxidation of glycerol on Pd-modified electrodes was revealed.•The larger Pd-particles better catalyze glycerol oxidation. Herein, a study dealing with a progress on palladium (Pd) electrocatalysts for an efficient glycerol electrooxidation in model aqueous and real fermentation solutions with special focus on some physicochemical parameters (e.g., the impact of adsorption stage of multiple species, presence of oxygen, influence of anodic limits and Pd-size) was conducted. During the course of investigations by tandem of an optical oxygen minisensor and cyclic voltammetry a significant impact of oxygen on the efficiency of glycerol electrooxidation on Pd electrocatalysts at alkaline pH in model aqueous and yeast fermentation media was revealed. The obtained knowledge was used for the optimization of an assay utilizing Pd-sensing layers for glycerol determination and quantification in yeast fermentation medium. Received results showed a satisfactory agreement with a control measurement carried out by gas chromatography mass-spectrometry. [Display omitted]