Abstract
The electro-oxidation of organic molecules at the anode with simultaneous generation of hydrogen at the cathode in electrosynthesis reactors is considered as a promising and efficient process for the co-production of hydrogen and bio-sourced value-added chemicals. In this study and for the first time, we investigated the electro-oxidation of glucose and methylglucoside in 0.1molL-1 NaOH on polycrystalline Pt (real surface area=14.5±0.5cm2, roughness≈5) in the potential range [0; +1.20V vs. rhe] under silent and ultrasonic (bath, 45kHz, Pacous=11.20W) conditions. A series of linear sweep voltammograms, chronoamperograms and high-performance liquid chronoamperograms were generated. It was found that higher current densities were obtained under ultrasonic conditions over the potential range of +0.25V to +1.10V vs. rhe, indicating that higher oxidation rates were provided under ultrasonication. It was observed that the desorption of species from the Pt surface in the medium potential region was favoured, allowing free catalytic Pt sites for further adsorption and oxidation of reactants; and in the high potential region, high peak current densities in the presence of ultrasound was due to enhanced mass transport of the electroactive species from the bulk electrolyte to the Pt-polycrystalline electrode surface. HPLC studies confirmed that higher electrochemical activity was obtained in the presence of ultrasound than in the absence. In our conditions, it was also found that low frequency ultrasound did not change the selectivity of the glucose and methylglucoside electro-oxidation reactions but instead, a significant increase in the rate of conversion was observed.
Highlights
Owing to its huge abundance [1], renewable carbon from lignocellulosic biomass represents the best alternative for the future to fossil resources for both energy applications and platform chemicals for fine chemistry [2]
The oxidation products of glucose derivatives into carboxylic acids lead to the formation of important family of chemicals that can be used in various applications ranging from cosmetic and detergents to bio-sourced polymers [7]
A complete CV of the background electrolyte (0.1 mol L−1 NaOH) was recorded on Pt-poly electrode in order to determine the real surface area (Ar) of the electrode, whereas linear sweep voltammetry (LSV) were recorded in supporting electrolyte in presence of glucose and methylglucoside in order to check the electroreactivity of molecules
Summary
Owing to its huge abundance [1], renewable carbon from lignocellulosic biomass represents the best alternative for the future to fossil resources for both energy applications and platform chemicals for fine chemistry [2]. The oxidation products of glucose derivatives into carboxylic acids lead to the formation of important family of chemicals that can be used in various applications ranging from cosmetic and detergents (surfactants) to bio-sourced polymers [7]. The electrooxidation of organic molecules at the anode of an electrosynthesis reactor occurs simultaneously with the production of hydrogen, which is considered as the most promising energy carrier for the future through its use in fuel cells, according to the following equation in the case of the electrochemical oxidation of glucose into gluconic acid: C6H12O6 + H2O → C6H12O7 + H2
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