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 0.1 mol L-1 NaOH on polycrystalline Pt (real surface area = 14.5 ± 0.5 cm2, roughness ≈ 5) in the potential range [0; +1.20 V vs. rhe] under silent and ultrasonic (bath, 45 kHz, Pacous = 11.20 W) 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 +0.25 V to +1.10 V 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.

中文翻译：

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评估源自生物质的化合物的电化学和超声活化的有益组合。

在电合成反应器中，阳极处的有机分子发生电氧化，同时在阴极处产生氢，被认为是共同生产氢和生物来源的增值化学品的一种有前途的有效方法。在本研究中，并且是第一次，我们研究了在电位范围[0; 0]的多晶Pt（实际表面积= 14.5±0.5 cm2，粗糙度≈5）上，葡萄糖和甲基葡糖苷在0.1 mol L-1 NaOH中的电氧化。+1.20 V vs. rhe]在无声和超声（浴，45 kHz，Pacous = 11.20 W）条件下。生成了一系列线性扫描伏安图，计时电流图和高性能液体计时电流图。发现在超声条件下，相对于rhe，在+0.25 V至+1.10 V的电势范围内可获得更高的电流密度，表明在超声作用下提供了更高的氧化速率。观察到，在中电势区域中从Pt表面解吸物种是有利的，这允许自由的催化Pt部位进一步反应物的吸附和氧化。在高电势区域中，存在超声波时，峰值电流密度较高，这是由于电活性物质从块状电解质向Pt多晶电极表面的传质增强所致。HPLC研究证实，在超声存在下比在不存在超声下可获得更高的电化学活性。在我们的条件下，还发现低频超声不会改变葡萄糖和甲基葡糖苷电氧化反应的选择性，而是可以观察到转化率的显着提高。