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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Reactivity of 3-carbon-atom chain alcohols on gold electrode: A comparison to understand the glycerol electro-oxidation
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Reactivity of 3-carbon-atom chain alcohols on gold electrode: A comparison to understand the glycerol electro-oxidation

机译：3-碳原子链醇对金电极的反应性：了解甘油电氧化的比较

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摘要

In this work, the electro-oxidation of glycerol was compared with those of similar 3-carbon-atom chain alcohols, namely 1-propanol, 2-propanol, propane-1,2-diol and propane-1,3-diol, in order to further understand the reactivity of glycerol on gold in alkaline environment. The corresponding products formation was monitored by in situ FTIR spectroscopy. The reactivity of the investigated alcohols on gold in alkaline medium decreased in the following order: glycerol > propane-1,2-diol propane-1,3-diol > 2-propanol approximate to 1-propanol. For glycerol and propane1,2-diol, the products distribution provided by in situ FTIR spectroscopy showed indications of high C-C bond breaking rates, as evidenced by the presence of products with 1 and 2 carbon-atom chain. On the other hand, the electrochemical oxidation of propane-1,3-diol, 2-propanol and 1-propanol led only to products with 3-carbon-atom chain. Based on these evidences, it was stated that the presence of vicinal OH groups in the alcohol molecule may be a key feature for the C-C bond breaking in alkaline medium, leading to the generation of further oxidized products that, in turns, yield more electrons per alcohol molecule and consequently higher current densities. Additionally, electrochemical measurements were also performed in acidic and neutral media for comparison. Under these conditions, the alcohols exhibited much lower current densities compared to those in alkaline medium. This was explained by the lack of alkoxide formation (active species in alkaline medium) and the blockage of the surface by ClO4- anions. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项工作中，甘油的电氧化用的那些类似的3-碳原子链的醇，即1-丙醇，2-丙醇，丙烷-1,2-二醇和丙烷-1,3-二醇的比较，在为了进一步了解碱性环境中甘油对黄金的反应性。通过原位FTIR光谱监测相应的产品形成。所研究的醇对碱性介质中的金的反应性在以下顺序下降：甘油>丙烷-1,2-二醇丙烷-1,3-二醇> 2-丙醇近似为1-丙醇。对于甘油和丙烷1,2-二醇，通过原位FTIR光谱提供的产物分布显示了高C-C键断裂速率的指示，如用1和2个碳原子链的存在所证明的。另一方面，丙烷-1,3-二醇，2-丙醇和1-丙醇的电化学氧化仅LED为具有3-碳原子链的产物。根据这些证据，据指出，邻位的OH基团的醇分子中存在可以是用于CC键在碱性介质中断裂的关键特征，从而导致进一步氧化产物的生成，在转动时，产生每更多的电子醇分子并因此更高的电流密度。另外，还在酸性和中性介质中进行电化学测量以进行比较。在这些条件下，与碱性培养基中的那些相比，醇表现出更低的电流密度。这是通过缺少醇盐形成（碱性介质中的活性物质）和表面通过CLO 4裂缝来解释。 （c）2016 Elsevier B.v.保留所有权利。

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