Spectroscopic Studies of the Glycerol Electro-Oxidation on Polycrystalline Au and Pt Surfaces in Acidic and Alkaline Media
Spectroscopic Studies of the Glycerol Electro-Oxidation on Polycrystalline Au and Pt Surfaces in Acidic and Alkaline Media
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DOI：
10.1007/s12678-011-0039-0
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发表时间：
2011-06-01
期刊：
影响因子：
3.1
通讯作者：
Tremiliosi-Filho, Germano
中科院分区：
文献类型：
--
作者：
Gomes, Janaina Fernandes;Tremiliosi-Filho, Germano
研究了甘油在Au和Pt电极上的电氧化反应。通过原位傅里叶变换红外（FTIR）光谱法测定了反应中间体和形成的产物。将实验测得的Au和Pt在酸性和碱性介质中的FTIR光谱与标准光谱进行了比较，以鉴定氧化产物。对于Au，氧化反应高度依赖于溶液pH。在碱性介质中，形成二羟基丙酮，丙醇二酸，中草酸，乙醛酸，和二氧化碳，而在酸性介质中形成丙醇二酸，甲酸，和二氧化碳。然而，甘油在Pt上的氧化导致形成丙醇二酸、乙醇酸、乙醛酸、甲酸和二氧化碳，与溶液pH无关。对于两种电极材料Pt和Au，检测到二氧化碳，表明可能的C-C-C键断裂。显然，甘油氧化途径可以通过电极材料和溶液pH的性质来控制。此外，甘油是一种典型的化合物，当供给燃料电池时，其具有产生电力的潜力，同时伴随形成许多具有商业利益的化学品。
The electro-oxidation of glycerol on Au and Pt was studied in acid and alkaline media. The reaction intermediates and products formed were determined by in situ Fourier transform infrared (FTIR) spectroscopy. The experimental FTIR spectra measured on Au and Pt in acid and alkaline media were compared with the standard ones for the identification of the oxidation products. For Au, the oxidation reaction is highly dependent on the solution pH. In alkaline medium, dihydroxyacetone, tartronic acid, mesoxalic acid, glyoxylic acid, and carbon dioxide are formed while in acidic medium tartronic acid, formic acid, and carbon dioxide are formed. However, the oxidation of glycerol on Pt leads to the formation of tartronic acid, glycolic acid, glyoxylic acid, formic acid, and carbon dioxide, independent of the solution pH. For both electrode materials, Pt and Au, carbon dioxide is detected indicating the possible breaking of the C-C-C bonds. Clearly, the glycerol oxidation pathways can be controlled by the nature of the electrode material and solution pH. Furthermore, glycerol is a typical compound that has potentiality to produce electricity when feed a fuel cell while many chemicals with commercial interest are concomitantly formed.