Electro-Oxidation of Ethylene Glycol on a Pt-Film Electrode Studied by Combined in Situ Infrared Spectroscopy and Online Mass Spectrometry

被引：49
作者：
Schnaidt, J. [1 ]
Heinen, M. [1 ]
Jusys, Z. [1 ]
Behm, R. J. [1 ]
机构：
[1] Univ Ulm, Inst Surface Chem & Catalysis, D-89069 Ulm, Germany
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 04期
关键词：
SINGLE-CRYSTAL ELECTRODES; TIME FTIR SPECTROSCOPY; ELECTROCATALYTIC OXIDATION; PLATINUM-ELECTRODES; ELECTROCHEMICAL OXIDATION; CO ADSORPTION; CARBON-MONOXIDE; ACID; ETHANOL; SURFACE;
D O I：
10.1021/jp208162q
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Adsorption and oxidation of ethylene glycol (EG) on a Pt thin film electrode was investigated in a combined spectro-electrochemical approach under continuous flow conditions, including potentiodynamic, potentiostatic, as well as adsorbate-stripping experiments. During the adsorption/electrooxidation of EG, the potential-dependent development of the EG adlayer was followed by highly surface sensitive, in situ attenuated total reflection Fourier transform infrared spectroscopy, while the volatile products were simultaneously monitored by online differential electrochemical mass spectrometry. For the assignment of the detected IR bands, comparative experiments following the adsorption/oxidation of the possible reaction intermediates/products (glycolaldehyde, glycolic acid, glyoxal, glyoxylic acid oxalic acid) were performed. The data show that (i) during the adsorption/oxidation of EG, COad is formed in the potential range between 0.1 and 0.7 V-RHE, which can be oxidized further to CO2 at potentials above 0.5 V. (ii) In addition to COad, adsorbed 2-hydroxyacetyl and glycolate were detected, where (iii) 2-hydroxyacetyl is a precursor to form adsorbed CO, and (iv) adsorbed glycolate exists in equilibrium with glycolic acid in solution.
引用
收藏
页码：2872 / 2883
页数：12
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