On the electrocatalysis of ethylene glycol oxidation

• Published in: Electrochimica acta Vol. 49; no. 1; pp. 85 - 91
• Main Authors: de Lima, R.B., Paganin, V., Iwasita, T., Vielstich, W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 30.12.2003; Elsevier
• Subjects: Applied sciences; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Ethylene glycol; Exact sciences and technology; Fuel cells; In situ FTIR; PtRu catalysts; Reaction pathways; Ethylene glycol; Reaction pathways; PtRu catalysts; Fuel cells; In situ FTIR; Infrared spectrometry; Electrocatalysis; Energetic efficiency; Oxidative degradation; Proton exchange membrane fuel cells; Supported catalyst
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2003.05.004

In the present paper, PtRu electrodes are used to study the electrooxidation of ethylene glycol (EG) in acid medium. The voltammetric results show that current–potential curves are shifted by about 0.2 V towards more negative potentials through the promoting effect of Ru on Pt. As in the case of pure platinum, FTIR spectra on PtRu surfaces prove that CO 2, glycolic acid and, possibly, oxalic acid are formed in parallel reactions. The catalytic activity, measured as the current density at constant potential, increases with the Ru content. But the complete oxidation of EG to CO 2 is favored by a high Pt content. In order to compare the catalytic activity of different PtRu compositions, currents measured at electrodeposited electrodes are normalized using the data for the oxidation of a CO monolayer. Results of a test using a laboratory PEM EG/O 2 cell with Pt:Ru (50:50) are presented.