期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 23, 期 -, 页码 122-124出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.07.020
关键词
Direct methanol fuel cells; Electrocatalysis; Protic ionic liquid
资金
- Engineering and Physical Sciences Research Council
- University of Nottingham
- EPSRC [EP/J016314/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J016314/1, EP/J501499/1] Funding Source: researchfish
Oxidation of H2O, CO and CH3OH was investigated at Pt as a function of temperature in the protic ionic liquid diethylmethylammonium trifluoromethanesulfonate. Trace H2O oxidation in the ionic liquid results in coverage of the Pt with adsorbed oxides. Increasing the temperature significantly reduces the potential at which this reaction occurs. CH3OH and CO oxidation kinetics increased significantly with increasing temperature and oxidation of each species coincided with coverage of the Pt surface by the oxide. These observations indicate that surface oxides are required for complete oxidation of CH3OH to CO2 in the protic ionic liquid, in a similar way to that observed in conventional aqueous electrolytes. While the overpotential for CH3OH oxidation was drastically higher than that observed in purely aqueous electrolytes, it decreased with increasing water content of the ionic liquid. The results described here have implications for the development of protic ionic liquid electrolyte fuel cells and these implications are discussed. (C) 2012 Elsevier B.V. All rights reserved.
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