ELECTROCHEMICAL OXIDATION OF ETHANOL ON PT(HKL) BASAL SURFACES IN NAOH AND NA2CO3 MEDIA

被引:24
作者
LOPEZATALAYA, M [1 ]
MORALLON, E [1 ]
CASES, F [1 ]
VAZQUEZ, JLK [1 ]
PEREZ, JM [1 ]
机构
[1] UNIV POLITECN VALENCIA,EUITI ALCOY,DEPT INGN TEXT,E-03800 ALCOY,SPAIN
关键词
ETHANOL; PLATINUM; ALKALINE MEDIA; ELECTRODES;
D O I
10.1016/0378-7753(94)01950-9
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
The electrooxidation of ethanol as well as its irreversible adsorption on platinum single crystal electrodes have been studied in NaOH and Na2CO3 media. Pt(100) and Pt(100) electrodes show deactivation for oxidation of bulk ethanol in both media, caused mainly by a structural surface modification of the electrode surface. However, in NaOH solution Pt(111) exhibits the best behaviour on ethanol oxidation showing the highest current density and the most stable surface. From the SNIFT-IR spectra adsorbed CO is the main poisoning species in the irreversible adsorption of ethanol on Pt(110) and Pt(100); on Pt(111) only a very weak band of adsorbed CO is observed. From the FT-IR spectra obtained during the oxidation of ethanol on Pt(110), Pt(100) and Pt(111) electrodes, acetate anions have been identified as the main soluble oxidation product.
引用
收藏
页码:109 / 117
页数:9
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