Carbon monoxide electrooxidation on porous Pt-Ru electrodes in sulphuric acid

被引：25

作者：

Arico, AS ^{[1
]}

Modica, E ^{[1
]}

Passalacqua, E ^{[1
]}

Antonucci, V ^{[1
]}

Antonucci, PL ^{[1
]}

机构：

[1] UNIV REGGIO CALABRIA,FAC ENGN,INST CHEM,I-89100 REGGIO CALABRIA,ITALY

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 1997年 / 27卷 / 11期

关键词：

carbon monoxide; Pt-Ru/C catalyst; Tafel slopes; oxidation;

D O I：

10.1023/A:1018492122263

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

CO electrooxidation on a Pt-Ru/C catalyst was investigated in sulphuric acid electrolyte. The physico-chemical properties of the Pt-Ru/C catalyst were studied by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The influence of temperature, CO partial pressure and proton concentration on the electrochemical oxidation rate was investigated by steady-state galvanostatic polarization measurements. The apparent activation energy decreased from 70 to 30 kJ mol(-1) as the overpotential increased from 0.5 to 0.9 V vs NHE. The reaction order with respect to carbon monoxide increased, passing from 0.4 to 1, with the increase of the overpotential from 0.5 to 0.7 V vs NHE; a reaction order close to -1 with respect to the protonic concentration was observed, irrespective of the potential. Tafel slopes of about 136 mV dec(-1) were determined for oxidation of CO and CO/N-2 mixtures.

引用

页码：1275 / 1282

页数：8

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