CO and CO/H2 electrooxidation on carbon supported Pt-Ru catalyst in phosphotungstic acid (H3PW12O40) electrolyte

被引：27

作者：

Aricò, AS ^{[1
]}

Modica, E ^{[1
]}

Ferrara, I ^{[1
]}

Antonucci, V ^{[1
]}

机构：

[1] CNR, Inst Transformat & Storage Energy, I-98126 Messina, Italy

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 1998年 / 28卷 / 09期

关键词：

CO electrooxidation; Pt-Ru catalyst; phosphotungstic acid; reaction orders; activation energy; Tafel slopes;

D O I：

10.1023/A:1003456119509

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

An electrode-kinetic study of the oxidation of CO and CO/H-2 mixtures on a Pt-Ru/C catalyst was carried out in phosphotungstic acid (PWA) electrolyte. The influence of temperature, CO partial pressure and proton concentration on the electrochemical oxidation rate was investigated, An apparent activation energy of about 50 kJ mol(-1) was found for CO oxidation at 0.6 V vs NHE. Fractional reaction orders close to 0.5 and -0.4 with respect to carbon monoxide and proton concentration, respectively, were observed, Tafel slopes were close to 136 mV dec(-1) at 70 degrees C for both CO and CO/H-2 oxidation. The PWA electrolyte appeared to promote the methanol electrooxidation by increasing the rate of water discharge at the electrode.

引用

页码：881 / 887

页数：7

共 37 条

[1] IN-SITU STRUCTURAL CHARACTERIZATION OF A PLATINUM ELECTROCATALYST BY DISPERSIVE-X-RAY ABSORPTION-SPECTROSCOPY [J].

ALLEN, PG ;

CONRADSON, SD ;

WILSON, MS ;

GOTTESFELD, S ;

RAISTRICK, ID ;

VALERIO, J ;

LOVATO, M .

ELECTROCHIMICA ACTA, 1994, 39 (16) :2415-2418

[2] DIGITAL-SIMULATION OF GALVANOSTATIC CURRENT POTENTIAL DATA FOR GAS-DIFFUSION ELECTRODES AND ESTIMATION OF ELECTRODE-KINETIC PARAMETERS [J].

ARICO, AS ;

SHUKLA, AK ;

ANTONUCCI, V ;

GIORDANO, N .

JOURNAL OF POWER SOURCES, 1994, 50 (1-2) :177-186

[3] METHANOL OXIDATION ON CARBON-SUPPORTED PT-SN ELECTRODES IN SILICOTUNGSTIC ACID [J].

ARICO, AS ;

KIM, H ;

SHUKLA, AK ;

RAVIKUMAR, MK ;

ANTONUCCI, V ;

GIORDANO, N .

ELECTROCHIMICA ACTA, 1994, 39 (05) :691-700

[4] Analysis of the electrochemical characteristics of a direct methanol fuel cell based on a Pt-Ru/C anode catalyst [J].

Arico, AS ;

Creti, P ;

Kim, H ;

Mantegna, R ;

Giordano, N ;

Antonucci, V .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (12) :3950-3959

[5] Carbon monoxide electrooxidation on porous Pt-Ru electrodes in sulphuric acid [J].

Arico, AS ;

Modica, E ;

Passalacqua, E ;

Antonucci, V ;

Antonucci, PL .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1997, 27 (11) :1275-1282

[6] A.C.-IMPEDANCE SPECTROSCOPY STUDY OF OXYGEN REDUCTION AT NAFION(R) COATED GAS-DIFFUSION ELECTRODES IN SULFURIC-ACID - TEFLON LOADING AND METHANOL CROSS-OVER EFFECTS [J].

ARICO, AS ;

ANTONUCCI, V ;

ALDERUCCI, V ;

MODICA, E ;

GIORDANO, N .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1993, 23 (11) :1107-1116

[7] MECHANISM OF ELECTRO-OXIDATION OF METHANOL ON PLATINUM ELECTRODE [J].

BAGOTZKY, VS ;

VASSILYEW, YB .

ELECTROCHIMICA ACTA, 1967, 12 (09) :1323-+

[8] THE ELECTROOXIDATION OF CO - A TEST REACTION IN ELECTROCATALYSIS [J].

BEDEN, B ;

LAMY, C ;

DETACCONI, NR ;

ARVIA, AJ .

ELECTROCHIMICA ACTA, 1990, 35 (04) :691-704

[9] INFLUENCE OF CHEMISORBED CARBON-MONOXIDE ON OXIDATION OF MOLECULAR-HYDROGEN AT SMOOTH PLATINUM IN SULFURIC-ACID SOLUTION [J].

BREITER, MW .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1975, 65 (02) :623-634

[10] NATURE OF CO ADSORPTION DURING H-2 OXIDATION IN RELATION TO MODELING FOR CO POISONING OF A FUEL-CELL ANODE [J].

DHAR, HP ;

CHRISTNER, LG ;

KUSH, AK .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1987, 134 (12) :3021-3026

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