Electrochemical impedance studies of methanol electro-oxidation on Pt/C thin film electrode

被引：177

作者：

Hsing, IM ^{[1
]}

Wang, X ^{[1
]}

Leng, YJ ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Dept Chem Engn, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2002年 / 149卷 / 05期

关键词：

D O I：

10.1149/1.1467940

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Anodic processes of methanol oxidation on Pt/C thin film electrodes are carefully examined using electrochemical impedance spectroscopy. The influence of the electrode potential on the impedance pattern is studied and a quantitative explanation for the impedance behavior of methanol oxidation is achieved using a newly derived mathematical model. Theoretical derivations agree well with the experimental results, both of which show that the impedance patterns are strongly dependent on the electrode potential. At potentials higher than 0.30 V (vs. Ag/AgCl), a "pseudoinductive'' behavior is observed. At potentials higher than 0.42 V (vs. Ag/AgCl), the impedance pattern is reversed to the second and third quadrants. The conditions required for the reversing of impedance pattern are delineated with the use of the impedance model. (C) 2002 The Electrochemical Society.

引用

页码：A615 / A621

页数：7

共 32 条

[1] IMPEDANCE PLANE DISPLAY OF A REACTION WITH AN ADSORBED INTERMEDIATE [J].

ARMSTRONG, RD ;

HENDERSON, M .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1972, 39 (01) :81-+

[2] Analysis of reaction kinetics for carbon monoxide and carbon dioxide on polycrystalline platinum relative to fuel cell operation [J].

Bellows, RJ ;

MarucchiSoos, EP ;

Buckley, DT .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1996, 35 (04) :1235-1242

[3]

BINDER H, 1972, ELECTROCATALYSIS FUE, P43

[4] On the impedance plane displays for irreversible electrode reactions based on the stability conditions of the steady-state. I. One state variable besides electrode potential [J].

Cao, Chu-Nan .

Electrochimica Acta, 1990, 35 (05)

[5] ON THE IMPEDANCE PLANE DISPLAYS FOR IRREVERSIBLE ELECTRODE-REACTIONS BASED ON THE STABILITY CONDITIONS OF THE STEADY-STATE .2. 2 STATE VARIABLES BESIDES ELECTRODE POTENTIAL [J].

CAO, CN .

ELECTROCHIMICA ACTA, 1990, 35 (05) :837-844

[6] Electrochemical impedance study of electrode-membrane assemblies in PEM fuel cells I.: Electro-oxidation of H2 and H2/CO mixtures on Pt-based gas-diffusion electrodes [J].

Ciureanu, M ;

Wang, H .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1999, 146 (11) :4031-4040

[7] PEM fuel cells for transportation and stationary power generation applications [J].

Cleghorn, SJC ;

Ren, X ;

Springer, TE ;

Wilson, MS ;

Zawodzinski, C ;

Zawodzinski, TA ;

Gottesfeld, S .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 1997, 22 (12) :1137-1144

[8] METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RN ALLOYS [J].

GASTEIGER, HA ;

MARKOVIC, N ;

ROSS, PN ;

CAIRNS, EJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (46) :12020-12029

[9] Influence of the PTFE content in the diffusion layer of low-Pt loading electrodes for polymer electrolyte fuel cells [J].

Giorgi, L ;

Antolini, E ;

Pozio, A ;

Passalacqua, E .

ELECTROCHIMICA ACTA, 1998, 43 (24) :3675-3680

[10] Structural and electrochemical characterization of binary, ternary, and quaternary platinum alloy catalysts for methanol electro-oxidation [J].

Gurau, B ;

Viswanathan, R ;

Liu, RX ;

Lafrenz, TJ ;

Ley, KL ;

Smotkin, ES ;

Reddington, E ;

Sapienza, A ;

Chan, BC ;

Mallouk, TE ;

Sarangapani, S .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (49) :9997-10003

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