Modification of carbon supported catalysts to improve performance in gas diffusion electrodes

被引：92

作者：

Jia, NY ^{[1
]}

Martin, RB ^{[1
]}

Qi, ZG ^{[1
]}

Lefebvre, MC ^{[1
]}

Pickup, PG ^{[1
]}

机构：

[1] Mem Univ Newfoundland, Dept Chem, St Johns, NF A1B 3X7, Canada

来源：

ELECTROCHIMICA ACTA | 2001年 / 46卷 / 18期

基金：

加拿大自然科学与工程研究理事会;

关键词：

surface oxidation; carbon supported catalysts; gas diffusion electrodes;

D O I：

10.1016/S0013-4686(01)00511-4

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The effect of surface oxidation of the carbon support of Pt catalysts with nitric acid has been investigated. Oxidation of the support before deposition of the Pt leads to a decrease in the Pt particle size, as reported by others, and enhanced performance for oxygen reduction in gas diffusion electrodes. Oxidation of the support after Pt deposition produces an even greater enhancement in performance, which we have attributed to enhanced proton conductivity in the catalyst layer. It is speculated that hydrophilic carboxylic acid groups produced by surface oxidation enhance wetting of the catalyst layer. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：2863 / 2869

页数：7

共 27 条

[1]

[Anonymous], [No title captured]

[2]

ANTONUCCI PL, 1994, J APPL ELECTROCHEM, V24, P58

[3] Recent developments and applications of the polymer fuel cell - Discussion [J].

Twidell, J ;

Appleby, AJ .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1996, 354 (1712) :1693-1693

[4]

COLBOW KM, 2000, Patent No. 6153323

[5]

De Levie R, 1967, ADV ELECTROCHEMISTRY, V6, P329

[6] O2 reduction on an ink-type rotating disk electrode using Pt supported on high-area carbons [J].

Gojkovic, SL ;

Zecevic, SK ;

Savinell, RF .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (11) :3713-3720

[7]

JIA N, 1999, THESIS MEM U NEWF ST

[8] Effects of Nafion impregnation on performances of PEMFC electrodes [J].

Lee, SJ ;

Mukerjee, S ;

McBreen, J ;

Rho, YW ;

Kho, YT ;

Lee, TH .

ELECTROCHIMICA ACTA, 1998, 43 (24) :3693-3701

[9] Characterization of ionic conductivity profiles within proton exchange membrane fuel cell gas diffusion electrodes by impedance spectroscopy [J].

Lefebvre, MC ;

Martin, RB ;

Pickup, PG .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 1999, 2 (06) :259-261

[10] Improvement in the diffusion characteristics of low Pt-loaded electrodes for PEFCs [J].

Lufrano, F ;

Passalacqua, E ;

Squadrito, G ;

Patti, A ;

Giorgi, L .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1999, 29 (04) :445-448

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