On the Influence of Sulphur on the Pyrolysis Process of FeTMPP-Cl-based Electro-Catalysts with Respect to Oxygen Reduction Reaction (ORR) in Acidic Media

被引：35

作者：

Kramm , U. I. ^{[1
]}

Herrmann, I. ^{[1
]}

Fiechter, S. ^{[1
]}

Zehl, G. ^{[1
]}

Zizak, I. ^{[2
]}

Abs-Wurmbach, I.

Radnik, J. ^{[3
,4
]}

Dorbandt, I. ^{[1
]}

Bogdanoff, P. ^{[1
]}

机构：

[1] Helmholtz Zentrum Berlin Mat & Energie, Lise Meitner Campus,Glienicker Str 100, D-14109 Berlin, Germany

[2] Helmholtz Zentrum Berlin Mat & Energie, BESSYII, D-12489 Berlin, Germany

[3] Tech Univ Berlin, Fac VI, Berlin, Germany

[4] Univ Rostock, Leibniz Inst Catalysis, D-18055 Rostock, Germany

来源：

PROTON EXCHANGE MEMBRANE FUEL CELLS 9 | 2009年 / 25卷 / 01期

关键词：

HIGH-AREA CARBON; PEM FUEL-CELLS; THERMAL-DECOMPOSITION; ELECTROCATALYSTS; IRON; STABILITY; CHLORIDE; COTMPP;

D O I：

10.1149/1.3210617

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Pyrolysis of chloroiron-tetramethoxyphenyl-porphyrin (FeTMPP-Cl) in the presence of iron oxalate (+/- sulphur) leads to the formation of higly porous and active catalysts for the oxygen reduction reaction (ORR). In order to clarify the influence of sulphur the pyrolysis process is analyzed by thermogravimetry (TG) and by high-temperature X-ray diffraction (HT-XRD). In the absence of sulphur iron carbide (FexC) is formed which catalyses the proceeding graphitisation of the pyrolysis products. As a result catalytic active centres are decomposed by this reaction. This can be avoided by the addition of sulphur because iron monosulphide (FeS; troilite) is formed instead of FexC. Furthermore, FeS can easily be removed in a successive etching step so that nearly all inactive by-products can be removed. The results are in accordance with the higher electrochemical performance of the sulphur containing catalysts.

引用

页码：659 / 670

页数：12

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