Analyzing Structural Changes of Fe-N-C Cathode Catalysts in PEM Fuel Cell by Mossbauer Spectroscopy of Complete Membrane Electrode Assemblies

被引：88

作者：

Kramm, Ulrike I. ^{[1
]}

Lefevre, Michel ^{[2
]}

Bogdanoff, Peter ^{[3
]}

Schmeisser, Dieter ^{[1
]}

Dodelet, Jean-Pol ^{[4
]}

机构：

[1] Brandenburg Tech Univ Cottbus Senftenberg, Chair Appl Phys & Sensors, D-03046 Cottbus, Germany

[2] Canet Electrocatalysis Inc, Varennes, PQ J3X 1S2, Canada

[3] Helmholtz Ctr Berlin Mat & Energy, D-14109 Berlin, Germany

[4] INRS Energie, Mat & Telecommun, Varennes, PQ J3X 1S2, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 21期

基金：

加拿大自然科学与工程研究理事会;

关键词：

OXYGEN REDUCTION REACTION; FE/N/C-CATALYSTS; IRON; CARBON; ELECTROCATALYSTS; DENSITY; SITES; POLYANILINE; ORR;

D O I：

10.1021/jz501955g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The applicability of analyzing by MoBbauer spectroscopy the structural changes of Fe-N-C catalysts that have been tested at the cathode of membrane electrode assemblies in proton exchange membrane (PEM) fuel cells is demonstrated. The MoBbauer characterization of powders of the same catalysts was recently described in our previous publication. A possible change of the iron species upon testing in fuel cell was investigated here by MoBbauer spectroscopy, energy-dispersive X-ray cross-sectional imaging, and neutron activation analysis. Our results show that the absorption probability of gamma rays by the iron nuclei in Fe-N-C is strongly affected by the presence of Nafion and water content. A detailed investigation of the effect of an oxidizing treatment (1.2 V) of the non-noble cathode in PEM fuel cell indicates that the observed activity decay is mainly attributable to carbon oxidation causing a leaching of active iron sites hosted in the carbon matrix.

引用

页码：3750 / 3756

页数：7

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