期刊
JOURNAL OF POWER SOURCES
卷 195, 期 2, 页码 638-648出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.08.005
关键词
PEM fuel cell; Oxygen reduction reaction; Pt-Rh carbon nitride electrocatalysts; CV-TF-RDE method; X-ray diffraction
资金
- Italian MURST
In this paper the preparation of a new bimetal electrocatalyst for the oxygen reduction reaction (ORR), which is one of the most important bottlenecks in the operation of polymer electrolyte membrane fuel cells (PEMFCs), is described. This material was synthesized through a pyrolysis process of a zeolitic inorganic-organic polymer electrolyte (Z-IOPE-like) precursor, followed by suitable washing and activation procedures of the product. The electrocatalyst, whose active sites consist of platinum and rhodium, was: (a) extensively characterized from the chemical, structural, morphological and electrochemical points of view and (b) used to prepare a membrane-electrode assembly (MEA) which was tested under operative conditions in a single-cell configuration. It was observed that, with respect to a reference material based on supported platinum, rhodium did not compromise the performance of the electrocatalyst in the ORR. This behaviour was interpreted in the framework of a general model concerning the enhancement of ORR performance in bimetal systems supported on carbon nitrides. Finally, the material shows a slightly better tolerance toward a few common contaminants for the ORR such as methanol and chloride anions, typical of direct methanol fuel cells (DMFCs) and vehicular applications, respectively. (C) 2009 Elsevier B. V. All rights reserved.
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