Anodenkatalysatoren für PEM-Brennstoffzellen aus kolloidalen Vorstufen

The content of this work ist the synthesis and characterization of metal colloids. Further, the production of anode catalysts for PEM fuel cells by using this colloidal precursers and their characterization is content of this work, too. The XRD and XAS-measurements of the colloidal particles structure indicates a core-shell-structure for both, the Al-organic reduced and the borate-reduced PtRu particles. A conditioning apparatus was constructed, to prepare the catalysts from the colloidal precursors by thermal removal of the protecting shell. The colloid-catalysts, prepared via this route, exhibit a better long-time-stability in a real fuel cell setup than other catalysts. The comparison of bimetallic PtRu-catalysts with different mixed Pt- and Ru-particles, shows no differences in the CO-tolerance. By using the "surface organometallic chemistry" the preparation of Pt/Sn-oxide-catalysts is possible. This catalysts consists of Pt-metal particles with a surface modified by X-ray amorpheous Sn-oxide patches. By varying the Sn-precursor Pt3Sn-colloids can also be synthesized. The electrochemical comparison of the Pt/Sn-oxide-catalysts with the Pt3Sn-catalysts shows no differences between the systems. Catalysts with oxides other than Sn-oxide can be produced in a similar way. ix

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2004

Author dc:creator

• Mörtel, Reinhard

Contributors dc:contributor

• Bönnemann, Helmut

• info:eu-repo/classification/ddc/540
• Chemie
• Elektrokatalysatoren
• Anodenkatalysatoren
• PEM-Brennstoffzellen
• Wasserstoffoxidation
• Methanoloxidation
• CO-Toleranz
• Metallkolloid
• Oberflächenmodif

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123595%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:61994