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Synthesis and characterization of binary and ternary platinum alloy catalysts for direct methanol fuel cell application
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Direct Methanol Fuel Cell using a proton exchange membrane has been considered as suitable power source for portable applications. As catalyst in the membrane electrode assemblies Pt alloys, mostly PtRu, has to be used due to the CO poisoning of the Pt surface in the course of the methanol oxidation. To investigate and improve the performance of the methanol oxidation a preparation technique was used for preparing catalyst layers in Polymer Electrolyte Membrane Fuel Cells. This method enables a selective electrochemical deposition of platinum and other metal nanoparticles within the three-phase boundary region. Model electrodes consisting of sprayed precursor layers of powdered carbon and Nafion solution, supported on a glassy-carbon disk were used for the experiments. The catalyst salts were electrodeposited onto the glassy-carbon using a direct constant current. The volume-weighted average crystal size of the noble metal nanoparticles and their composition were determined by X-ray diffraction measurements. The electrochemical activity of the deposited catalyst material was investigated by cyclic voltammetry, analysing the methanol oxidation peak. Further information about the content and concentration of the different binary and ternary alloys studied was obtained by EDX analysis, after the electrodeposition.

Place, publisher, year, edition, pages
2002.
Keyword [en]
Technology, Fuel cell, Direct Methanol Fuel Cell, CO poisoning, OH-groups, Electro-deposition, PtRu alloys, Binary Alloys, Ternary Alloys, X-ray diffraction, Cyclic Voltammetry
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-44559ISRN: LTU-EX--02/265--SELocal ID: 258c3829-8a64-4de2-ab73-a53ad09c1c5dOAI: oai:DiVA.org:ltu-44559DiVA: diva2:1017838
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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