CNT- based cathode material for DMFC

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CNT- based cathode material for DMFC
Autor B. Rohland, Mihaela-C. Bunescu, Marlies Pietrzak, Marion Wienecke, T. Barfels, S. Möller
In: Fullerenes, Nanotubes and Carbon Nanostructures
Ausgabe 13
ISBN/ISSN:
Erscheinungsjahr 2005
Jahrgang
Seitenzahl 511-522
Hyperlink http://www.tandfonline.com/doi/abs/10.1081/FST-200039478#.VCk2Vhb9oZ8
Review anderes

New cathode material for Direct Methanol Fuel Cells (DMFC) based on multi‐wall carbon nanotubes (MWCNT), aiming to improving the power density of the cell was analysed. Commercially available MWCNTs were oxidized in a mixture of HNO3 and H2SO4. Pt catalyst was electroless deposited using a chloroplatinic acid solution, based on H2 (PtCl6)·6H2O. The morphology of the deposits was analysed by TEM and SEM. Uniformly distributed nano particles of Pt with diameters of approximately 5 nm along the MWCNTs surface, agglomerates of thick Pt deposits, as well as complete uncoated nanotubes were observed. An optimisation of the size and distribution of the Pt particles could be obtained by varying the process parameters (dispersion time and solution concentration). The MWCNTs+Pt were used to produced a paste, which was screen‐printed on Nafion foil. The membrane electrode assembly (MEA) was tested at 40°C with air and 3% methanol in water. The performances were improved as compared with the standard DMFC electrodes.