2008 | OriginalPaper | Buchkapitel
Spray-based and CVD Processes for Synthesis of Fuel Cell Catalysts and Thin Catalyst Layers
verfasst von : Radenka Maric
Erschienen in: PEM Fuel Cell Electrocatalysts and Catalyst Layers
Verlag: Springer London
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In spite of many efforts and improvements by thousands of scientists worldwide, PEMFCs and DMFCs have not been commercially used. State-of-the-art electrocatalysts for PEMFCs rely on large quantities of platinum to achieve acceptable performance levels. This presents a significant hurdle to market acceptance of FC-powered vehicles; a commercially viable electrocatalyst will require nearly an order-of-magnitude reduction in Pt usage to meet both cost and Pt availability constraints. Pt fine particles are dispersed on carbon blacks with a large surface area to reduce the total Pt used and to enhance catalytic activity. This activity depends not only on the primary structure of the catalyst Pt/carbon composites (i.e., carbon surface area, Pt particle size, Pt surface area, etc.), but also on the secondary structure (i.e., aggregation and agglomeration of carbon grains).