Degradation of Carbon-Supported Pt Bimetallic Nanoparticles by Surface Segregation

Surface segregation of the non-noble component of a Pt bimetallic core-shell catalyst can occur even at room temp. under typical fuel cell cathode conditions. In an alk. environment the nanoparticles remain stable and the alteration in the surface compn. can be tracked in situ, but in an acidic electrolyte, any non-noble alloying material at the surface would immediately dissolve in the electrolyte. Therefore, such catalysts are expected to degrade steadily during operation in an acidic fuel cell until only Pt is left. [on SciFinder(R)]     «

Surface segregation of the non-noble component of a Pt bimetallic core-shell catalyst can occur even at room temp. under typical fuel cell cathode conditions. In an alk. environment the nanoparticles remain stable and the alteration in the surface compn. can be tracked in situ, but in an acidic electrolyte, any non-noble alloying material at the surface would immediately dissolve in the electrolyte. Therefore, such catalysts are expected to degrade steadily during operation in an acidic fuel cel...     »

CAN 151:554677 52-2 Electrochemical, Radiational, and Thermal Energy Technology Lehrstuhl Physikalische Chemie, Technische Universitaet Muenchen, Garching, Germany. Journal 0002-7863 39286-49-2 (Cobalt 25, platinum 75 (atomic)) Role: PEP (Physical, engineering or chemical process), PRP (Properties), TEM (Technical or engineered material use), PROC (Process), USES (Uses) (degrdn. of carbon-supported Pt3Co nanoparticles by surface segregation at cathodes of fuel cells); 7440-44-0 (Carbon) Role: PEP (Physical, engineering or chemical process), TEM (Technical or engineered material use), PROC (Process), USES (Uses) (degrdn. of carbon-supported Pt3Co nanoparticles by surface segregation at cathodes of fuel cells)     «

CAN 151:554677 52-2 Electrochemical, Radiational, and Thermal Energy Technology Lehrstuhl Physikalische Chemie, Technische Universitaet Muenchen, Garching, Germany. Journal 0002-7863 39286-49-2 (Cobalt 25, platinum 75 (atomic)) Role: PEP (Physical, engineering or chemical process), PRP (Properties), TEM (Technical or engineered material use), PROC (Process), USES (Uses) (degrdn. of carbon-supported Pt3Co nanoparticles by surface segregation at cathodes of fuel cells); 7440-44-0 (Carbon) Role: P...     »