Development of Robust Pt Shell through Organic Hydride Donor in PtCo@Pt Core-Shell Electrocatalysts for Highly Stable Proton Exchange Membrane Fuel Cells

Title
Development of Robust Pt Shell through Organic Hydride Donor in PtCo@Pt Core-Shell Electrocatalysts for Highly Stable Proton Exchange Membrane Fuel Cells
Authors
유성종박희영이세현장인준장주혁최대일이국승안도천강윤식
Issue Date
2019-11
Publisher
Journal of catalysis
Citation
VOL 379-120
Abstract
Platinum alloys with other transition metals are widely used as catalysts as a promising strategy to improve the activity. However, the vulnerability of transition metals to the liquid electrolyte and fuel gases present during the device operation results in degradation of the catalytic activity. Highly stable catalyst is achieved by encapsulating the carbon-supported PtCo intermetallic core nanoparticles in a robust Pt shell. The hydride from Hantzsch ester reduces the residual Cl on the surface of the Pt skeleton and slowly forms negatively charged defect sites without damaging the core structure. Then, a secondary Pt reduction reaction via the hydride is employed to cover the activated surfaces of the Pt skeleton to optimize the shell thickness without the formation of isolated Pt nanoparticles. The PtCo@Pt with the unique Pt shell shows higher catalytic activity and durability than commercial Pt/C for oxygen reduction reaction electrocatalysts in proton exchange membrane fuel cells.
URI
http://pubs.kist.re.kr/handle/201004/70266
ISSN
0021-9517
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KIST Publication > Article
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