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Adsorbate-induced surface segregation for core-shell nanocatalysts.

Karl J J Mayrhofer¹, Viktorija Juhart, Katrin Hartl

¹Lehrstuhl Physikalische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany. karl.mayrhofer@mytum.de

Angewandte Chemie (International Ed. in English)

|April 8, 2009

Summary

This summary is machine-generated.

CO annealing treatment modifies carbon-supported platinum-cobalt (Pt(3)Co) catalyst surfaces. Platinum segregation creates a Pt shell, enhancing oxygen reduction reaction activity compared to untreated catalysts or pure platinum.

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Area of Science:

Materials Science
Catalysis
Electrochemistry

Background:

Carbon-supported platinum-cobalt (Pt(3)Co) alloys are crucial catalysts.
Understanding surface composition changes is key to catalyst performance.
The oxygen reduction reaction (ORR) is a critical process in fuel cells.

Purpose of the Study:

To investigate the effect of CO-annealing on the surface composition of Pt(3)Co nanoparticles.
To determine if surface modification enhances catalytic activity for the ORR.

Main Methods:

Carbon-supported Pt(3)Co catalyst nanoparticles were synthesized.
The catalysts underwent a CO-annealing treatment.
Catalytic activity for the oxygen reduction reaction was evaluated.

Main Results:

CO annealing induced significant platinum (Pt) atom segregation to the surface.
This resulted in the formation of core-shell nanoparticles with a Pt-rich surface.
The modified Pt(3)Co catalyst exhibited superior ORR activity compared to pristine Pt(3)Co and pure Pt catalysts.

Conclusions:

Surface segregation of platinum via CO annealing is an effective strategy to enhance Pt(3)Co catalyst performance.
The core-shell structure with a Pt-rich surface improves oxygen reduction reaction kinetics.
This approach offers a pathway for designing advanced electrocatalysts.