Preparation of Carbon Supported Nanosegregated Pt Alloy Catalysts for the Oxygen Reduction Reaction Using a Silica Encapsulation Process to Inhibit Sintering Effect During Heat Treatment

Title
Preparation of Carbon Supported Nanosegregated Pt Alloy Catalysts for the Oxygen Reduction Reaction Using a Silica Encapsulation Process to Inhibit Sintering Effect During Heat Treatment
Authors
오형석오종길이웅희김한성
Issue Date
2012-08
Publisher
Journal of materials chemistry
Citation
VOL 22, NO 30-15220
Abstract
The heat treatment of alloy nanoparticles to improve their catalytic properties generally results in severe sintering. In this study, we report a new synthetic process of silica encapsulation to inhibit the sintering of Pt3Co1 alloy particles during heat treatment at high temperature. The silica layer acts as a physical barrier to prevent sintering; thus, the carbon-supported Pt3Co1 alloy nanoparticles retained their small particle size after heat treatment. The heat treatment allows the atoms to rearrange themselves, which results in a Pt-rich surface of the alloy nanoparticles. As a result, catalytic activity and stability were improved significantly.
URI
http://pubs.kist.re.kr/handle/201004/67017
ISSN
0959-9428
Appears in Collections:
KIST Publication > Article
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