Facile preparation of carbon-supported PtNi hollow nanoparticles with high electrochemical performance

Title
Facile preparation of carbon-supported PtNi hollow nanoparticles with high electrochemical performance
Authors
배종성유성종임윤택김소정임이랑Junghun Choi남기석황승준임태훈김수길김필
Keywords
연료전지; PtNi alloy catalysts; Hollow nanoparticles; 산소환원반응
Issue Date
2012-05
Publisher
Journal of materials chemistry
Citation
VOL 22, NO 18, 8820-8825
Abstract
To design Pt-based materials with a hollow structure via a galvanic reaction would be one of the effective ways to prepare electro- catalysts with high activity. The galvanic reaction between Pt ions and metal template is usually conducted under limited conditions, which makes the preparation of Pt hollow nanoparticles laborious. Here, we introduce a one-step and one-pot synthetic approach for the preparation of carbon-supported PtNi alloy hollow nanoparticles with a narrow size distribution. Prepared PtNi alloys were characterized by a nonporous shell consisting of a Pt-enriched surface layer and an inner alloy layer of Pt and Ni. Due to its unique structural advantages, this material showed excellent electrocatalytic performance for oxygen reduction (3.3- and 7.8-fold enhanced mass and specific activities compared to those of a commercial carbon-supported Pt nanoparticle). A possible mechanism for the formation of PtNi hollow structure is suggested.
URI
http://pubs.kist.re.kr/handle/201004/42203
ISSN
09599428
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KIST Publication > Article
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