Journal
ACS NANO
Volume 6, Issue 3, Pages 2410-2419Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn2046828
Keywords
electrocatalysis; hollow nanocrystals; oxygen reduction; palladium; platinum
Categories
Funding
- Basic Science Research Programs [2010-0029149]
- EPB Center [2008-0062042]
- Future-based Technology Development Program (Nano Fields) [2009-0082640]
- WCU Program through the National Research Foundation (NRF) [R31-2008-000-10071-0]
- Korean government (MEST)
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Pd-Pt alloy nanocrystals (NCs) with hollow structures such as nanocages with porous walls and dendritic hollow structures and Pd@Pt core-shell dendritic NCs could be selectively synthesized by a galvanic replacement method with uniform Pd octahedral and cubic NCs as sacrificial templates. Fine control over the degree of galvanic replacement of Pd with Pt allowed the production of Pd-Pt NCs with distinctly different morphologies. The synthesized hollow NCs exhibited considerably enhanced oxygen reduction activities compared to those of Pd@Pt core-shell NCs and a commercial Pt/C catalyst, and their electrocatalytic activities were highly dependent on their morphologies. The Pd-Pt nanocages prepared from octahedral Pd NC templates exhibited the largest improvement in catalytic performance. We expect that the present work will provide a promising strategy for the development of efficient oxygen reduction electrocatalysts and can also be extended to the preparation of other hybrid or hetero-nanostructures with desirable morphologies and functions.
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