High-Index Facets Bounded Platinum–Lead Concave Nanocubes with Enhanced Electrocatalytic Properties

High-index facets bounded platinum-based alloy nanocrystals usually exhibit enhanced electrocatalytic activity. However, the high surface energy, thermodynamic instability, and lattice mismatch make it a significant challenge to synthesize well-defined bimetallic nanocrystals with high-index facets....

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Bibliographic Details
Published in:Chemistry of materials 2017-05, Vol.29 (10), p.4557-4562
Main Authors: Huang, Liang, Zhang, Xueping, Han, Yujie, Wang, Qingqing, Fang, Youxing, Dong, Shaojun
Format: Article
Language:English
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Summary:High-index facets bounded platinum-based alloy nanocrystals usually exhibit enhanced electrocatalytic activity. However, the high surface energy, thermodynamic instability, and lattice mismatch make it a significant challenge to synthesize well-defined bimetallic nanocrystals with high-index facets. Here we developed a one-step wet-chemical synthesis of uniform PtPb concave nanocubes (CNCs) enclosed by {520} high-index facets. The as-prepared PtPb CNCs exhibited high synthetic yield and highly concave structure with an average size of 14 nm. Moreover, the synergistic effects and exposed {520} facets endowed the PtPb CNCs with excellent stability and electrocatalytic mass activity toward the methanol oxidation reaction (MOR), which was 2.16- and 4.62-times higher than PtPb nanocubes (NCs) and commercial Pt/C catalysts, respectively. This work provides a new way for rational design and practical application of efficient catalysts.
ISSN:0897-4756
1520-5002
DOI:10.1021/acs.chemmater.7b01282