Dendritic platinum–copper bimetallic nanoassemblies with tunable composition and structure: Arginine-driven self-assembly and enhanced electrocatalytic activity
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Yu Chen3(
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Novel self-assembled architectures have received a growing amount of attention and have significant potential for application in catalysis/electrocatalysis. Herein, we take advantage of the unique coordination and self-assembly properties of arginine for the preparation of dendritic PtCu bimetallic nanoassemblies with tunable chemical composition and structure. Strong interactions between the arginine molecules are key in driving the self-assembly of primary nanocrystals. In addition, the strong coordination interactions between arginine and metal ions is responsible for the formation of Pt–Cu alloys. We also investigated the electrocatalytic activity of various dendritic PtCu bimetallic nanoassemblies towards the methanol oxidation reaction. Pt3Cu1 nanoassemblies exhibited excellent electrocatalytic activity and stability in comparison with other PtCu bimetallic nanoassemblies (Pt1Cu3, Pt1Cu1) and commercial Pt black, due to their unique dendritic structures and the synergistic effect between the Pt and Cu atoms.
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Dendritic platinum–copper bimetallic nanoassemblies with tunable composition and structure: Arginine-driven self-assembly and enhanced electrocatalytic activity
), Yu Chen3(
)
Abstract
Novel self-assembled architectures have received a growing amount of attention and have significant potential for application in catalysis/electrocatalysis. Herein, we take advantage of the unique coordination and self-assembly properties of arginine for the preparation of dendritic PtCu bimetallic nanoassemblies with tunable chemical composition and structure. Strong interactions between the arginine molecules are key in driving the self-assembly of primary nanocrystals. In addition, the strong coordination interactions between arginine and metal ions is responsible for the formation of Pt–Cu alloys. We also investigated the electrocatalytic activity of various dendritic PtCu bimetallic nanoassemblies towards the methanol oxidation reaction. Pt3Cu1 nanoassemblies exhibited excellent electrocatalytic activity and stability in comparison with other PtCu bimetallic nanoassemblies (Pt1Cu3, Pt1Cu1) and commercial Pt black, due to their unique dendritic structures and the synergistic effect between the Pt and Cu atoms.
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Acknowledgements
This research was sponsored by National Natural Science Foundation of China (Nos. 21473111, 21576139, 21503111, 21376122, and 21273116), United Fund of NSFC and Yunnan Province (No. U1137602), Natural Science Foundation of Jiangsu Province (No. BK20131395), Natural Science Foundation of Shaanxi Province (No. 2015JM2043), Fundamental Research Funds for the Central Universities (No. GK201402016), China Scholarship Council (CSC, No. 201506860013), University Postgraduate Research and Innovation Project in Jiangsu Province (No. KYZZ15_0213), National and Local Joint Engineering Research Center of Biomedical Functional Material, and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions. The authors also thank John B. Goodenough UT-Austin for his help with XPS and electrochemical measurements during the article revision.
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