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Polyhedral Palladium-Silver Alloy Nanocrystals as Highly Active and Stable Electrocatalysts for the Formic Acid Oxidation Reaction.

Fu GT, Liu C, Zhang Q, Chen Y, Tang YW - Sci Rep (2015)

Bottom Line: Polyhedral noble-metal nanocrystals have received much attention and wide applications as electrical and optical devices as well as catalysts.In this work, a straightforward and effective hydrothermal route for the controllable synthesis of the high-quality Pd-Ag alloy polyhedrons with uniform size is presented.As a preliminary electrochemical application, the Pd-Ag alloy polyhedrons are applied in the formic acid oxidation reaction, which shows higher electrocatalytic activity and stability than commercially available Pd black due to the "synergistic effects" between Pd and Ag atoms.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China.

ABSTRACT
Polyhedral noble-metal nanocrystals have received much attention and wide applications as electrical and optical devices as well as catalysts. In this work, a straightforward and effective hydrothermal route for the controllable synthesis of the high-quality Pd-Ag alloy polyhedrons with uniform size is presented. The morphology, composition and structure of the Pd-Ag alloy polyhedrons are fully characterized by the various physical techniques, demonstrating the Pd-Ag alloy polyhedrons are highly alloying. The formation/growth mechanisms of the Pd-Ag alloy polyhedrons are explored and discussed based on the experimental observations and discussions. As a preliminary electrochemical application, the Pd-Ag alloy polyhedrons are applied in the formic acid oxidation reaction, which shows higher electrocatalytic activity and stability than commercially available Pd black due to the "synergistic effects" between Pd and Ag atoms.

No MeSH data available.


(A,B) Typical TEM images and (C) HRTEM image of the Pd–Ag alloy polyhedrons. (D) HRTEM image of an individual Pd–Ag polyhedron, the inset show the corresponding FFT pattern.
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f2: (A,B) Typical TEM images and (C) HRTEM image of the Pd–Ag alloy polyhedrons. (D) HRTEM image of an individual Pd–Ag polyhedron, the inset show the corresponding FFT pattern.

Mentions: The morphology of the Pd–Ag alloy nanocrystals was investigated using transmission electron microscopy (TEM). As observed in low-resolution TEM images, the as-synthesized Pd–Ag alloy nanocrystals exhibit the like-sphere morphology in terms of size and distribution (Fig. 2A,B and Figure S2). The average size of the Pd–Ag alloy nanocrystals is ca. 12 ± 3 nm. In fact, the Pd–Ag alloy nanocrystals are polyhedral nanostructures with obvious edges and borders, which can be observed on the high-resolution TEM (HRTEM) (Fig. 2C). The fast Fourier transform (FFT) pattern on an individual Pd–Ag alloy nanocrystals clearly demonstrates the single-crystalline nature (Fig. 2D). The interval between two lattice fringes from the magnified HRTEM image is measured to be 0.228 nm (Figure S3), closed to the {111} lattice spacing at this crystal orientations.


Polyhedral Palladium-Silver Alloy Nanocrystals as Highly Active and Stable Electrocatalysts for the Formic Acid Oxidation Reaction.

Fu GT, Liu C, Zhang Q, Chen Y, Tang YW - Sci Rep (2015)

(A,B) Typical TEM images and (C) HRTEM image of the Pd–Ag alloy polyhedrons. (D) HRTEM image of an individual Pd–Ag polyhedron, the inset show the corresponding FFT pattern.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4556982&req=5

f2: (A,B) Typical TEM images and (C) HRTEM image of the Pd–Ag alloy polyhedrons. (D) HRTEM image of an individual Pd–Ag polyhedron, the inset show the corresponding FFT pattern.
Mentions: The morphology of the Pd–Ag alloy nanocrystals was investigated using transmission electron microscopy (TEM). As observed in low-resolution TEM images, the as-synthesized Pd–Ag alloy nanocrystals exhibit the like-sphere morphology in terms of size and distribution (Fig. 2A,B and Figure S2). The average size of the Pd–Ag alloy nanocrystals is ca. 12 ± 3 nm. In fact, the Pd–Ag alloy nanocrystals are polyhedral nanostructures with obvious edges and borders, which can be observed on the high-resolution TEM (HRTEM) (Fig. 2C). The fast Fourier transform (FFT) pattern on an individual Pd–Ag alloy nanocrystals clearly demonstrates the single-crystalline nature (Fig. 2D). The interval between two lattice fringes from the magnified HRTEM image is measured to be 0.228 nm (Figure S3), closed to the {111} lattice spacing at this crystal orientations.

Bottom Line: Polyhedral noble-metal nanocrystals have received much attention and wide applications as electrical and optical devices as well as catalysts.In this work, a straightforward and effective hydrothermal route for the controllable synthesis of the high-quality Pd-Ag alloy polyhedrons with uniform size is presented.As a preliminary electrochemical application, the Pd-Ag alloy polyhedrons are applied in the formic acid oxidation reaction, which shows higher electrocatalytic activity and stability than commercially available Pd black due to the "synergistic effects" between Pd and Ag atoms.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China.

ABSTRACT
Polyhedral noble-metal nanocrystals have received much attention and wide applications as electrical and optical devices as well as catalysts. In this work, a straightforward and effective hydrothermal route for the controllable synthesis of the high-quality Pd-Ag alloy polyhedrons with uniform size is presented. The morphology, composition and structure of the Pd-Ag alloy polyhedrons are fully characterized by the various physical techniques, demonstrating the Pd-Ag alloy polyhedrons are highly alloying. The formation/growth mechanisms of the Pd-Ag alloy polyhedrons are explored and discussed based on the experimental observations and discussions. As a preliminary electrochemical application, the Pd-Ag alloy polyhedrons are applied in the formic acid oxidation reaction, which shows higher electrocatalytic activity and stability than commercially available Pd black due to the "synergistic effects" between Pd and Ag atoms.

No MeSH data available.