Alloy Cu3Pt nanoframes through the structure evolution in Cu-Pt nanoparticles with a core-shell construction

Abstract

Noble metal nanoparticles with hollow interiors and customizable shell compositions have immense potential for catalysis. Herein, we present an unique structure transformation phenomenon for the fabrication of alloy Cu3Pt nanoframes with polyhedral morphology. This strategy starts with the preparation of polyhedral Cu-Pt nanoparticles with a core-shell construction upon the anisotropic growth of Pt on multiply twinned Cu seed particles, which are subsequently transformed into alloy Cu3Pt nanoframes due to the Kirkendall effect between the Cu core and Pt shell. The as-prepared alloy Cu3Pt nanoframes possess the rhombic dodecahedral morphology of their core-shell parents after the structural evolution. In particular, the resulting alloy Cu3Pt nanoframes are more effective for oxygen reduction reaction but ineffective for methanol oxidation reaction in comparison with their original Cu-Pt core-shell precursors.

Carbon-Supported Pt-Based Alloy Electrocatalysts for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells: Particle Size, Shape, and Composition Manipulation and Their Impact to Activity

“…The ORR effect of facet was also studied in other PtM (M = Cu, Mn) alloy nanocrystals supported on carbon. For example, using an interior erosion method, Han et al 297 obtained polyhedral Cu 3 Pt nanoframes with a core−shell structure, which was also a single crystalline face-centered cubic atomic structure enclosed by the {111} planes. After incorporation of carbon, carbon supported Cu 3 Pt catalyst exhibited a superior ORR activity.…”

Core–shell nanoparticles: synthesis and applications in catalysis and electrocatalysis

“…), 293,434,[446][447][448][449][450][451] mainly because they (i) are inexpensive, (ii) can be prepared easily, and, most importantly, (iii) can be separated magnetically, which is undoubtedly a great advantage from sustainable chemistry viewpoint. Among these options, earth-abundant iron oxide (magnetite and maghemite) or iron supports are considered a superior class for decorating (or being decorated with) various catalytic active shells (Cu, Pt, Ni, etc.…”

Platinum–Copper Nanoframes: One‐Pot Synthesis and Enhanced Electrocatalytic Activity

“…Up to now,m ethods fort he synthesis of metallic nanoframes can be roughly divided into three categories:1 )the traditional templatem ethod; [6] 2) the sacrificial template method, including electrochemical displacement [7] and etching; [8] 3) no template synthesis method, including the methods based on physical/chemical processes, such as Kirkendall effect. [9] Although the use of these methods can preparen anoframes with various shapes and elements, most of these preparation methods consist of multiple steps, which meanst hat the metal reagents are supplied at different stages to prevent their co-reduction. [4b, e, 5b, 10] Recently,o ne-step synthesis of metallicn anoframes, in which all the agentsa re added att he same time, has attracted much attention.…”