ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Mechanistic Insights into a Non-Classical Diffusion Pathway for the Formation of Hollow Intermetallics: A Route to Multicomponent Hollow Structures

Anumol, EA and Nethravathi, C and Ravishankar, N (2013) Mechanistic Insights into a Non-Classical Diffusion Pathway for the Formation of Hollow Intermetallics: A Route to Multicomponent Hollow Structures. In: Particle & Particle Systems Characterization, 30 (7). pp. 590-598.

Full text not available from this repository. (Request a copy)
Official URL: http://dx.doi.org/10.1002/ppsc.201300022

Abstract

Hollow nanostructures are used for various applications including catalysis, sensing, and drug delivery. Methods based on the Kirkendall effect have been the most successful for obtaining hollow nanostructures of various multicomponent systems. The classical Kirkendall effect relies on the presence of a faster diffusing species in the core; the resultant imbalance in flux results in the formation of hollow structures. Here, an alternate non-Kirkendall mechanism that is operative for the formation of hollow single crystalline particles of intermetallic PtBi is demonstrated. The synthesis method involves sequential reduction of Pt and Bi salts in ethylene glycol under microwave irradiation. Detailed analysis of the reaction at various stages indicates that the formation of the intermetallic PtBi hollow nanoparticles occurs in steps. The mechanistic details are elucidated using control experiments. The use of microwave results in a very rapid synthesis of intermetallics PtBi that exhibits excellent electrocatalytic activity for formic acid oxidation reaction. The method presented can be extended to various multicomponent systems and is independent of the intrinsic diffusivities of the species involved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: Electrocatalysis; Hollow Nanoparticles; Intermetallic Phases; Kirkendall Effect; Microwave-Assisted Synthesis
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Francis Jayakanth
Date Deposited: 26 Dec 2013 05:10
Last Modified: 26 Dec 2013 05:10
URI: http://eprints.iisc.ac.in/id/eprint/48074

Actions (login required)

View Item View Item