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Synthesis of self-assembled PtPdAg nanostructures with a high catalytic activity for oxygen reduction reactions

Abstract

Designing a self-assembled structure for a Pt-based catalyst offers a great opportunity to enhance the electrocatalytic performance and maximize the use of precious metal.Herein we report an etching method based on thermal treatment for removal of less active metal from Pt-based alloy for enhancement of Oxygen reducing reaction. PtPdAg nanostructures self-assembly can be easily controlled to dimer stage or nanowires by stirring the nanoparticle in formamide with or without Potassium iodide under heat for specific times. Thus an Oxygen reducing reaction-favored PtPdAg hollow nanoparticles, nanodimers and nanowires catalystsare synthesized, all of which have been demonstrated to be promoting factors for ORR.In Pt-based catalyst, the arrangement and configuration of surface or topmost few layer atoms influence the adsorption of oxygen and activation for ORR.PtPdAg dimer catalyst shows excellent ORR activity than the other PtPdAg nanostructures and commercial Pt/C i.e7.2 times higher specific activity and 4.1times higher mass activity.We further carried the DFT calculations and from the results, we conclude that, the most chemically in equivalent structure such as the PtPdAg/C nanodimer alloys possess the weakest oxygen binding energy.

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Publication details

The article was received on 03 May 2018, accepted on 11 Aug 2018 and first published on 13 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR03593H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Synthesis of self-assembled PtPdAg nanostructures with a high catalytic activity for oxygen reduction reactions

    X. Wang, M. A. Ud Din, F. Saleem and M. Zulfiqar, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR03593H

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