4.6 Article

Synthesis of PtAu Alloy Nanocrystals Supported on Three-Dimensional Carbon with Enhanced Electrocatalytic Properties

Journal

CATALYSTS
Volume 13, Issue 3, Pages -

Publisher

MDPI
DOI: 10.3390/catal13030464

Keywords

noble metals; alloy nanocrystals; methanol oxidation; hydrogen evolution; electrocatalytic

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Sub-nanosized PtAu particles within three-dimensional carbon materials were prepared using a mercaptosilane-assisted method. This strategy allows for effective size control of PtAu particles without the need for an additional carbon precursor. The as-synthesized three-dimensional carbon exhibited superior properties compared to other carbon materials. PtAu particles on three-dimensional carbon showed higher activity for methanol oxidation and hydrogen evolution reactions compared to Pt/3D carbon and a commercial Pt/C catalyst.
Sub-nanosized PtAu particles within three-dimensional carbon materials were obtained via a mercaptosilane-assisted preparation method. This strategy can effectively control the size of PtAu particles while avoiding the use of an additional carbon precursor. The as-synthesized three-dimensional carbon (3D carbon) material possesses excellent properties compared to other carbon materials. PtAu particles on three-dimensional carbon (PtAu/3D carbon) exhibited superior activities for methanol oxidation and hydrogen evolution reactions compared to Pt/3D carbon and a commercial Pt/Carbon (Pt/C) catalyst. Specifically, the methanol peak current density on PtAu/3D carbon was almost 2.3 times higher than that of Pt/3D carbon and 1.9 times higher than that of commercial Pt/C. The Tafel slopes of PtAu/3D carbon, Pt/3D carbon, and the commercial Pt/C were approximately 112, 124, and 106 mV dec(-1), respectively, demonstrating that electrochemical desorption is the rate-limiting step in the hydrogen evolution reaction of the as-synthesized catalysts.

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