Direct Synthesis of Spatially-Controlled Pt-on-Pd Bimetallic Nanodendrites with Superior Electrocatalytic Activity

Abstract

Here we report a facile synthesis of Pt-on-Pd bimetallic nanodendrites with a Pd interior and dendritic Pt exterior. The developed route rationally utilizes the spontaneous separation of the depositions of Pd and Pt, which endows direct formation of Pt-on-Pd nanodendrites. This is a truly simple and unique process that is quite different from the traditional seed-mediated growth strategy. Fine-tuning of the Pt and Pd ratios afforded Pt-on-Pd nanodendrites with superior electrocatalytic activity in comparison with commercial Pt electrocatalysts.

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

“…Pd@Pt NDs with nominal Pd:Pt molar ratio of 2:1 are synthesized via a one-step method with modification [19]. In the presence of Pluronic ® F127 (PEO 106 PPO 70 PEO 106 , Sigma Aldrich), Na 2 PdCl 4 and K 2 PtCl 4 were successively reduced by ascorbic acid (AA) at room temperature in aqueous solutions for 12 h. The Pd@Pt NDs obtained were then supported onto hydrogen peroxide pre-treated XC-72R carbon blacks [20] with metal loading of 20% by adding carbon blacks into the as-prepared Pd@Pt NDs colloid and stirring the mixture overnight.…”

Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications

“…A solution to enhancement the electrocatalytic properties is to mix the Pt with other elements or deposited on different supports 12 . Among Pt-based catalysts, Pt-Pd is one of the most attractive bimetallic systems due to its application as electrocatalyst in fuel cells [13][14][15] and various applications including hydrogenation [16][17] and oxidation of organic compounds 18 . Several studies have been carried out about the synthesis and electrocatalytic properties of the Pt-Pd bimetallic NPs [19][20][21][22] ; these bimetallic NPs can be produced generally , and spectroscopy data can be obtained either simultaneously or sequentially from the same region of the specimen 25 .…”

One-step synthesis of the PdPt bimetallic nanodendrites with controllable composition for methanol oxidation reaction

“…This special nanostructure can give rise to more catalytically active sites, such as boundaries and corner atoms, providing a high surface area in catalytic reactions. For example, the PdPt nanodendrites were acquired by following a facile aqueous synthetic method reported by Zhou et al [6], Yamauchi et al [11], and Zhang et al [30]. Regretfully, the catalytic performance toward methanol oxidation reaction (MOR) is far from meeting the application demands owing to the inapparent dendritic structure [6] and relatively large particle size [30].…”