Issue 47, 2015
From the journal:

Nanoscale

Understanding the effect of ultrathin AuPd alloy shells of irregularly shaped Au@AuPd nanoparticles with high-index facets on enhanced performance of ethanol oxidation†

Cuixia Bi,a   Cong Feng,a   Tingting Miao,a   Yahui Song,a   Dayang Wangb  and  Haibing Xia*a  

* Corresponding authors

a State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China
E-mail: hbxia@sdu.edu.cn

b School of Civil, Environmental, and Chemical Engineering, RMIT University, VIC 3001, Australia

Abstract

In this study, irregularly shaped, concave cuboidal Au@AuPd nanoparticles (ISCC-Au@AuPd NPs) with high-index facets were synthesized via Pd overgrowth on pre-formed ISCC-Au NPs with a concentration of Pd precursors as low as 2%. The AuPd alloy nature of the resulting shells was confirmed by X-ray photoelectron spectroscopy, cyclic voltammogram analysis, and energy dispersive X-ray spectroscopy. Among the irregularly shaped NPs obtained, the ISCC-Au97.5@Au0.5Pd2.0 NPs display the largest electrochemically active surface area (up to 92.11 m2 g−1), as their closed-packed agglomeration was prevented, and the best long-term stability with respect to ethanol oxidation (0.50 M) in alkaline media (0.30 KOH) by efficiently removing intermediates. Their mass- and ECSA-normalized current densities (4.15 A mgPd−1 and 4.51 mA cm−2) are about 20.7 times and 6.9 times higher than those of commercial Pd/C catalysts (0.20 A mgPd−1 and 0.65 mA cm−2), respectively.

Graphical abstract: Understanding the effect of ultrathin AuPd alloy shells of irregularly shaped Au@AuPd nanoparticles with high-index facets on enhanced performance of ethanol oxidation

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Article information

DOI
https://doi.org/10.1039/C5NR06035D
Article type
Paper
Submitted
03 Sep 2015
Accepted
27 Oct 2015
First published
29 Oct 2015

Nanoscale, 2015,7, 20105-20116

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Understanding the effect of ultrathin AuPd alloy shells of irregularly shaped Au@AuPd nanoparticles with high-index facets on enhanced performance of ethanol oxidation

C. Bi, C. Feng, T. Miao, Y. Song, D. Wang and H. Xia, Nanoscale, 2015, 7, 20105 DOI: 10.1039/C5NR06035D

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