首页 | 研究所概况 | 研究机构 | 研究队伍 | 研究生教育 | 蒋民华班 | 大型仪器 | 合作交流 | 人才招聘 | 内部通知 
当前位置: 首页>>文章速递>>正文
 
Simple synthesis and surface facet-tuning of ultrathin alloy-shells of Au@AuPd nanoparticles via silver-assisted co-reduction onto facet-controlled Au nanoparticles
2018年03月30日  

Simple synthesis and surface facet-tuning of ultrathin alloy-shells of Au@AuPd nanoparticles via silver-assisted co-reduction onto facet-controlled Au nanoparticles

Cuixia Bi, Yahui Song, Hongpeng He, Chenshuo Wu, Wei Du, Lihui Huang, Helmuth Moehwaldd and Haibing Xia *

J. Mater. Chem. A, 2018, 6, 17, 7675-7685

Abstract

In this work, we report the synthesis of hexoctahedral (HOH-shaped), elongated tetrahexahedral (ETHHshaped) and octahedral (OCT-shaped) Au@AuPd nanoparticles (NPs) via co-reduction of a trace amount of Au and Pd precursors by ascorbic acid (AA) with the aid of an elemental silver reservoir on the surface of the corresponding preformed Au NPs enclosed by different facets. Consequently, surface facets of alloy-shells of the resulting Au@AuPd NPs can be tuned, as they can retain the original surface facets of pre-formed, facet-controlled Au cores. It is found that both mass activities and specific activities of the three types of Au@AuPd NPs exhibit “volcano-type” dependence with respect to their Pd content in the surface of ultrathin AuPd alloy-shells. Moreover, HOH-shaped Au@Au0.20Pd2.0 NPs simultaneously display the best activity and excellent stability due to the exposed high-index facets of the AuPd alloyshell and the appropriate area ratio of active facets and inactive facets on the surfaces of ultrathin alloyshells. Furthermore, their ECSA value, mass activity and specific activity are 125.8 m2g-1, 11.9 A mgPd-1 and 9.5 mA cm-2, respectively, which are about 4-fold, 31-fold, and 7-fold better than those (28.4 m2 g-1, 0.38 A mgPd-1, and 1.34 mA cm-2) of commercial Pd/C catalysts, respectively. Thus, this work not only demonstrates that surface facets of core–shell Au@AuPd NPs can be engineered via co-reduction of a trace amount of Au and Pd precursors by AA with the aid of an elemental silver reservoir on the surface of preformed Au NPs, but also will open a new way to improve the electrocatalytic performance of CS Au@AuPd NPs by surface engineering.

 

 

关闭窗口

人事部 | 财务部 | 资产与实验室管理部 | 研究生院 | 信息化工作办公室 | 学生就业与发展指导服务中心 | 人才工作办公室 | 关于我们 | 联系我们

Copyright © 2015 山东大学晶体材料研究所 All Rights Reserved 版权所有
地址:济南市山大南路27号 邮编:250100