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
 
Regulating Surface Facets of Metallic Aerogel Electrocatalysts by Size-Dependent Localized Ostwald Ripening
2018年06月21日  

Regulating Surface Facets of Metallic Aerogel Electrocatalysts by Size-Dependent Localized Ostwald Ripening

Wenchao Duan, Peina Zhang, Yujiao Xiahou, Yahui Song, Cuixia Bi, Jie Zhan, Wei Du, Lihui Huang, Helmuth Möhwald, and Haibing Xia*

 ACS Appl. Mater. Interfaces, 2018, 10, 27, 23081–23093

Abstract

It is well known that the activity and stability of electrocatalysts are largely dependent on their surface facets. In this work, we have successfully regulated surface facets of three-dimensional (3D) metallic Aum-n aerogels by salt-induced assembly of citrate-stabilized gold nanoparticles (Au NPs) of two different sizes and further size-dependent localized Ostwald ripening at controlled particle number ratios, where m and n represent the size of Au NPs. In addition, 3D Aum-n–Pd aerogels were further synthesized on the basis of Aum-n aerogels and also bear controlled surface facets because of the formation of ultrathin Pd layers on Aum-n aerogels. Taking the electrooxidation of small organic molecules (such as methanol and ethanol) by the resulting Aum-n and Aum-n–Pd aerogels as examples, it is found that surface facets of metallic aerogels with excellent performance can be regulated to realize preferential surface facets for methanol oxidation and ethanol oxidation, respectively. Moreover, they also indeed simultaneously bear high activity and excellent stability. Furthermore, their activities and stability are also highly dependent on the area ratio of active facets and inactive facets on their surfaces, respectively, and these ratios are varied via the mismatch of sizes of adjacent NPs. Thus, this work not only demonstrates the realization of the regulation of the surface facets of metallic aerogels by size-dependent localized Ostwald ripening but also will open up a new way to improve electrocatalytic performance of 3D metallic aerogels by surface regulation.

ami-2018-04823t.gif

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