3D Nanoporous Gold with Very Low Parting Limit Derived from Au-Based Metallic Glass and Enhanced Methanol Electro-oxidation Catalytic Performance Induced by Metal Migration

被引:7
作者
Xu, Yi [1 ]
Yiu, Pak Man [1 ]
Shan, Guangcun [1 ,2 ]
Shibayama, Tamaki [3 ]
Watanabe, Seiichi [3 ]
Ohnuma, Masato [4 ]
Huang, Wei [5 ]
Shek, Chan-Hung [1 ]
机构
[1] City Univ Hong Kong, Dept Phys & Mat Sci, 83 Tat Chee Ave, Kowloon Tang, Hong Kong, Peoples R China
[2] Beihang Univ, Sch Instrumentat Sci & Optoelect Engn, 37 XueYuan Rd, Beijing 100095, Peoples R China
[3] Hokkaido Univ, Fac Engn, Ctr Adv Res Energy & Mat,Kita Ku, Div Quantum Sci & Engn,Lab Quantum Energy Convers, Kita 13,Nishi 8, Sapporo, Hokkaido 0608628, Japan
[4] Hokkaido Univ, Fac Engn, Div Quantum Sci & Engn, Lab Quantum Beam Syst Engn,Kita Ku, Kita 13,Nishi 8, Sapporo, Hokkaido 0608628, Japan
[5] Nanjing Tech Univ, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, IAM, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China
来源
CHEMNANOMAT | 2018年 / 4卷 / 01期
关键词
electrocatalysis; metal migration; metallic glass; methanol electro-oxidation; nanoporous gold; SHELL NANOPARTICLES; SURFACE-COMPOSITION; ALLOY; PD; OXIDATION; ELECTROCATALYSIS; DISSOLUTION; REACTIVITY; ELECTRODES; STABILITY;
D O I
10.1002/cnma.201700170
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nanoporous gold (NPG) with bi-continuous ligaments and pores structure has promising potential in functional applications, among which one prominent example is fuel cell electrocatalysts. However, current application of NPG is mostly limited to methanol electro-oxidation (MOR) due to its weak catalytic performance. Here we report a simple chemical dealloying process for generating peculiar three-dimensional (3D) free-standing NPG with parting limit' as low as 25% (lower than theoretical paring limit' 55%) and high specific surface area (maximum approximate to 31m(2)g(-1)) associated with a novel porous cone shaped protrusion' morphology. This NPG structure possesses the highest specific activity of MOR catalytic performance reported NPG catalysts so far. In addition, taking advantage of this excellent structural feature of the NPG, a nanoporous Pd catalyst (NPG@Pd) thin film was fabricated on the NPG substrate. The NPG@Pd catalyst exhibited greatly enhanced MOR performance (maximum MOR specific activity 2.14mAcm(-2)). We attribute the enhancement of MOR activity to the increase of active sites as well as the modification of surface composition and electronic structure due to migration of Au to the Pd thin film layer.
引用
收藏
页码:88 / 97
页数:10
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