期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 46, 页码 39705-39712出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b14079
关键词
nanoporous gold; Pt monolayer; epitaxial growth; highly coordinated sites; oxygen reduction reaction
资金
- National Natural Science Foundation of China (NSFC) [21603161, 51671145]
- Macau Science and Technology Fund (FDCT) [002/2017/AFJ]
- Tianjin Municipal Science and Technology Commission [201514016, 16JCYBJC41600]
- NSFC [51761165012]
Pt with high coordination number (HCN) located in the defect surface sites is favorable for high oxygen reduction reaction activity. However, it is still a challenge to design and fabricate such a structure with a high density of Pt HCN sites at minimum Pt usage. Here, using nanoporous Au (NPG) that intrinsically possesses a higher proportion of HCN Au atoms over traditional nanoparticles, we epitaxially deposit Pt monolayer onto NPG to inherit the high-density HCN Pt sites. Among the NPG Pt catalysts, the one with a smaller ligament size possesses a higher proportion of HCN Pt atoms, thus exhibiting a 5.2-fold specific activity and 18.7-fold mass activity enhancement than the commercial Pt/C catalyst. Moreover, depositing Au atoms on the NPG-Pt surface can further increase the HCN Pt surface exposure, which leads to a 6.9-fold specific activity and 19.1-fold mass activity increase as compared to Pt/C.
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