期刊
NANO RESEARCH
卷 10, 期 6, 页码 2056-2069出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1395-0
关键词
platinum; porous; oxygen reduction reaction; enzyme mimic; antibacterial
类别
资金
- National Key Research and Development Program from the Ministry of Science and Technology of China [2016YFC0207102]
- National Natural Science Foundation of China [21501034, 21573050, 21503053]
- Chinese Academy of Sciences [XDA09030303]
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety
Enhancing the activity of Pt-based nanocatalysts is of great significance yet a challenge for the oxygen reduction reaction (ORR). In this work, a series of porous Pt/Ag nanoparticles (NPs) were fabricated from regular PtxAg100-x (x = 25, 50, 75) octahedra by a facile and economical dealloying process. Remarkable enhancement in multiple enzyme-mimic activities related to ORR was observed for the dealloyed Pt50Ag50 (D-Pt50Ag50) NPs. This effect can be attributed to the resulting Pt-rich surface structure, increased surface area, and a synergistic effect of Pt and Ag atoms in the D-Pt50Ag50 NPs. Furthermore, the D-Pt50Ag50 NPs exerted excellent antibacterial effects on two model bacteria (gram-negative Escherichia coli and gram-positive Staphylococcus aureus). The present work represents a significant advance in the exploration of the relation between controllable synthesis of high-quality nanoalloys and their novel catalytic properties for various promising applications, including catalysts, biosensors, and biomedicine.
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