期刊
SMALL
卷 13, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201603387
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资金
- National Natural Science Foundation of China [51271148, 50971100]
- State Key Laboratory of Solidification Processing in China [150-ZH-2016]
- Aeronautic Science Foundation Program of China [2012ZF53073]
- Science and Technology Innovation Fund of Western Metal Materials [XBCL-2-11]
- Ministry of Education of China [20136102110013]
The electrocatalytic activity of Pt-based alloys exhibits a strong dependence on their electronic structures, but a relationship between electronic structure and oxygen reduction reaction (ORR) activity in Ag-based alloys is still not clear. Here, a vapor deposition based approach is reported for the preparation of Ag75M25 (M = Cu, Co, Fe, and In) and AgxCu100-x (x = 0, 25, 45, 50, 55, 75, 90, and 100) nanocatalysts and their electronic structures are determined by valence band spectra. The relationship of the d-band center and ORR activity exhibits volcano-shape behaviors, where the maximum catalytic activity is obtained for Ag75Cu25 alloys. The ORR enhancement of Ag75Cu25 alloys originates from the 0.12 eV upshift in d-band center relative to pure Ag, which is different from the downshift in the d-band center in Pt-based alloys. The activity trend for these Ag75M25 alloys is in the order of Ag75Cu25 > Ag75Fe25 > Ag75Co25. These results provide an insight to understand the activity and stability enhancement of Ag75Cu25 and Ag50Cu50 catalysts by alloying.
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