期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 48, 页码 41945-41954出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16682
关键词
N-doped onion-like carbon; core-shell structure; magnetron sputtering; oxygen reduction reactive; nonprecious-metal catalysts
资金
- National Key R&D Program of China [2016YFA0200400]
- National Natural Science Foundation of China [51672101, 51602122]
- NSF of Jilin Province [20160520010JH, 20170520120JH]
- Aviation Science Foundation of China [201430R4001]
- Program for JLU Science and Technology Innovative Research Team
- China Postdoctrol Science Foundation [2016M600229]
The idea of a core-shell structure can promote the utilization of nonprecious metallic catalysts by enhancing their activity and stability for the oxygen reduction reaction (ORR). Developing a low-cost, high-efficiency, and high-reproducibility method for synthesizing core-shell-structured materials represents an urgent challenge. Here, we fabricate encapsulated Cu nanoparticles with nitrogen-doped onion-like graphite nanoshells (Cu@onion-like N-C) as an efficient ORR catalyst by magnetron sputtering, in which the graphite shells grow by an in situ self-assembly process activated by the surface-catalyzed behavior with Cu nanoparticles. The results show that the CuCN-650 degrees C catalyst achieves the optimized Cu@onion-like N-C structure with small-sized Cu nanoparticles and a few-layer nanoshells and exhibits excellent ORR electrocatalytic properties, including a half-wave potential and onset potential similar to those of commercial Pt/C, coupled with better stability and higher methanol tolerance than for commercial Pt/C in alkaline electrolytes. The internal Cu nanoparticles in the core-shell structure not only promote the formation of a high content of pyridinic N but also donate the electronic charges to outer N-doped C shells, and thus the synergistic effect between the encapsulated Cu nanoparticles and N-doped C shells is responsible for the excellent electrocatalytic activity for the ORR
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