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Open-Ended, N-Doped Carbon Nanotube-Graphene Hybrid Nanostructures as High-Performance Catalyst Support

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Zhang,  Qiang
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Su,  Dang Sheng
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Lv, R., Cui, T., Jun, M.-S., Zhang, Q., Cao, A., Su, D. S., et al. (2011). Open-Ended, N-Doped Carbon Nanotube-Graphene Hybrid Nanostructures as High-Performance Catalyst Support. Advanced Functional Materials, 21(5), 999-1006. doi:10.1002/adfm.201001602.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-2FA6-A
Abstract
A hierarchical N-doped carbon nanotube-graphene hybrid nanostructure (NCNT-GHN), in which the graphene layers distributed inside the CNT inner cavities, is designed to support noble metal (e.g. PtRu) nanoparticles efficiently. Well-dispersed PtRu nanoparticles with diameters of 2-4 nm are immobilized onto NCNT-GHN supports by a low-temperature chemical reduction method without requiring any pretreatment. Compared with conventional CNTs and commercial catalyst, much enhanced catalytic performance is achieved by a synergistic effect of the hierarchical structure (graphene-CNT hybrid) and electronic modulation (N-doping) during the methanol electrooxidation reaction. An improved singlecell performance with long-term stability is also demonstrated by using NCNT-GHN as catalyst support. These results explain previously reported findings on highly dispersed gold nanoparticles, in which the peripheral atoms are positively charged.