ausblenden:
Schlagwörter:
Carbon nanotube; graphene; hybrid nanostructure; fuel cell
Zusammenfassung:
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.
