title: Dumbbell-like Au-Fe3O4 nanoparticles: a new nanostructure for supercapacitors.
abstract: Monodispersed dumbbell-like Au-Fe3O4 nanoparticles (NPs) were synthesized and studied for use in supercapacitors. These dumbbell NPs show Au/Fe3O4-size dependent capacitive behaviors and the 7-14 nm Au-Fe3O4 NPs have the best specific capacitance of 464 F g(-1) at 1 A g(-1) and capacity retention of 86.4% after 1000 cycles, much larger than pure Fe3O4 NPs (160 F g(-1) and 72.8% retention). This capacitive enhancement is believed to arise from the Au-induced increase in electron transfer across the dumbbell-like NPs. Thise report demonstrates a new strategy to enhance oxide NP capacitance for applications in high performance supercapacitors.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China. youxz@nju.edu.cn.
authors.forename: Sheng
authors.initials: S
authors.lastname: Liu
authors.forename: Shaojun
authors.initials: S
authors.lastname: Guo
authors.forename: Shouheng
authors.initials: S
authors.lastname: Sun
authors.forename: Xiao-Zeng
authors.initials: XZ
authors.lastname: You