Journal
NANOSCALE
Volume 7, Issue 11, Pages 4890-4893Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr00135h
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Funding
- National Natural Science Foundation of China [21021062, 21271099, 91022031]
- National Basic Research Program of China [2013CB922100,, 2011CB808704]
- China Scholarship Council
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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.
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