Generic Synthesis of Carbon Nanotube Branches on Metal Oxide Arrays Exhibiting Stable High Rate and Long Cycle Sodium Ion Storage.
A new and generic strategy to construct interwoven carbon nanotube (CNT) branches on various metal oxide nanostructure arrays (exemplified by V2 O3 nanoflakes, Co3 O4 nanowires, Co3 O4 CoTiO3 composite nanotubes, and ZnO microrods) in order to enhance their electrochemical performance, is demonstrated for the first time. In the second part, the V2 O3 /CNTs core/branch composite arrays as the host for Na( storage are investigated in detail. This V2 O3 /CNTs hybrid electrode achieves a reversible charge storage capacity of 612 mAh g( 1) at 0.1 A g( 1) and outstanding high rate cycling stability (a capacity retention of 100% after 6000 cycles at 2 A g( 1) and 70% after 10 000 cycles at 10 A g( 1) Kinetics analysis reveals that the Na( storage is a pseudocapacitive dominating process and the CNTs improve the levels of pseudocapacitive energy by providing a conductive network.
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