Journal
ACS NANO
Volume 8, Issue 7, Pages 7279-7287Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn502341x
Keywords
heterogeneous structure; nanotube; lithium-ion battery; supercapacitor; multifunctional
Categories
Funding
- Smalley Institute for Nanoscale Science and Technology
- ONR MURI Program [00006766, N00014-09-1-1066]
- AFOSR MURI program [FA9550-12-1-0035]
- AFOSR [FA9550-09-1-0581]
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Three-dimensional heterogeneously nanostructured thin-film electrodes were fabricated by using Ta2O5 nanotubes as a framework to support carbon-onion-coated Fe2O3 nanoparticles along the surface of the nanotubes. Carbon onion layers function as microelectrodes to separate the two different metal oxides and form a nanoscale 3-D sandwich structure. In this way, space-charge layers were formed at the phase boundaries, and it provides additional energy storage by charge separation. These 3-D nanostructured thin films deliver both excellent U-ion battery properties (stabilized at 800 mAh cm(-3)) and supercapacitor (up to 18.2 mF cm(-2)) performance owing to the synergistic effects of the heterogeneous structure. Thus, Li-ion batteries and supercapacitors are successfully assembled into the same electrode, which is promising for next generation hybrid energy storage and delivery devices.
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