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Title: Hollow core-shell nanostructure supercapacitor electrodes : gap matters
Authors: Guan, Cao
Xia, Xinhui
Meng, Nan
Zeng, Zhiyuan
Cao, Xiehong
Soci, Cesare
Zhang, Hua
Fan, Hong Jin
Keywords: DRNTU::Engineering::Electrical and electronic engineering::Nanoelectronics
DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2012
Source: Guan, C., Xia, X., Meng, N., Zeng, Z., Cao, X., Soci, C., Zhang, H., & Fan, H. J. (2012). Hollow core-shell nanostructure supercapacitor electrodes: gap matters. Energy & Environmental Science, 5(10), 9085-9090.
Series/Report no.: Energy & environmental science
Abstract: Hollow core-shell nanorods with a nanogap are designed and constructed with the assistance of atomic layer deposition (ALD) for energy storage applications. As a demonstration, CoO nanorods and NiO nanowalls are enclosed by a TiO2 nanotube shell, forming the “wire in tube” and “wall in box” structures, respectively. A thin sacrificial layer of Al2O3 is deposited by ALD and removed eventually, forming a nanogap between the CoO core (or the NiO nanowall) and the TiO2 shell. When they are tested as supercapacitor electrodes, an evident difference between the solid core–shell nanostructure and hollow ones can be found; for example, the hollow structure shows [similar]2 to 4 times the capacitance compared to the solid wires. The electrochemical properties are also superior compared to the bare nanorods without the nanotube shell. The enhancement is ascribed to the conformal hollow design which provides enlarged specific surface areas and a shorter ion transport path. It is prospected that such a positive nanogap effect may also exist in other electrochemical cell electrodes such as lithium ion batteries and fuel cells.
DOI: 10.1039/c2ee22815g
Rights: © 2012 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Energy & Environmental Science, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles
SPMS Journal Articles

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