Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 9, Pages 3017-3024Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.11.059
Keywords
Porous oxide/hydroxide; Porous carbon; Metal-organic framework; Asymmetric capacitor; Electrochemical performance
Funding
- Chinese National Science Foundation [U0734002]
- Shanghai Basic Key Program [09JC1415100]
- Shanghai Nanotechnology Promotion Center [0852nm0500]
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Hierarchical porous multi-phase Ni-Zn-Co oxide/hydroxide is synthesized by using metal-organic framework-5 (MOF-5) as the template. Hierarchical porous carbon is obtained by the facile direct decomposition of the MOF-5 framework with phenolic resin. The structures and textures are characterized by X-ray diffraction, high-resolution transmission electron microscopy, scanning electron microscopy, and nitrogen sorption at 77 K. An asymmetric capacitor incorporating the Ni-Zn-Co oxide/hydroxide as the positive electrode and the porous carbon as the negative electrode is fabricated. A maximum energy density of 41.65 Wh kg(-1) is obtained, which outperforms many other available asymmetric capacitors. The asymmetric capacitor also shows a good high-rate performance, possessing an energy density of 16.62 Wh kg(-1) at the power density of about 2900 W kg(-1). (c) 2009 Elsevier B.V. All rights reserved.
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